China Y&X Beijing Technology Co., Ltd. Company News

  1. Grinding Fineness Test The exposure of monomer gold or bare gold surface is a prerequisite for cyanide leaching or new non-toxic leaching methods. Increasing the grinding fineness appropriately can enhance the leaching rate. However, over-grinding not only raises milling costs but also increases the likelihood of leachable impurities entering the leach solution, leading to the loss of cyanide or leaching agents and dissolved gold. To determine the appropriate grinding fineness, a grinding fineness test must be conducted first.   2. Pretreatment Agent Selection Test Gold ore leaching often requires pretreatment agent selection tests. Common agents like calcium peroxide, sodium hypochlorite, sodium peroxide, hydrogen peroxide, citric acid, and lead nitrate are compared with conventional methods where no pretreatment agent is used, aiming to determine if pretreatment is necessary. Calcium peroxide, sodium hypochlorite, and sodium peroxide are stable and widely used multifunctional inorganic peroxides, characterized by prolonged oxygen release, which helps improve gold leaching rates in leach slurry. Hydrogen peroxide and citric acid supply sufficient oxygen during the leaching process as the main oxygen-generating agents. Lead nitrate’s lead ions (in appropriate amounts) can destroy the passivation film on gold during cyanide leaching, speeding up gold dissolution, reducing cyanidation time, and increasing the leaching rate.   3. Protective Alkali and Lime Dosage Test To stabilize the sodium cyanide solution or non-toxic leaching agents and minimize chemical losses, a suitable amount of alkali must be added to the leach to maintain a certain slurry alkalinity. Within a certain range, as alkali concentration increases, the gold leaching rate remains constant while the leaching agent dosage decreases accordingly. However, excessive alkalinity slows gold dissolution and reduces the leaching rate, necessitating determining the optimal alkali dosage and slurry pH. In tests and production, widely available and low-cost lime is usually used as the leaching protective alkali. This helps determine the specific dosage needed for practical production.   4. Leaching Agent Dosage Test In the gold leaching process, the leaching agent dosage is directly proportional to the gold leaching rate within a certain range. However, excessively high dosages not only raise production costs but also have little impact on further increasing the leaching rate. Therefore, based on the grinding fineness test, a leaching agent dosage test is conducted to determine the optimal dosage, further lowering agent consumption and production costs.   Click here to get more details of low-toxic cyanide alternative YX500!      5. Leaching Time Test To achieve high leaching rates, extending leaching time is a common practice, allowing complete gold dissolution and maximizing leaching efficiency. As leaching time increases, the gold leaching rate gradually rises until it stabilizes. However, prolonged leaching time also dissolves and accumulates other impurities in the slurry, hindering gold dissolution. A leaching time test is conducted to determine the optimal duration. 6. Slurry Concentration Test During leaching, the slurry concentration directly affects the gold leaching rate and speed. Higher concentrations result in higher viscosity and lower fluidity, reducing both the gold leaching rate and speed. Conversely, too low a concentration increases leaching efficiency but also necessitates larger equipment and higher investment, while proportionally increasing reagent dosages and production costs. A slurry concentration test is conducted to determine the optimal leach slurry concentration.   7. Activated Carbon Pretreatment Test For the carbon-in-leach (CIL) method, hard and wear-resistant activated carbon must be used to avoid fine carbon particles entering the tailings due to abrasion during stirring, leading to gold loss and reduced recovery rates. The test typically uses coconut shell activated carbon with a particle size of 6-40 mesh. The pretreatment conditions involve a water-to-carbon ratio of 5:1, stirring for 4 hours at 1700 RPM. The carbon is then screened using 6-mesh and 16-mesh sieves, removing fine particles below 16 mesh. The selected carbon (6-16 mesh) is used for carbon leaching and adsorption tests.   8. Base Carbon Density Test In gold ore leaching tests, 6-16 mesh coconut shell activated carbon is usually selected to adsorb and recover dissolved gold, yielding gold-loaded carbon, which is then subjected to mature carbon desorption and electrowinning to produce finished gold. The base carbon density directly impacts adsorption efficiency. A base carbon density test is conducted to determine the optimal density.   9. Carbon Adsorption Time Test To determine the appropriate carbon leaching (adsorption) time and minimize wear on gold-loaded carbon, a pre-leaching and carbon leaching (adsorption) time test is needed after determining the total leaching time.   10. Comprehensive Carbon Leaching Process Test To verify the stability of the carbon leaching process and the reproducibility of test results, a comprehensive parallel test of the entire carbon leaching process is conducted. After determining the optimal conditions in the above nine tests, the final integrated validation test is performed. This completes a full-scale test study for carbon slurry leaching in gold ore processing. Depending on actual production needs, additional tests may include tailings (barren solution) recycling trials or measuring carbon leaching residue settling rates.   Y&X Beijing Technology Co., Ltd. is a dedicated provider of beneficiation solutions for metal mines, specializing in efficient and environmentally friendly reagents. With extensive experience in copper, molybdenum, gold, silver, lead, zinc, nickel, magnesium, rare metals like cobalt and palladium, and non-metallic ores like bismuth, fluorite, and phosphate, we offer customized solutions tailored to the specific nature of your ore and production conditions. Our goal is to ensure maximum benefits for our customers through advanced beneficiation methods and high-efficiency reagents. Y&X is committed to providing one-stop beneficiation solutions and looks forward to a successful partnership with you.  

