DHN对富镍黄铁矿活化机理研究

Study on activation mechanism of DHN for nickel-rich pyrite

对富镍黄铁矿进行了单矿物浮选试验,并采用Zeta电位检测、FTIR和XPS手段对富镍黄铁矿表面进行了表征。结果表明,随着含硫化合物DHN用量的增加,富镍黄铁矿的电位呈负向增大,富镍黄铁矿表面黄原酸盐的吸附量先增加后减少,而黄药的吸附量则逐渐增加。碱性条件下有利于DHN在富镍黄铁矿表面发生氧化反应,并生成单质硫。此外,经DHN作用后富镍黄铁矿表面的S元素含量增加,形成的含硫物质主要为疏水的单质硫和多硫化物,可明显改善富镍黄铁矿的可浮性。

Flotation test was conducted on single mineral in nick- el-rich pyrite and the nickel-rich pyrite surface was characterized by Zeta, FTIR and XPS potential detection. The results showed that with the increase of amount of sulfur compound DHN, ; po- tential of nickel-rich pyrite enlarged negatively, adsorption amount of xanthate existed on the surface of nickel-rich pyrite increased and then decreased, and adsorption amount of xanthate molecule gradually increased. Alkaline condition was favorable for DHN to be oxidized on nickel-rich pyrite surface and to generate elemental sulfur. In addition, sulfur concentration on the nickel-rich pyrite surface increased after DNH was oxidized, and the formed sulphur bearing materials were mainly hydrophobic sulfur and polysulfide, which could improve the floatability of nickel-rich pyrite.