| Mg2+-CO32--Gly--H2O体系热力学分析 |
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| 引用本文： | 窦爱春,刘彤,张也,刘云建,苏明如.Mg2+-CO32--Gly--H2O体系热力学分析[J].矿冶,2020,29(2):78-84. |
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| 作者姓名： | 窦爱春 刘彤 张也 刘云建 苏明如 |
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| 作者单位： | 江苏大学材料科学与工程学院,江苏镇江212013;长沙矿冶研究院有限责任公司,长沙410000 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 根据碳酸镁在氨基乙酸盐(Gly~--H_2O)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298K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(7pH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。
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| 关 键 词： | MgCO3 热力学 氨基乙酸 |
| 收稿时间： | 2019/10/11 0:00:00 |
| 修稿时间： | 2019/11/19 0:00:00 |
Thermodynamics analysis of Mg2+-CO32--Gly--H2O system |
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| DOU Aichun,LIU Tong,ZHANG Ye,LIU Yunjian and SU Mingru.Thermodynamics analysis of Mg2+-CO32--Gly--H2O system[J].Mining & Metallurgy,2020,29(2):78-84. |
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| Authors: | DOU Aichun LIU Tong ZHANG Ye LIU Yunjian and SU Mingru |
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| Affiliation: | School of Material Science and Engineering,Jiangsu University,School of Material Science and Engineering,Jiangsu University,School of Material Science and Engineering,Jiangsu University,School of Material Science and Engineering,Jiangsu University,School of Material Science and Engineering,Jiangsu University |
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| Abstract: | 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 Mg2+, free concentration of Mg2+, free concentration of Gly-, free concentration of CO32-, species distribution of Mg2+ and species distribution of Gly- were investigated respectively in the system at 298K. 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 of the coordination ability of Gly- with Mg2+ is very weak. |
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| Keywords: | MgCO3 thermodynamic glycine |
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