Flotation reagents play a crucial role in mineral processing, helping to regulate and control the flotation behavior of minerals. The most common reagents include collectors, frothers, regulators, and depressants. Below is a detailed overview of some frequently used flotation reagents:   1. Collectors Collectors enhance the hydrophobicity of mineral surfaces, increasing the attachment of mineral particles to air bubbles during flotation.   Xanthates Chemical Properties: Xanthates are salts of dithiocarbonates, commonly including ethyl xanthate (C2H5OCS2Na) and isopropyl xanthate (C3H7OCS2Na). Features: Strong collecting power but low selectivity, mainly used for sulfide minerals. Applications: Suitable for the flotation of copper, lead, and zinc ores. Data: In copper flotation, the dosage of ethyl xanthate ranges from 30-100 g/t, with recovery rates exceeding 90%.   Click here to know more: Dithiophosphates Chemical Properties: Dithiophosphates are salts of dithiophosphoric acid, such as sodium diethyl dithiophosphate (NaO2PS2(C2H5)2). Features: Good balance between selectivity and collecting power, effective for sulfide ores of copper, lead, and zinc. Applications: Used in the flotation of gold, silver, and copper ores. Data: In gold ore flotation, dithiophosphates are applied at 20-80 g/t, achieving recovery rates above 85%.   Carboxylates Chemical Properties: Carboxylates contain carboxylic acid groups, such as sodium oleate (C18H33NaO2). Features: Suitable for oxidized and non-metallic mineral flotation. Applications: Used in the flotation of hematite, ilmenite, and apatite. Data: In apatite flotation, sodium oleate is applied at concentrations of 50-150 g/t, with recovery rates around 75%.   2. Frothers Frothers promote the formation of stable and uniform bubbles during flotation, aiding in the attachment and separation of mineral particles.   Pine Oil Chemical Properties: Composed mainly of terpene compounds, offering excellent frothing capability. Features: Strong frothing ability with good bubble stability. Applications: Widely used for both sulfide and non-metallic minerals. Data: In copper flotation, pine oil dosage is typically 10-50 g/t.   Butanol Chemical Properties: An alcohol compound with moderate frothing properties. Features: Provides balanced frothing ability with stable foam. Applications: Suitable for the flotation of copper, lead, and zinc minerals. Data: In lead flotation, butanol is used at 5-20 g/t.   Click here to know more:   Y&X’s frother Q80 is characterized by several key features that make it an attractive choice for mineral processing: MIBC Substitute: It serves as a practical replacement for MIBC, commonly used in the industry. Non-Hazardous: Its non-hazardous nature ensures a safer working environment and easier compliance with regulatory standards.   3. Regulators Regulators adjust the pH of the slurry, inhibit or activate mineral surfaces, enhancing flotation selectivity.   Lime Chemical Properties: Mainly composed of calcium hydroxide (Ca(OH)2), used to control slurry pH. Features: Can adjust slurry pH to a range of 10-12. Applications: Extensively used in the flotation of copper, lead, and zinc ores. Data: In copper flotation, lime is applied at concentrations of 500-2000 g/t.   Copper Sulfate Chemical Properties: Copper sulfate (CuSO4) is a strong oxidizer commonly used as an activator for sulfide minerals. Features: Exhibits significant activation effects, particularly for pyrite flotation. Applications: Used in the activation of copper, lead, and zinc ores. Data: In lead flotation, copper sulfate is used at 50-200 g/t.   Click here to know more: 4. Depressants Depressants suppress the flotation activity of certain minerals, enabling selective separation.   Sodium Silicate Chemical Properties: Sodium silicate is a compound containing silicates with dispersing and inhibiting properties. Features: Effectively inhibits gangue minerals. Applications: Applied in the flotation of copper, lead, and zinc ores to depress gangue minerals. Data: In copper flotation, sodium silicate is used at concentrations of 100-500 g/t.   Sodium Sulfide Chemical Properties: Sodium sulfide (Na2S) is a strong reducing agent commonly used to depress oxidized minerals. Features: Highly effective in suppressing oxidation in copper minerals. Applications: Used in the flotation of oxidized copper, lead, and zinc minerals. Data: In oxidized copper flotation, sodium sulfide is applied at 50-150 g/t.   Flotation reagents come in many varieties, each with specific chemical properties and applications. Selecting and combining suitable reagents can significantly enhance flotation efficiency and product quality. Practical application requires choosing the optimal reagents and dosages based on ore characteristics, process requirements, and economic considerations.   Y&X Beijing Technology Co., Ltd. specializes in efficient, eco-friendly reagents for metal and non-metal ore beneficiation. With extensive experience in ores like copper, molybdenum, gold, silver, lead, zinc, nickel, magnesium, cobalt, palladium, bismuth, fluorite, and phosphate, we offer customized, advanced solutions to maximize your benefits. Committed to providing one-stop beneficiation services, we look forward to a successful partnership with you.  

