电位对无捕收剂溶液中黄铜矿表面化学构成的影响

采用循环伏安法、X射线光电子能谱研究了黄铜矿在中性无捕收剂浮选介质中不同电位极化后其表面产物相的化学构成.结果显示黄铜矿在中性无捕收剂溶液中表面相中的S以具有黄铜矿晶体结构的亚稳相缺金属硫化物CuFe1-xS2,CuS2和稳定相多硫化物Sn-的形态存在.当电位提高到0.1 V/SCE,表面相中的Sn-消失,大量的S0和少量高价态(+4/+6)硫相(S2O23-/SO24-)形成.当极化电位大于0.35 V/SCE,表面相中S0的量急剧减小,氧化形成了大量的高价态(+4/+6)硫相(S2O23-/SO24-).表面相中的Cu以CuFe1-xS2的形式存在,高电位下出现少量的CuO相.Fe在低电位...

Effect of Electric Potential on Chemical Composition of Surface on Chalcopyrite in Collectorless Solution

Chemical composition of the surface layer formed at different potentials in collectorless flotation solution at pH 6.97 was studied by cyclic voltammetry and X-ray photoelectron spectroscopy.The sulfur element existed in the surface layer mainly in the metastable phase forms of CuFe(1-x)S2,CuS2,and the stable phase of Sn-at open-circuit potential(OCP).When the potential increased to 0.1 V/SCE,Sn-disappeared while plentiful amounts of S0 and a small quantity of S2O32-/SO42-species were found in the film.At potentials higher than 0.35 V/SCE,the content of S0 in the surface layer was lower than that in the surface layer at 0.1 V,although the content of S2O32-/SO42-species increased dramatically.In addition,Cu element was present in the surface layer at lower potential in the form of CuFe1-xS2,and CuO present at higher potentials.Fe existed in the surface layer at lower potentials in the form of FeOOH and Fe2O3,and large amounts of Fe(OH)3 precipitated on the chalcopyrite surface at higher potentials.