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三元体系KCl-ZnCl2-H2O在323 K下的相平衡研究

Phase equilibrium of ternary system KCl-ZnCl2-H2O at 323 K

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【作者】 魏雪琦贺晓峰桑世华

【Author】 WEI Xue-qi;HE Xiao-feng;SANG Shi-hua;College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology;

【通讯作者】 桑世华;

【机构】 成都理工大学材料与化学化工学院

【摘要】 为了研究氧化锌矿氯化浸出液盐类溶解规律,文中采用等温溶解平衡法进行了323 K时三元体系KCl-ZnCl2-H2O的稳定相平衡研究,并采用X射线粉晶衍射法和湿固相法对平衡固相的成分进行了鉴定,还对不同温度下该体系的溶解度进行了对比分析。研究发现KCl-ZnCl2-H2O相平衡体系有复盐生成,为复杂三元体系,该体系相图中有2个共饱点,3条溶解度曲线,3个固相结晶区(分别对应了KCl,2KCl·ZnCl2和ZnCl2)。由溶解度数据和相图发现,氯化锌对氯化钾有明显的增溶效应。当氯化钾溶解度逐渐增大达最大值,再加入氯化锌,氯化钾的溶解度又开始降低并生成化学式为2KCl·ZnCl2的复盐。

【Abstract】 In order to study the dissolution of leaching salts of zinc oxide ore, the stable phase equilibrium of the ternary system KCl-ZnCl2-H2O at 323 K was studied by means of isothermal dissolution equilibrium method. The equilibrium solid phase was identified by X-ray powder diffraction and wet solid phase method, and the solubility data of this ternary system at 323 K were compared and discussed at different temperatures. The results indicate that the ternary system has the formation of complex salts, which is a complex ternary system. The ternary system at 323 K has two invariant points, three univariant curves and three crystallization fields(corresponding to KCl, 2 KCl·ZnCl2 and ZnCl2, respectively). It is found from the solubility data and phase diagram that zinc chloride has an obvious solubilizing effect on potassium chloride. When the solubility of potassium chloride gradually increases to a maximum, the solubility of potassium chloride begins to decrease again after adding zinc chloride, and the compound salt of chemical formula 2 KCl·ZnCl2 is formed.

【关键词】 相平衡氯化锌溶解度氧化锌矿
【Key words】 phase equilibriumzinc chloridesolubilityzinc oxide ore
【基金】 国家自然科学基金资助项目(41873071);四川省教育厅高校科研创新团队项目(15TD0009)
  • 【文献出处】 化学工程 ,Chemical Engineering(China) , 编辑部邮箱 ,2020年04期
  • 【分类号】O642.42;TF813
  • 【被引频次】2
  • 【下载频次】137
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