Heap leaching is a common method for gold extraction from ores, and the properties of the raw ore, including its mineralogical characteristics, associated minerals, and particle size distribution, significantly impact the efficiency of the heap leaching process.   1. Mineralogical Characteristics The raw material used in heap leaching consists of large ore blocks stacked on a pad. The leaching solution penetrates the ore surface, pores, and cleavage planes to contact and dissolve the gold. Therefore, ores with high porosity and well-developed cleavage facilitate the leaching process. Dense primary ores, however, are difficult to treat with heap leaching. In contrast, oxidized ores, which have undergone weathering, tend to become porous and permeable, making them more suitable for heap leaching.   Finer gold particles exhibit faster leaching rates, but these must be exposed for effective leaching. Coarser gold particles require longer leaching times, and their recovery rates are typically lower, making them less ideal for heap leaching. The shape of the gold particles also plays a crucial role; thin, exposed flakes leach more rapidly, whereas coarse, rounded particles leach more slowly. Gold particles with open pores on their surface leach more efficiently.   2. Associated Minerals The various mineral components within the ore influence the leaching process to different extents. Minerals that react with cyanide and oxygen in the leaching solution, or those that adsorb on the surface of gold particles, can hinder gold leaching by consuming cyanide and oxygen or purifying the gold surface.   Iron sulfide minerals, such as pyrite, marcasite, and pyrrhotite, can react chemically with cyanide and oxygen in the leaching solution, consuming these reagents. Intermediate products from these reactions also deplete the available oxygen and cyanide.   Arsenic-bearing minerals like arsenopyrite, realgar, orpiment, and arsenic trioxide can similarly react with oxygen and cyanide, reducing the effective chemical components in the leaching solution.   Copper and zinc minerals also react with cyanide, leading to its consumption. Antimony minerals may form deposits on gold particles, obstructing the leaching process. Excessive calcium oxide, used as a protective alkali, can form calcium peroxide on gold surfaces at high pH levels, further inhibiting leaching.   Ores containing carbonaceous minerals can adsorb the dissolved gold, leading to losses in the heap and reducing the overall gold recovery.   3. Ore Particle Size From a kinetic perspective, smaller particle sizes increase the exposed surface area of gold particles, enhancing contact between the solid and liquid phases and accelerating the leaching process.   However, overly fine particles can slow down the percolation rate of the leaching solution, negatively affecting the solid-liquid separation within the heap. In extreme cases, fine particles can block the uniform flow of the leaching solution, creating dead zones that impair leaching efficiency. Fine particles can also complicate the washing process, leading to the loss of gold-bearing solutions and extending the leaching time.     Y&X's widely recognized product, YX500 gold leaching reagent, serves as an eco-friendly alternative to the highly toxic sodium cyanide, effectively overcoming nearly all of its disadvantages. YX500 is already in industrial production and application. The innovative "combined leaching" and "on-site cleaning" technologies developed by Y&X ensure that tailing pond sludge is discharged according to environmental standards while maintaining high gold recovery rates.   Key advantages of YX500 include: 1. Low toxicity and environmental friendliness, offering enhanced safety in transportation, use, and storage. 2. As a standard chemical product, YX500 can be shipped via sea, rail, or road, greatly reducing transportation costs. 3. It can directly replace sodium cyanide without requiring any modifications to existing leaching processes. 4. YX500 enables faster leaching than sodium cyanide, cutting production cycles by 30%, which saves labor, reduces costs, and conserves water. 5. It provides excellent stability and improved carbon adsorption capacity, significantly boosting the performance of activated carbon and increasing gold recovery rates.   Click here for more details on the YX500!    

