Mg^(2+)-CO_3^(2-)-Ida^(2-)-H_2O体系热力学平衡分析  

Thermodynamic Equilibrium Analysis on Mg^(2+)-CO_3^(2-)-Ida^(2-)-H_2O System

作　　者：苏明如[1] 窦爱春[1] 刘帅 刘彤 高天 潘进 刘云建[1] SU Mingru;DOU Aichun;LIU Shuai;LIU Tong;GAO Tian;PAN Jin;LIU Yunjian(School of material Science and Engineering, Jiangsu University, Zhenjiang 212013, China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《矿产保护与利用》2018年第6期24-30,共7页Conservation and Utilization of Mineral Resources

基　　金：江苏大学高级人才启动基金(14JDG130);江苏省自然科学基金(BK20150506);国家自然科学基金(51604125;51604124;51774150)

摘　　要：针对碳酸镁在亚氨基二乙酸盐体系中的溶解热力学平衡方程建立了其溶解热力学模型,根据配位化学理论分析了亚氨基二乙酸根离子总浓度和p H值对体系中镁离子总浓度、游离镁离子浓度、游离亚氨基二乙酸根离子浓度和游离碳酸根离子浓度的影响,并分析了镁离子和亚氨基二乙酸根的物种分布规律。结果表明,在亚氨基二乙酸盐体系中,酸性条件下碳酸镁的溶解以酸溶作用为主,碱性条件下碳酸镁的溶解以亚氨基二乙酸根离子与镁离子配合作用为主,但是二者配合能力较弱,所以碳酸镁溶解量很低。Thermodynamic behaviors of magnesium carbonate(MgCO3)in iminodiacetate system were studied,and thermodynamic equilibrium equation was established.The theories of coordination chemistry was used to analysis the effect of the total concentration of Ida^2-and pH value on the total concentration of Mg^2+and the concentration of free Mg^2+,Ida2-and CO3^2-.Species distribution of Mg^2+and Ida^2-was also discussed.The results show that the dissolution of MgCO3under acidic condition is acid dissolution,while the dissolution of MgCO3under alkaline condition is coordination reaction between Mg^2+and Ida^2-.However,the dissolution quantity of MgCO3is very low in alkaline system because the coordination ability of Mg^2+with Ida^2-is very weak.

关 键 词：亚氨基二乙酸 热力学 碳酸镁 

分 类 号：TF813[冶金工程—有色金属冶金]