Mg&2+-CO3^2--Gly--H2O体系热力学分析  

Thermodynamics analysis of Mg^2+-CO3^2--Gly--H2O system

作　　者：窦爱春[1] 刘彤 张也 刘云建[1] 苏明如[1] 吴江华[2] DOU Ai-chun;LIU Tong;ZHANG Ye;LIU Yun-jian;SU Ming-ru;WU Jiang-hua(School of Material Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China;Changsha Research Institute of Mining and Metallurgy Co.Ltd.,Changsha 410000,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]长沙矿冶研究院有限责任公司,长沙410000

出　　处：《矿冶》2020年第2期78-84,共7页Mining And Metallurgy

基　　金：国家自然科学基金资助项目(51604124);湖南省自然科学基金(2017JJ3320);江苏大学高级人才资金资助项目(13JDG097)。

摘　　要：根据碳酸镁在氨基乙酸盐(Gly--H2O)体系中的溶解热力学平衡方程建立了其溶解热力学模型,分别分析了298 K时体系中镁离子总浓度、游离镁离子浓度、游离氨基乙酸根离子浓度、游离碳酸根离子浓度、镁物种分布以及氨基乙酸根物种分布热力学结果。结果表明,在酸性氨基乙酸盐体系中(pH值<7),碳酸镁溶解以酸溶作用为主,碳酸镁可以大量溶于酸性氨基乙酸盐溶液中;在碱性氨基乙酸盐体系中(7<pH值<14),碳酸镁溶解以氨基乙酸根离子与镁离子配合作用为主,由于氨基乙酸根离子与镁离子配合能力较弱,碳酸镁不可能溶于碱性氨基乙酸盐溶液中。The thermodynamic model of the dissolution of MgCO3 in glycinate aqueous solution(Gly--H2O system)was constructed according to the thermodynamic equilibrium equations in the system.Thermodynamic results of total concentration of Mg^2+,free concentration of Mg^2+,free concentration of Gly-,free concentration of CO3^2-,species distribution of Mg^2+and species distribution of Gly-were investigated respectively in the system at 298 K.It is found that MgCO3 can be dissolved in acidic Gly--H2O system for acid leaching by aminoacetic acid.MgCO3 cannot be dissolved in alkaline Gly--H2O system for complex-leaching by Gly-because the coordination ability of Gly-with Mg^2+is very weak.

关 键 词：MGCO3 热力学 氨基乙酸 

分 类 号：O642.4[理学—物理化学]