The processing mineralogy of refractory gold ores reveals that the reasons behind the hindrance of cyanidation of gold are primarily due to the state of gold occurrence and the mineral composition. These reasons can be categorized into two major types: physical encapsulation and chemical interference.   What is Physical Encapsulation? Physical encapsulation refers to gold being finely disseminated or encapsulated in other primary minerals, making it highly dispersed and difficult to extract. The main host minerals encapsulating gold are pyrite and arsenopyrite, followed by sulfides of copper, lead, and zinc. While encapsulated gold is less commonly found in quartz and sulfates, its recovery from quartz and silicates remains economically unviable.   This type of refractory gold ore is the most significant and well-studied, with considerable research focused on finding effective solutions. Notably, the main host minerals such as pyrite and arsenopyrite, which encapsulate gold, are also key factors in causing chemical interference.   What is Chemical Interference? Chemical interference occurs when substances in the ore consume cyanide and oxygen or adsorb gold, thereby hindering the cyanidation process. Specific types of chemical interference include:   1. Sulphide Minerals: Various sulfide minerals in gold ores consume cyanide. 2. Oxygen-Consuming Minerals: Minerals that consume oxygen during decomposition. 3. Carbonaceous Materials: Substances that adsorb dissolved gold complexes, causing "preg-robbing" phenomena similar to activated carbon. 4. Protective Films: Minerals like arsenic, antimony, and lead that dissolve to form compounds or colloids, creating protective films on gold particles, hindering extraction. 5. Insoluble Compounds: Gold present in insoluble compounds or forms. 6. Passivation: Gold dissolution is passivated when in contact with other conductive minerals.   Among these, high-arsenic, high-sulfur, and high-carbon sulfide ores are the most common and challenging globally. Methods to Improve Refractory Gold Ore Treatment To enhance the treatment of refractory gold ores, several methods can be employed: 1. Mechanical Methods: Breaking down encapsulating materials to liberate gold. 2. Pretreatment Before Cyanidation: Oxidizing and decomposing primary minerals to release encapsulated gold and remove interfering components. Techniques include oxidative roasting, pressure oxidation, and bacterial oxidation. 3. Non-Cyanide Leaching Methods: Avoiding the adverse effects of interfering substances by using alternatives such as thiosulfate or thiourea leaching. 4. Enhanced Cyanidation: Improving the cyanidation process through methods like pressure cyanidation, addition of oxidants, or using chemicals to neutralize harmful components.   In recent years, the number of gold mines adopting these treatment technologies has increased rapidly. However, oxidative roasting, pressure oxidation, and bacterial pre-oxidation remain the most common methods in research and practical applications.   Y&X Beijing Technology Co., Ltd. specializes in efficient, eco-friendly beneficiation solutions for metal and non-metallic ores. With expertise in copper, molybdenum, gold, silver, lead, zinc, nickel, magnesium, cobalt, palladium, bismuth, fluorite, and phosphate, we tailor our advanced methods and high-efficiency reagents to your specific needs. Our goal is to maximize your benefits and provide comprehensive, one-stop solutions. We look forward to a successful partnership with you.

Process flow testing is generally conducted before the preliminary design of a beneficiation plant or the modification of existing technology. These tests provide a reference for the design or technical renovation of the plant. Typically, laboratory tests are conducted first, followed by planning based on the results to determine if semi-industrial or industrial tests are necessary.   The testing process for beneficiation procedures is usually developed by a research unit, which also collects the necessary data. If conditions allow, the testing, design, and production departments can collaborate to finalize the test details.   I. General Content of Data Collection before Beneficiation A. Understanding the Task and Client Requirements 1. Determine the scale and service life of the beneficiation plant. 2. Identify the main useful components and associated comprehensive utilization issues. 3. Outline the stages of testing and the required completion date. 4. Specify whether the plant will process ore from a single deposit or multiple deposits and types. 5. Note any special requirements for the chemical composition, grade, and particle size of the concentrate. 6. Analyze the supply and performance of water sources, beneficiation reagents, and roasting fuels in the plant area.   B. Geology-Related Information 1. Identify the type of deposit, geological reserves, orebody characteristics, ore types, grade features, mineralization patterns, and surrounding rock variations. 2. Perform a prospect evaluation and design a sampling strategy.   C. Mining Design Information 1. Outline mining development plans and methods. 2. Describe the co-mining or selective mining of different ore types. 3. Provide the rate of dilution and the grade of extracted ore. 4. Detail the ore type ratios and average grades for the designed mining area, and the planned ore type ratios and average grades for the next 5-10 years.   D. Beneficiation Information 1. Specify any special requirements for testing from the beneficiation design. 2. Review worldwide test research and production practices for similar ores. 3. Identify potential advanced technologies that could be applied.   II. Main Content of Beneficiation Process Flow Testing A. Ore Properties Research Understanding ore properties is crucial for selecting a beneficiation scheme and defining the plant design. This includes: 1. Spectroscopic qualitative and semi-quantitative analysis. 2. Comprehensive chemical analysis, mineral identification, phase analysis, size analysis, magnetic analysis, heavy liquid analysis, fire assay, grindability tests, and various physical properties (specific gravity, magnetic susceptibility, conductivity, moisture content, true and bulk densities, angle of repose, friction angle, hardness, viscosity, etc.).   B. Beneficiation Methods, Flow Structures, Indicators, and Process Conditions These aspects directly influence the plant design and must be carefully considered to ensure reliable beneficiation indicators. For complex ores or those with limited beneficiation practice, exploratory tests should precede the testing program. The program should include schemes based on successful production practices and new technologies with proven potential for practical application. Multiple testing schemes should be considered for technical and economic comparisons, with detailed analysis of 1-2 key flow schemes.   Process conditions should be optimized by identifying their influencing factors and determining the best range for key operations. The flow structure should include the number of grinding and separation stages, roughing, cleaning, and scavenging operations, and mass flow diagrams. Slurry flow diagrams should be provided if necessary.   C. Analysis of Beneficiation Outputs Various analyses (spectral, chemical, fire assay, phase, size, mineral identification) should be conducted on concentrate, middling, and tailings to address issues such as: 1. Low concentrate grade, low recovery rates, unmet chromite/manganese ratios. 