What is the role of sodium silicate in flotation?
The inhibitory effect of sodium silicate on the silicate gangue minerals is mainly due to the action of hydrated silica produced after hydrolysis, and its mechanism is similar to that of water glass. It restraining force is stronger than the silica water glass, after hexametaphosphate, sodium phosphate. Sodium silicate (Na2SiF6) is a white crystal, slightly soluble in water, and decomposed into silicic acid and sodium fluoride by strong alkali. If the alkali is excessive, silicate is formed, which is commonly used to inhibit quartz, feldspar , serpentine, etc. Silicate minerals. When oleic acid flotation, it is possible to suppress garnet, monazite, tourmaline and the like; amines as collector when a small amount of sodium silicate can fluoro quartz, feldspar, tantalum and niobium activated iron ore, a large amount so that the They are inhibited; in the flotation of sulfide ore, sodium silicate can activate pyrite suppressed by lime; it can also act as an inhibitor of apatite. The inhibitory effect of sodium silicate on the silicate gangue minerals is mainly due to the action of hydrated silica produced after hydrolysis, and its mechanism is similar to that of water glass. It has a stronger inhibitory effect on quartz than water glass, second only to sodium hexametaphosphate. The activation of the sodium silicate by the lime-reduced pyrite is due to the fact that the F which is dissociated after hydrolysis precipitates Ca2+ which inhibits the pyrite, thereby activating pyrite. Kunshan Muchun Electric Co., LTD , https://www.muchunmanufacture.com