方铅矿自诱导浮选的电化学和量子化学研究

给出了方铅矿自诱导浮选电位区域和电位上下限,热力学计算表明了其意义。伏安曲线和量子化学计算分别用来研究方铅矿表面的阳极氧化和氧化过程中电子转移的微观机制。用表面溶剂提取—化学分析技术建立了自诱导浮选中方铅矿表面的琉水/亲水平衡关系。结果表明,方铅矿表面荷负电的硫原子能转变成电中性的单质硫,导致方铅矿表面疏水。方铅矿浮选回收率与中性硫提取量成正比。

ELECTROCHEMICAL AND QUANTUM-CHEMICAL INVESTIGATIONS ON SELFINDUCED FLOTATION OF GALENA

The effective potential range of self-induced flotation of galena and its lower and upper limits have been determined. The results of thermody namical calculation are used to explain the controlling action of the low er and upper potential limits. The surface oxidation of galena and the micro-process of electron transfer involved in the oxidation have been stu died through voltammetry and quantum chemical calculation. The hydro phobicity-hydrophilicity balance for the self-induced galena flotation has been established through surface solvent extraction and chemical analysis. The results show that the negativa sulfur ioas on galena surface are easily converted into neutral elementary sulfur. This conversion plays the key role in the self-induced flotatioa of galena. The flotation recovery is pro portional to the amount of neutral sulfur extracted from the galena sur face.