2. Enrichment directions of certain co-occurring elements. 3. The performance of certain beneficiation operations and new technologies for different minerals.   Output properties like chemical composition, size characteristics, true and bulk densities, and sedimentation rates of concentrate and tailings are fundamental data for plant design.   D. Special Test Items Special test items may be required based on user and design unit requests, such as flotation with recycled water, purification of beneficiation wastewater, filtration of flotation concentrate, utilization of off-spec ore, and supplementary tests after production trials.   III. Research on Beneficiation Methods and Process Testing 1. Research on Beneficiation Methods: Due to advances in beneficiation technology, multiple methods may be available for treating a single ore type. Comparative testing of different methods should be conducted based on ore properties, product quality requirements, and construction conditions to select the most suitable method.   2. Separation Condition Testing: Flotation: Tests should include grinding fineness, slurry concentration, temperature, pH, reagent regime, stirring, and flotation time. Additional tests may cover recycled water use, water quality, reagent removal, desliming, air pressure, and air volume. Magnetic Separation: Tests should include magnetic induction intensity, material entry particle size, capacity, classification versus non-classification. For dry weak magnetic separation, additional tests on the impact of ore moisture and washing on separation indicators are needed. For wet strong magnetic separation, tests should cover slurry concentration, washing water pressure and volume, medium plate gap, rotation speed, and the aggregation of strongly magnetic minerals. Gravity Separation: Tests should include feed quantity, particle size and range, slurry concentration (solid-liquid ratio), washing water pressure and volume, feed and discharge methods, and cut-off position. Specific equipment parameters should also be tested. Comparison Tests of Major Raw Materials for Mineral Processing Reagents, Fuels, and Media: These tests should be conducted in conjunction with different mineral processing methods and equipment trials. They involve comparing the types, performance, specifications, consumption, and beneficiation effects of the main reagents, fuels, and media used. The goal is to select varieties that offer good beneficiation indicators, are cost-effective, have abundant sources, and cause minimal environmental pollution or are easy to manage.   Y&X Beijing Technology Co., Ltd. is a dedicated provider of beneficiation solutions for metal mines, specializing in efficient and environmentally friendly reagents. With extensive experience in copper, molybdenum, gold, silver, lead, zinc, nickel, magnesium, rare metals like cobalt and palladium, and non-metallic ores like bismuth, fluorite, and phosphate, we offer customized solutions tailored to the specific nature of your ore and production conditions. Our goal is to ensure maximum benefits for our customers through advanced beneficiation methods and high-efficiency reagents. Y&X is committed to providing one-stop beneficiation solutions and looks forward to a successful partnership with you.  

Contents: What Is Flocculant? What Makes Polyacrylamide Flocculant Effective? When Should We Use Flocculant? How Is Flocculant Applied? Why Is Flocculant Important? Conclusion   What Is Flocculant? Flocculant is a crucial reagent in the wastewater treatment industry, designed to aid in the aggregation and removal of suspended particles from liquids through the process of flocculation. Among these, polyacrylamide flocculant stands out due to its water-soluble polymer nature, which is not soluble in most organic solvents. This characteristic makes it highly effective in flocculation processes. Polyacrylamide flocculant possesses exceptional flocculation properties, which are beneficial across various applications including mining tailings treatment, urban wastewater management, and sludge dewatering.   What Makes Polyacrylamide Flocculant Effective? Polyacrylamide flocculant works by neutralizing the charges on suspended particles in wastewater, causing them to clump together into larger aggregates, or "flocs," through flocculation. These flocs then settle out of the liquid, facilitating their removal. The effectiveness of this flocculant is attributed to its high molecular weight and unique ionic properties, which can be non-ionic, anionic, cationic, or amphoteric. Each type is suited to specific treatment needs, depending on the nature of the wastewater and the particles involved. When Should We Use Flocculant? Flocculant should be used when there is a need to remove suspended particles from wastewater efficiently. It is particularly useful when dealing with high volumes of suspended solids or when the particles are difficult to settle by gravity alone. The timing of flocculant addition is critical; it is often introduced after primary treatment stages where large debris is removed, but before final clarification and filtration stages. In processes where rapid settling and clear separation of solids and liquids are required, flocculant plays a vital role. It is also essential during sludge dewatering to improve the consistency and reduce the volume of sludge.   How Is Flocculant Applied? Flocculant can be applied through several methods, including direct addition to wastewater, incorporation into belt filter presses for sludge dewatering, and dosing systems. The choice of application method depends on the specific requirements of the treatment process and the type of wastewater being treated. Proper mixing and dosing are essential to achieve optimal flocculation and ensure that the flocculant performs effectively.   Where Is Flocculant Used? Flocculant finds its applications in diverse environments across multiple industries. It is integral in mining operations for treating tailings, in municipal wastewater facilities for treating urban sewage, and in industrial settings for managing wastewater from various manufacturing processes. Its versatility makes it suitable for a broad range of applications including paper mill wastewater, textile dyeing, automotive spraying, and stone factory wastewater treatment.   Why Is Flocculant Important? The importance of flocculant in wastewater treatment lies in its ability to enhance the efficiency of the treatment process through effective flocculation. By facilitating the aggregation and removal of suspended particles, flocculant improves the clarity of the treated water and reduces the environmental impact of wastewater discharge. Its use helps in meeting regulatory standards for water quality and promotes sustainable practices in various industries.   Polyacrylamide flocculant from Y&X offers reliable and efficient flocculation for wastewater treatment. Its special formulation ensures effective aggregation and removal of suspended particles, making it suitable for various industries, including mining and wastewater management. With Y&X’s extensive experience and commitment to quality, our flocculant helps achieve cleaner, clearer water and promotes sustainable practices.     Conclusion Polyacrylamide flocculant is a vital component in the wastewater treatment process, offering significant benefits across multiple applications. Its ability to improve flocculation efficiency and adapt to different ionic conditions makes it indispensable in managing and treating wastewater effectively.

