Fine Carbon Mineral Suppression – What You Need to Know

In the flotation of non-ferrous sulfide ores, the presence of fine-grained carbonaceous minerals (such as graphite, organic carbon, and free carbon) is often regarded as a "poison" to the beneficiation process.
Not only do they adsorb significant amounts of collectors and frothers from the pulp—thereby increasing reagent costs—but, more critically, their naturally hydrophobic surfaces allow them to be mechanically entrained in the froth and enter the concentrate. This reduces the grades of valuable elements like copper, gold, and silver, severely impacting smelting recovery rates and corporate profitability. 
To address such challenges, the Y&X technical team—through repeated material adjustments and extensive experimentation—successfully developed the D486S carbon depressant, which is suitable for a wide range of non-ferrous and precious metal flotation applications.

This product is primarily used to depress fine-grained carbonaceous minerals such as graphite, organic carbon, and free carbon. It is widely applied in the flotation of non-ferrous and precious metal ores, including copper, gold, copper-gold, and lead-zinc. By selectively depressing graphite, organic carbon, and free carbon—rendering their surfaces highly hydrophilic—it prevents these carbonaceous materials from adsorbing reagents or competing with target minerals for flotation, coverage, or adsorption. This enables effective interaction between the target minerals and the collector, facilitating high-efficiency recovery, improving concentrate grade and recovery rates, and reducing the dosage of collectors and frothers.

Case:

• (1) In a copper mine in Sichuan, the grade of raw copper is 0.8% and the carbon content is 6%. By adding the inhibitor 400 g/T, the grade of copper concentrate is increased from 17% to 22%, and the recovery rate is increased from 85% to 91%, which greatly improves the profitability; 

• (2) In a gold mine, the raw ore contains about 2.8 g/T of gold and 3% of carbon. By adding 250 g/T of the inhibitor, the grade of gold concentrate is increased from 20 g/T to 45 g/T, the gold flotation speed is greatly improved, and the flotation process is reduced from five sweeps to three sweeps, which effectively reduces the power cost and has obvious economic benefits. 

Metal ores contain more carbon or aphanitic graphite, so this inhibitor can also be used.

Are you also facing challenges in achieving optimal flotation performance with high-carbon ores?