(1) Mechanism of action with galena:
1 The surface of the sulfide ore is oxidized to form thiosulfate and sulfate under aerobic conditions; PbS+2O2≒PbS04
2 Surface thiosulfate and sulfate are replaced by carbonate replacement PbSO4+CO32- ≒PbCO3+SO42-
3 Surface lead carbonate, lead sulfate and lead thiosulfate exchange and adsorption with xanthate anion PbS+2X-+1/2O2+2H+→PbX2+S0+H2O
Lead is more stable than lead carbonate, lead sulfate and lead thiosulfate under normal flotation conditions of pH=8-9, so xanthate anions are adsorbed on the surface of galena by displacement substitution of these lead salts. .
(2) Mechanism of action with pyrite:
2ROCSS- + 1/2O2+2H+ → (ROCSS)2+H2O on the surface of pyrite
The above redox reaction is generated on the surface of the sulfide ore, and the sulfide ore has a catalytic effect on the reaction, and the xanthate formed by the reaction is adsorbed on the surface of the sulfide ore.
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