  The method of extracting gold from ores is determined by the type and properties of the ore. Generally, gold ores are categorized into two types based on their adaptability to cyanidation: easily leachable ores and difficult-to-leach ores. Difficult-to-leach gold ores are those that cannot be effectively leached using conventional cyanidation methods, even after fine grinding. Some authors define difficult-to-leach gold ores as those with a cyanide leaching recovery rate of less than 80% after fine grinding. In English, "refractory gold ores" can also be translated as "difficult-to-process gold ores," "difficult-to-leach gold ores," or "recalcitrant gold ores," but the term "difficult-to-leach gold ores" is the most accurate based on its definition.     There are multiple reasons why some gold ores are difficult to leach, encompassing physical, chemical, and mineralogical factors. These reasons can be summarized into five main categories:   1. Physical Encapsulation: Gold particles are often finely disseminated or submicroscopic within sulfide minerals (such as pyrite, arsenopyrite, and pyrrhotite) or silicate minerals (like quartz). They can also be present within the crystal lattice of sulfide minerals. Such encapsulated gold is difficult to liberate even with fine grinding, preventing contact with cyanide during the leaching process.   2. Consumption of Oxygen and Cyanide by Other Minerals: Ores often contain sulfide and oxide minerals of metals such as arsenic, copper, antimony, iron, manganese, lead, zinc, nickel, and cobalt. These minerals have high solubility in alkaline cyanide solutions, consuming significant amounts of cyanide and dissolved oxygen, and forming various cyanide complexes and thiocyanate (SCN-). This negatively affects the leaching process. The most important oxygen-consuming minerals are pyrrhotite, marcasite, and arsenopyrite, while the most significant cyanide-consuming minerals are arsenopyrite, chalcopyrite, bornite, stibnite, and galena.   3. Surface Passivation of Gold Particles: During ore oxidation, the surface of gold particles in contact with cyanide pulp may form films such as sulfide films, peroxide films (e.g., calcium peroxide film), oxide films, and insoluble cyanide films. These films cause surface passivation of gold, significantly reducing the oxidation and leaching rates of gold particles. When sulfide minerals are present in the ore, the dissolution of gold can be hindered in various ways. One explanation is that soluble sulfides (S2- or HS-) produced by mineral dissolution can react with gold to form a sulfide film, passivating the gold surface. Another theory is that a dynamic reduction couple forms on the sulfide surface, leading to the formation of a dense cyanide complex film on the gold particles, thus passivating them.     4. "Robbing" Effect by Carbonaceous Materials: Ores often contain carbonaceous materials (such as activated carbon, graphite, and humic acid) and clays that can adsorb gold. These materials can preferentially adsorb gold-cyanide complexes during cyanide leaching, causing a "robbing" effect, which results in gold losses in the cyanide tailings and severely impacts gold recovery.   5. Presence of Insoluble Gold Compounds: In some ores, gold exists in the form of tellurides (such as calaverite, sylvanite, and krennerite), solid solution silver-gold minerals, and other alloys that are slow to react in cyanide solutions. Additionally, minerals such as aurostibite, black bismuthinite, and gold-humic acid complexes are also difficult to dissolve in cyanide solutions.   Y&X's popular product YX500 gold leaching reagent is an environmentally friendly alternative to the highly toxic sodium cyanide, effectively addressing nearly all of sodium cyanide's drawbacks. YX500 has already achieved industrial production and application. The developed "combined leaching" and "on-site cleaning" technologies ensure the standard discharge of tailing pond sludge while maintaining high gold leaching rates.   The main advantages of YX500 are: 1. Environmentally friendly with low toxicity, ensuring safer transportation, usage, and storage. 2. As a common chemical product, it can be transported by sea, rail, or road, significantly reducing transportation costs. 3. Can directly replace sodium cyanide without altering any existing leaching processes. 4. Offers faster leaching speed compared to sodium cyanide, reducing production cycles by 30%, saving labor, reducing costs, and conserving water. 5. Exhibits good stability and increased carbon adsorption capacity, effectively enhancing the adsorption capacity of activated carbon and increasing recovery rates.   Click here for more details on the YX500!    

