Tungsten Ore Flotation Inhibitor – Lignin

In tungsten ore flotation inhibitor, organic inhibitor can be divided into macromolecule inhibitor and micromolecule inhibitor. In recent years, organic inhibitor has diverse structure, has good selectivity of minerals, is also environmental friendly. Characteristic of organic inhibitor is concentration, it has special effect for gangue.

Lignin is aromaticity high polymer exists in plant, it exists in the xylem of plant to tramsport water and structure of mineral, xylem maintains high hardness to support the whole plant.

Lignin used for flotation is usually processed by sulfonation, vulcanization, chlorination, alkali treatment, etc., can achieve water-soluble sulfonated lignin, chlorinated lignin, alkali lignin and other processed products. In industry field,lignin is mostly used in the form of lignin sulfonate, in the tungsten ore flotation process, sodium sulfonate is more often used.

Chemical formula of sodium sulfonate is C12H25SO3Na, it is white or light yellow crystal powder, soluble in hot water, soluble in hot ethanol, insoluble in cold water, petroleum ether, anionic surfactants, with excellent penetration, washing, wetting, decomtamination and emulsification function.

Use lignin sodium sulfonate as inhibitor has high affinity toward carbonate minerals. So during tungsten concentrate flotation, it has good effect in inhibiting carbonate mineral which is slightly soluble.

Research shows that in tungsten ore flotation, when pH value is 11, lignin sodium sulfonate has the strongest inhibiting function for gangue.

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