油酸钠直接浮选孔雀石的机理研究

研究了油酸钠直接浮选孔雀石的浮选行为及作用机理.采用浮选试验、Zeta电位测试、傅里叶红外光谱测试、溶液化学计算及热力学计算进行吸附机理分析.浮选试验表明:当捕收剂油酸钠用量为160 mg/L、pH值范围7~10时,孔雀石浮选回收率可以达到70%以上;当pH=9.5时,回收率为88.67%,达到最高;动电位及溶液化学表明:油酸钠在矿浆中的组分为C_(17)H_(33)COOH·C_(17)H_(33)COO~-,C_(17)H_(33)COO~-和(C_(17)H_(33)COO)_2~(2-),油酸钠在孔雀石表面主要发生了化学吸附;根据吉布斯自由能的计算和红外光谱测试分析表明:在合适的p H值范围,油酸钠与孔雀石表面的铜离子作用生成油酸铜盐沉淀,改变了孔雀石的表面性质使它表面疏水从而容易浮选回收.

Mechanism Study of Direct Flotation on Malachite by Sodium Oleate

The flotation behavior and action mechanism of sodium oleate as collector for direct flotation of malachite was studied.The adsorption mechanism of sodium oleate on the surface of malachite was investigated through the adsorption measurement， Zeta potential test， Fourier transform infrared spectroscopy analysis， and solution chemistry calculation and thermodynamic calculation of solution.The results showed that the recoveries of malachite are more than 70% at pH value from 7 to 10 with sodium oleate 160mg/L， which reached the highest value 88.67% at pH=9.5. The Zeta potential measurement and solution chemical calculation indicated that sodium oleate mainly emits the chemical adsorption on the surface of malachite， the active component are C₁₇H₃₃COOH·C₁₇H₃₃COO^-， C₁₇H₃₃COO^- and (C₁₇H₃₃COO)^2-₂ in sodium oleate solution. The results of Gibbs free energy calculation and FTIR spectrum analysis confirmed that oleate ions tends to react with malachite surface to form copper oleate precipitation causing malachite’s flotability.