On May 16, Zijin Mining released its "Five-Year Development Plan," setting a target to achieve its 2030 goals by 2028. The company aims to increase copper output by at least 49% to 1.5-1.6 million tonnes, gold production by 47% to 100-110 tonnes, and lithium carbonate equivalent production by 82 times to 250,000-300,000 tonnes. Meeting these targets would place Zijin Mining among the top three global copper producers and establish it as a major player in the lithium industry.   Rapid Growth and Strategic Vision Zijin Mining has seen remarkable growth over the past 30 years, ranking fifth in global copper production and seventh in gold production by 2023. The company has consistently exceeded its copper production guidance for five consecutive years.   In 2023, Zijin Mining revised its strategic goals based on three years of achievements and changes in the external environment, aiming to achieve comprehensive global first-class status by 2030. That year, the company's primary products continued to grow significantly, with copper production reaching 1.01 million tonnes, making it the only Asian company to exceed one million tonnes of copper production.   Key projects like the Kamoa Copper Mine in the Democratic Republic of Congo, the Julong Copper Mine in Tibet, and the Čukaru Peki Copper-Gold Mine in Serbia, along with aggressive acquisitions and over 30 million tonnes of deep porphyry copper resources mined using the cost-effective block caving method, underpin Zijin Mining's growth strategy.   In addition to copper, Zijin Mining plans to produce 85 tonnes of gold in 2025 and 100-110 tonnes by 2028. The company is also focusing on the growth of other metals such as lithium, molybdenum, and silver. Since 2021, Zijin Mining has rapidly secured significant lithium resources and advanced various projects to enhance its position in the lithium market.     Strategic Adjustments and Future Goals Zijin Mining has made tactical adjustments to its lithium sector, prioritizing cost control and technological innovation over rapid construction and production. The 2025 lithium production target has been revised to 100,000 tonnes, with a goal of 250,000-300,000 tonnes by 2028.   The company's strategic planning and execution capabilities are evident from the high completion rates of its production targets over the past decade. Zijin Mining's updated plan aims to achieve its major 2030 targets by 2028, establishing an advanced global operation management system and ESG sustainable development system, and becoming a "green, high-tech, first-class international mining group."   Chen Jinghe, Chairman of Zijin Mining, emphasized the importance of "improving quality, controlling costs, and increasing efficiency," along with proactive reform and innovation to continuously enhance metal resource reserves and production output.   Source: Zijin Mining Mineral processing chemicals Mineral processing equipment  

Five Types of Gold Ore and Their Flotation Methods   Gold ore types are categorized in various ways based on different criteria. According to the degree of ore oxidation, they can be classified into primary (sulfide) ores, partially oxidized (mixed) ores, and oxidized ores. Oxidized ores are characterized by the presence of iron oxide, other metal oxides, and clay minerals. Based on the practical conditions and the requirements of flotation processes, gold ores can be further classified into: low-sulfide gold ores, polysulfide gold ores, gold-bearing polymetallic ores, telluride gold-bearing ores, and gold-copper ores.   Low-Sulfide Gold Ores These ores are typically quartz vein types, including composite quartz veins and fine vein dissemination types, with low sulfide content primarily composed of pyrite. In some cases, they may also contain copper, lead, zinc, tungsten, molybdenum, and other minerals. The natural gold particles in these ores are relatively large, and gold is the main target for recovery, with other elements or minerals having little industrial value or being recoverable only as by-products. Simple flotation processes, such as single flotation or whole mud cyanidation, can achieve high recovery rates.   Telluride Gold-Bearing Ores In these ores, gold is predominantly found in its natural state, but a significant portion is present in gold tellurides. These ores are typically formed in low-temperature hydrothermal deposits, with gangue minerals being quartz, chalcedonic quartz, and carbonates. A combination of flotation and amalgamation processes is used to enhance gold extraction. Polysulfide Gold Ores These ores contain high amounts of pyrite or arsenopyrite, which are also recovery targets along with gold. The gold grade is relatively low and varies little, with natural gold particles being small and often encapsulated within pyrite. Flotation is used to separate gold and sulfides, which is relatively simple; however, separating gold from sulfides requires complex flotation and metallurgical processes to achieve high recovery rates. Gold-Bearing Polymetallic Ores In addition to gold, these ores may contain copper, lead, zinc, silver, tungsten, antimony, and other metallic minerals, all of which have independent mining value. These ores are characterized by a significant amount of sulfides (10-20%), with natural gold closely associated with pyrite and often with copper and lead minerals. The natural gold is unevenly distributed with varying grain sizes. The complexity of these ores necessitates the use of complex flotation processes to achieve effective separation.   