低碱度铜硫分离抑制剂及抑制机理的研究

Depressor for Cu-S Separation in Low Alkaline Medium and Its Depressing Mechanism

在pH=7—8低碱度条件下，以Ca（ClO）2抑制黄铁矿，进行铜硫浮选分离试验，并探讨了Ca（ClO）2对黄铁矿的抑制机理。试验表明，Ca（ClO）2是黄铁矿的良好抑制剂，在矿浆pH=7～8低碱度条件下，不添加石灰，只需加入少量的Ca（ClO）2抑制剂，就可以很好地抑制黄铁矿，实现铜硫分离。Ca（ClO）2作用前后黄铁矿矿物表面拉曼光谱分析表明，Ca（ClO）2抑制黄铁矿实现铜硫分离的机理为在矿浆pH=7～8低碱度条件下，Ca（ClO）2氧化黄铁矿表面，使其表面产生主要成分为Fe（OH）3和CaCO3的亲水薄膜，提高了亲水性，使其在铜硫浮选分离作业中被充分抑制，从而实现铜硫分离。

Cu-S separation test was conducted at pH = 7 -8 with Ca（ClO） 2 as the depressor for pyrite, and the depressing mechanism of Ca（ClO） 2 for pyrite was studied. The test shows that Ca（ClO） 2 is a good depressor for pyrite and good Cu-S separation can be achieved at a low alkalinity of pH = 7 -8 with only a small amount of Ca （ClO）2 but without lime. The analysis of Raman spectrograms before and after the addition of Ca （ClO） 2 indicates that at a pH of 7 - 8, Ca （ClO） 2 will oxidize the pyrite surface to produce a hygrophilous fihn of Fe（OH） 3 and CaCO3 on it, which can enhance the hydrophilieity of pyrite surface, making it fully depressed so as to achieve a separation of copper from sulfur.