含锂盐湖卤水体系相关系的研究

Studies on the Phase Diagram for the Quinary System Li￣+, Na￣+, K￣+, Mg￣(2+)/SO_4￣(2-)-H_2O at 25℃

用等温溶解平衡法研究了盐湖卤水体系Ｌｉ＋，Ｎａ＋，Ｋ＋，Ｍｇ２＋／ＳＯ＿４￣２－Ｈ２Ｏ２５℃溶解度，获得了该五元体系２５℃溶解度相图的十个无变量点和十个结晶区．十个结晶区分别对应于原始组份Ｋ２ＳＯ４、Ｌｉ２ＳＯ４·Ｈ２Ｏ、ＭｇＳＯ４·７Ｈ２Ｏ、Ｎａ２ＳＯ４·１０Ｈ２Ｏ、复盐３Ｋ２ＳＯ４·Ｎａ２ＳＯ４、Ｎａ２ＳＯ４·ＭｇＳＯ４·４Ｈ２Ｏ、Ｌｉ２ＳＯ４·３Ｎａ２ＳＯ４·１２Ｈ２Ｏ、２Ｌｉ２ＳＯ４·Ｎａ２ＳＯ４·Ｋ２ＳＯ４·Ｌｉ２ＳＯ４·Ｋ２ＳＯ４和Ｋ２ＳＯ４·ＭｇＳＯ４·６Ｈ２Ｏ，此外没有产生新的复盐或固溶体，用现代电解质溶液理论－Ｐｉｔｚｅｒ模型校验该体系的溶解度测定值，结果令人满意．

Solubilities of the quinary system Li+, Na+, K+. Mg2+ /SO_4￣2--H2O were investigated by isothermal method at 25℃. Phase diagram of the quinary system consists of 10 invariantpoints and 10 crystallization fields. 10 crystallization fields correspond to arcanite, lithiun sulphate monohydrate. epsomite, mirabilite. aphthitalite, bloedite, Dbl (3Na2SO4. Li2SO4·12H2O), Db3 (2Li2SO4. Na2SO4· K2SO4), Db4 (Li2SO4·K2SO4), and picromerite. Pitzermodel of electrolyte solution was used to check the obtained solubilities, and comparison wasin good agreement.