Cu(II)-Glu^(2-)-CO_3^(2-)-H_2O体系热力学平衡分析

Thermodynamic Equilibrium Analysis on Cu(II)-Glu^(2-)-CO_3^(2-)-H_2O System

以L-谷氨酸一钠作为浸出剂浸出低品位氧化铜矿的常见铜形态—碱式碳酸铜,根据配位化学理论,研究了Cu(II)-Glu2--CO32--H2O体系中Cu(II)的配合平衡热力学,并绘制了L-谷氨酸一钠浓度0～3mol/L和pH5～14内的热力学平衡图,研究了L-谷氨酸一钠浓度、pH和游离CO32-浓度对L-谷氨酸一钠浸出碱式碳酸铜的影响,并对热力学计算结果进行了实验验证.结果表明,铜离子浓度理论计算值与实验值相对误差的绝对平均值为5.32%,所选数据的准确性较好,同时也说明用谷氨酸一钠浸出低品位氧化铜矿是可行的.

Leaching behaviors of basic cupric carbonate [CuCO3·Cu（OH）2] as general phase in low grade cupric oxide ore with L-monosodium glutamate were studied,and thermodynamics of Cu（II） complex equilibrium in Cu（II）-Glu2--CO32--H2O system was studied by coordination chemistry principle.Varying the concentration of L-monosodium glutamate and pH value in the ranges of 0～3 mol/L and 5～14 respectively,the equilibrium thermodynamic diagrams were drawn,and the effects of L-monosodium glutamate concentration,pH value and free carbonate ion concentration on leaching of basic cupric carbonate were also studied.The comparison of theoretical calculation and experimental result shows that the absolute average value of relative error between them is 5.32%.The results indicate that the critical data and the thermodynamic model are convincible.Therefore,it is feasible to leach low grade cupric oxide ore with L-monosodium glutamate.