丁基钠黄药浮选斑铜矿的吸附热力学和动力学研究

研究了斑铜矿的浮选行为，并通过吸附量测试、红外光谱、吸附动力学及热力学计算研究丁基钠黄药(简称NaBX)在斑铜矿表面的吸附机理.斑铜矿在pH为5~9时可浮性较好，药剂在矿物表面的吸附属Freundlich模型的多分子层吸附;当 pH 为12时可浮性差，属于Lamgmuir模型的单分层吸附.NaBX在矿物表面吸附符合二阶动力学方程，是自发进行的化学吸附过程，通过热力学计算得出pH 为9时的吸附反应比pH为12时更容易发生.红外光谱测试表明，当pH为5~9时NaBX在斑铜矿表面的吸附产物为Cu(BX)₂，Fe(BX)₃和(BX)₂，而当pH为12时的吸附产物为Cu(BX)₂.

Adsorption Thermodynamics and Kinetics of Bornite Using Sodium Butyl Xanthate as Collector in Flotation

The flotation performance of bornite was investigated， and the adsorption mechanism of sodium butyl xanthate(NaBX) on the bornite surface was studied by using the adsorption measurement， infrared spectroscopic analysis， adsorption kinetics and thermodynamic calculation. The pH value ranging from 5 to 9 is favorable for highter floatability， and the adsorption conforms to the multimolecular layer adsorption of Freundlich model. When the pH value is 12， the floatability is poor， and the adsorption belongs to monolayer adsorption of Lamgmuir model. The adsorption of NaBX on the bornite surface conforms to second-order kinetic equation， and it is a spontaneous chemical adsorption process. The thermodynamic calculation shows that the adsorption reaction at pH 9 is easier than that at pH 12. Infrared spectroscopic analysis shows that the adsorption species of NaBX on the surface of bornite contain Cu(BX)₂，Fe(BX)₃ and(BX)₂ when the pH ranges from 5 to 9， while there is only Cu(BX)₂ when pH is 12.