Applications
Depressant
Dispersant
Grinding Aid
Pigments (TiO2)
Wastewater Treatment
Recommended products:
Liquid Sodium Silicate
How it works: Sodium silicate is a well-known
depressant for minerals such as calcite, fluorite, barite,
quartz, and other silicates. In flotation operations, sodium silicate keeps
these undesirable gangue particles in the water phase while the desirable value
particles are carried to the surface by air bubbles. A silicate dosage of 2-11
pounds per ton of ore is required for this application.
Silicate is also an important dispersant and
grinding aid, especially in sulfide ore
flotation. It provides more efficient separation of the value from the gangue,
and therefore can lead to higher grades and recoveries. Dosage must be
determined experimentally but may be on the order of 0.1-1.0 pounds per ton ore.
For TiO2 pigment applications, adding silicate to
an acidic slurry of TiO2 results in the formation of silica gel on
the particle surfaces. This precipitated coating protects the TiO2
from UV light that would otherwise discolor it.
See Water Treatment section for information
on treating wastewater.
Recommended Literature:
The Reemergence of Sodium Silicate as a Dispersant in Sulfide Mineral Flotation
Dispersion Characteristics of Sodium Silicates
Interactions of Aqueous Metal Silicates with Mine Water
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