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Depressants make it possible to increase final recovery consistently without sacrificing concentrate grade. They can either depress the effect of hydrophobic gangue minerals in the ore that would otherwise report with the froth along with the desired mineral or hold down the desired mineral while floating the undesirable gangue.

Solvay has developed highly efficient and versatile sulfide mineral depressants in diverse applications.  In the Cu-Mo separation system, the AERO® brand of depressants assist in the depression of copper and iron sulfides at lower dosages than traditional depressants such as NaHS and Nokes reagent. 

Other applications of depressants include the flotation of simple metal sulfide and complex polymetalic bearing ores, where we provide products that depress iron sulfides such as pyrite and marcasite.  Solvay also offers products for the depression of magnesium silicates such as talc, pyrophyllite, serpentines, olivines and pyroxenes.