Gold-Copper Ores The primary difference between these ores and gold-bearing polymetallic ores is the lower gold grade, although gold remains one of the key elements for comprehensive utilization. The natural gold particle size is medium, and the association between gold and other minerals is complex. During flotation, gold is often concentrated in the copper concentrate, from which it is recovered during the copper smelting process.   Extraction Methods for Gold Mining Although the cyanidation process is currently one of the most widely used methods for gold extraction, the development of technology has led to the creation and application of more safe and efficient alternatives. Choosing the appropriate extraction method requires considering the characteristics of the ore, safety requirements, and environmental impacts.   Y&X's popular product YX500 gold leaching agent is an environmentally friendly alternative to the highly toxic sodium cyanide, effectively addressing nearly all of sodium cyanide's drawbacks. YX500 has already achieved industrial production and application. The developed "combined leaching" and "on-site cleaning" technologies ensure the standard discharge of tailing pond sludge while maintaining gold leaching rates.   The main advantages of YX500 are: 1. Environmentally friendly, low toxicity, safer transportation, usage, and storage. 2. As a common chemical product, it can be transported by sea, rail, or road, reducing transportation costs. 3. Can directly replace sodium cyanide without altering any existing leaching processes. 4. Faster leaching speed compared to sodium cyanide, reducing production cycles by 30%, saving labor, reducing costs, and conserving water. 5. Good stability and increased carbon adsorption capacity, effectively enhancing the adsorption capacity of activated carbon and increasing recovery rates.   Click here for more details on the YX500!

  Maximizing Flotation Efficiency: The Power of Sulfide Activators, Spotlight on Copper Sulfate   To improve the selectivity of the flotation process, enhance the effects of collectors and frothers, reduce the mutual inclusion of valuable mineral components, and improve the conditions of the flotation pulp, modifiers are often used in the flotation process. Modifiers in the flotation process include many reagents, and according to their roles in the flotation process, they can be divided into depressants, activators, pH regulators, defoamers, flocculants, dispersants, etc.   Activators in Flotation Processes Activators are a type of flotation reagent that can enhance the ability of mineral surfaces to adsorb collectors. The mechanisms of activation include: 1. Forming an insoluble activation film on the mineral surface that easily reacts with collectors; 2. Creating active sites on the mineral surface that easily react with collectors; 3. Removing hydrophilic films from the mineral surface to improve the floatability of the mineral surface; 4. Eliminating metal ions in the pulp that hinder the flotation of target minerals.   Properties of Sulfide Activators Compounds of divalent sulfur, such as metal sulfides, can be considered salts of hydrogen sulfide. Metal sulfides can be produced by the direct reaction of metals with sulfur, by passing hydrogen sulfide gas into a metal salt solution, or by adding sodium sulfide to a salt solution.   Alkali metal sulfides and ammonium sulfide are easily soluble in water, and due to hydrolysis, their solutions are alkaline. The sulfides of alkaline earth metals, scandium, yttrium, and lanthanides are relatively insoluble. When the outer electron configuration of cations is 18-electron or 18+2-electron, strong polarization often results in the formation of insoluble, colored sulfides. Most water-insoluble sulfides can dissolve in acids, releasing hydrogen sulfide. A few extremely insoluble metal sulfides (such as CuS and HgS) can be dissolved using oxidizing acids, where sulfur is oxidized and precipitates from the solution. Insoluble metal sulfides exist in a dissolution-precipitation equilibrium in solution. By controlling the acidity of the solution, the concentration of S2- ions in the solution can be altered, allowing the precipitation of different insoluble metal sulfides with varying solubilities. This principle is the basis for using hydrogen sulfide to separate and identify metal ions in qualitative analysis.     Applications of Sulfide Activators In the flotation process, sodium sulfide, sodium hydrosulfide, calcium sulfide, and other sulfides are commonly used as activators to activate non-ferrous metal oxide minerals. The common characteristic of these sulfides is their ability to dissociate sulfur ions in the pulp, which can react with metal ions on the surface of non-ferrous metal oxide minerals to form sulfide films that easily interact with xanthate collectors. This enhances the floatability of non-ferrous metal oxide minerals.   Copper Sulfate (CuSO4) for Flotation of Sulfide Ores Among these activators, copper sulfate (CuSO4) is one of the most widely used reagents in the flotation of sulfide ores, effectively activating minerals such as sphalerite, antimonite, pyrite, and pyrrhotite. It is especially effective for activating sphalerite that has been suppressed by lime or cyanide. Suitable for mining flotation processes, copper sulfate is widely used for sulfide ores. It comes in blue crystal form, is soluble in water and free of impurities, and Y&X’S CuSO4 is packed in 1000 kg bags with customizable logos. The minimum order quantity is 1 ton. Copper sulfate is a crucial reagent in the flotation process, ensuring optimal recovery of valuable sulfide minerals.   Click here for more information about CuSO4