海水体系中蒙脱石对黄铁矿的抑制机理研究

Study on the Inhibition Mechanism of Montmorillonite on Pyrite in Seawater System

为探究海水体系下蒙脱石对黄铁矿可浮性的影响,进行了不同蒙脱石占比条件下纯水和海水体系中黄铁矿的浮选试验,并通过矿物表面电位及三相泡沫结构测试,海水组分分析和DLVO理论计算等,研究诸因素对黄铁矿的抑制机理。结果表明:弱酸和弱碱性条件下,纯水体系中的蒙脱石具有抑制黄铁矿上浮的作用,海水体系则进一步强化了对黄铁矿的抑制,导致黄铁矿几乎不可浮;黄铁矿和蒙脱石在海水中的矿物表面电位更小,蒙脱石更容易罩盖在黄铁矿表面;弱碱性环境下,黄铁矿在纯水中的浮选回收率为95%,而在海水和蒙脱石占比30%的条件下,黄铁矿的回收率仅为5%,说明海水可强化蒙脱石抑制黄铁矿。研究结果有助于指导用海水解决铜硫浮选分离工业实践抑制剂成本高及铜硫分离困难等问题。

In order to explore the effect of montmorillonite on the pyrite floatability in seawater system,the flotation tests of pyrite in pure water and seawater system under different montmorillonite proportions were carried out.The inhibition mechanism of various factors on pyrite was studied by mineral surface potential and three-phase foam structure test,seawater composition analysis and DLVO theoretical calculation.The results showed that under weak acid and weak alkaline conditions,montmorillonite in pure water system had the effect of inhibiting pyrite floating,while seawater system further strengthened the inhibition of pyrite,resulting in almost non-floating of pyrite.The surface potential of pyrite and montmorillonite in seawater was smaller,and montmorillonite was easier to cover the surface of pyrite.In the weak alkaline environment,the flotation recovery rate of pyrite in pure water was 95%,while the recovery rate of pyrite was only 5%under the condition of seawater and montmorillonite accounting for 30%,indicating that seawater could strengthen montmorillonite to inhibit pyrite.The research results are helpful to guide the use of seawater to solve the problems of high cost of inhibitors and difficult separation of copper and sulfur in industrial practice of copper-sulfur flotation separation.