黄铁矿低碱介质高效有机抑制剂的选择及其机理研究

Study on Selection and Mechanism of Effective Organic Depressants of Pyrite in Low Alkaline Medium

考察了几种有机药剂CMC、单宁酸、EDTA、腐殖酸钠对黄铁矿与黄铜矿浮选行为的影响 ,研究发现 :这些药剂对黄铜矿的浮选行为影响不大 ,但对黄铁矿浮选行为的影响各不相同 ,EDTA对黄铁矿的抑制作用不明显 ;CMC和单宁酸对黄铁矿的抑制作用与矿浆pH值有关 ;腐殖酸钠在较宽的矿浆pH值范围表现出对黄铁矿优异的抑制性能。对腐殖酸钠的进一步研究表明 :当矿浆中有Ca2 + 存在时 ,可强化腐殖酸钠对黄铁矿的抑制作用 ,而不影响黄铜矿的可浮性。并从矿物接触角与矿表黄药吸附量的变化角度分析了黄铁矿受抑制的机理。

The effect of several organic compounds such as CMC、tannic acid、EDTA and sodium humate on floatation behaviour of pyrite and chalcopyrite was investigated with pure minerals.The test results showed that these organic compounds had no influence on floatation behaviour of chalcopyrite,but had different influence on floatation behaviour of pyrite,especially sodium humate could be an effective depressant of pyrite.Further studies showed that sodium humate could increase its function at the presence of Ca 2+ .To analyze these mechanism,contact_angle measurements and collector absorption experiments of pyrite and chalpyrite were conducted,too.