In this paper,the effect of sodium butyl xanthate(NaBX)adsorption on the surface of bornite at different pH on flotation was studied by adsorption kinetic and thermodynamic.The flotation results demonstrated that the ...In this paper,the effect of sodium butyl xanthate(NaBX)adsorption on the surface of bornite at different pH on flotation was studied by adsorption kinetic and thermodynamic.The flotation results demonstrated that the recovery was the highest when pH was 9 in NaBX solution(4×10^?5 mol/L).The adsorption kinetics showed the reaction of NaBX on the bornite conformed to the second order kinetic equation;it belonged to the multimolecular layer adsorption of Freundlich model;the maximum adsorption rate constant was 0.30 g/(10^?6 mol·min),and the equilibrium adsorption capacity was 2.70×10^?6 mol/g.Thermodynamic calculation results indicated that the adsorption process was spontaneous chemisorption,and the adsorption products of NaBX on bornite surface were cupric butyl xanthate,ferric butyl xanthate and dixanthogen,which were confirmed by infrared spectrum measurements.展开更多
文摘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Na BX)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. Na BX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Na BX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.
基金Projects(51504053,51374079)supported by the National Natural Science Foundation of ChinaProject(2015M571324)supported by the Postdoctoral Science Foundation of China
文摘In this paper,the effect of sodium butyl xanthate(NaBX)adsorption on the surface of bornite at different pH on flotation was studied by adsorption kinetic and thermodynamic.The flotation results demonstrated that the recovery was the highest when pH was 9 in NaBX solution(4×10^?5 mol/L).The adsorption kinetics showed the reaction of NaBX on the bornite conformed to the second order kinetic equation;it belonged to the multimolecular layer adsorption of Freundlich model;the maximum adsorption rate constant was 0.30 g/(10^?6 mol·min),and the equilibrium adsorption capacity was 2.70×10^?6 mol/g.Thermodynamic calculation results indicated that the adsorption process was spontaneous chemisorption,and the adsorption products of NaBX on bornite surface were cupric butyl xanthate,ferric butyl xanthate and dixanthogen,which were confirmed by infrared spectrum measurements.
