(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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The product of the xanthate on the mineral surface is determined by the electrode potential of the mineral in the xanthate solution. When the surface electrostatic potential of the mineral is greater than the oxidation of the xanthate to the redox potential of the xanthate, the surface product of the mineral is mainly xanthate, such as yellow. iron ore surface electrostatic potential (0.26)> xanthate oxidation-reduction potential (0.13), surface oxidation product is dixanthogen; mineral surface when the electrostatic potential is less than the oxidation of xanthate oxidation-reduction potential of dixanthogen, mineral surface to produce the xanthate-based surface electrostatic potential galena (0.06) <xanthate oxidation-reduction potential (0.13), galena surface lead product is xanthan.