Mining Chemicals
Depressants and dispersants

In mineral flotation the challenge is to maximize the recovery of desired minerals while rejecting unwanted gangue components.

Depressants are required to give a low affinity to active sites on valuable mineral surfaces and a high affinity for gangue minerals and some sulfides. Typically, depressants prevent collector adsorption or bubble attachment to unwanted mineral surfaces. This increases the selectivity of flotation, rendering certain minerals hydrophilic and preventing them floating to the surface.

 

Sulfide depressants

UNIMAX® SD200

Iron sulfide (pyrite, pyrrhotite, marcasite) depressant used in the flotation separation of base metal sulphides. Also used as an alternative partial cyanide replacement to depress iron and zinc sulfides in Pb / Zn flotation.

UNIMAX® SD210

Iron sulfide (pyrite, pyrrhotite, marcasite) depressant used in the flotation separation of base metal sulfides. Alternative partial cyanide replacement to depress iron and zinc sulfides in Pb / Zn flotation.

UNIMAX® SD300

A specialty depressant for pyrite gangue, sphalerite and pyrrhotite in lead and copper flotation systems.

Diethylenetriamine (DETA)

DETA is a polyamine used as a depressant for pyrrhotite and arsenides in copper and nickel mineral flotation.

Triethylenetetramine (TETA)

Higher ethyleneamines, such as TETA can also be used as a depressant for pyrrhotite and arsenides in copper and nickel mineral flotation.

 
Carbonaceous gangue depressant

POLYMAX® G30

POLYMAX G30 is a preg-robbing / carbon depressant designed for use in gold beneficiation processes (CIP leaching). Blanks graphitic or carbonaceous gangues, preventing them from binding to gold in solution.

 

Dispersing reagents are surface charge modifiers. When processing complex ores their purpose is to prevent aggregation of fine and gangue particles. The dispersant controls the charge density at the solid-liquid interface or the electrical charges of fine and ultrafine particles so they remain as discrete, stabilized particles in solution. By selectively targeting gangue surfaces and rendering them hydrophilic (water-avid), gangue is therefore less likely to float or be entrained in the froth phase.

 

POLYMAX® T10

For use in dispersing MgO and talc gangues, silicates and clays. Effective in improving the recovery of fines.

POLYMAX® T12

Where lower solubility is required in dispersing MgO and talc gangues, silicates and clays. Effective in improving the recovery of fines

POLYMAX® K50

Dispersant designed to improve rejection of clays (e.g. Kaolinite) in sulfide flotation.

POLYMAX® K55

  

Dispersant designed to improve rejection of clays in sulfide flotation.

 

Our technical team is continually developing new reagents for use in other depressant applications. Contact our customer service department for the latest updates and information.