碱性介质中有机抑制剂对黄铁矿和黄铜矿的抑制性能及作用机理

MECHANISM AND DEPRESSION BEHAVIOR OF CTP ON PYRITE AND CHALCOPYRITE IN DIFFERENT ALKALINE MEDIA

有机抑制剂ＣＴＰ对矿物的抑制能力与介质ｐＨ和调整剂种类有关，在碱性条件下ＣＴＰ对黄铁矿有抑制作用，而对黄铜矿则没有抑制作用；用ＣａＯ调ｐＨ时，ＣＴＰ对黄铁矿的抑制能力增强；人工混合矿物和矿石试验结果表明，用石灰调浆到ｐＨ９．５，ＣＴＰ可以有效实现黄铜矿和黄铁矿的浮选分离，精矿铜品位达到２４％，铜回收率达到９７％以上，并且ＣＴＰ不影响伴生金、钼的回收。动电位测定表明，ＣＴＰ可以和黄铁矿发生化学吸附，溶液中有钙离子存在时ＣＴＰ和黄铁矿表面作用增强。矿物表面氧化热力学计算表明，ＣａＯ的加入不仅提离了矿浆ｐＨ，同时还降低了黄铁矿表面氧化静电位，而黄铜矿氧化静电位基本不受影响，从而扩大了ＣＴＰ与黄铁矿和黄铜矿表面作用的差异。

おhe depression behavior of a new organic depressant (CTP) for minerals is affected by pH values of media and pH regulator types In alkaline condition pyrite could be depressed by CTP, but chalcopyrite could not Experimental results of minerals and ores from Dexin Copper Mine show that CTP could effectively separate pyrite and chalcopyrite at pH 95 with copper grade of the concentrate being 24% and copper recovery over 975% In addition, recoveries of gold and molybdenum are not affected in the presence of CTP Determinations of Zetapotential indicate that CTP could make chemical adsorption on the pyrite surface, and the interaction of CTP with pyrite is more intensive in the presence of Ca^2+ The results of thermodynamic calculation indicate that adding CaO has not only increased the pH of pulp, but lowered the potential of pyrite surface oxidation at the same time However, the potential of chalcopyrite is unaffected, so difference of CTP interaction with pyrite and chalcopyrite has enlarged