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化学学报
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化学学报 ›› 1997, Vol. 55 ›› Issue (6): 545-552. 上一篇    下一篇

研究论文

五元体系Li^+, Na^+, K^+, Mg^2^+/SO~4^2^- - H~2O 25℃相关 系的研究

李冰;孙柏;房春晖;杜宪惠;宋彭生   

  1. 中国科学院盐湖研究所西安二部
  • 发布日期:1997-06-15

Studies on the phase diagram for the quinary system Li^+, Na^+, K^+, Mg^2^+/SO~4^2^- - H~2O at 25℃

Li Bing;Sun Bai;Fang Chunhui;Du Xianhui;Song Pengsheng   

  • Published:1997-06-15

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用等温溶解平衡法研究了五元体系Li^+,Na^+,K^+,Mg^2^+/SO~4^2^--H~2O25℃溶解度,测得了平衡溶液的密度,获得了该五元体系25℃溶解度相图的十个无变量点和十种平衡固相。十个单盐结晶区分别对应于原始组分K~2SO~4,Li~SO~4.H~2O,MgSO~4.7H~2O,水合物Na~2SO~4.10H~2O,复盐3K~2SO~4.Na~2SO~4,Na~2SO~4.MgSO~4.4H~2O,Li~2SO~4.3Na~2SO~4.12H~2O,2Li~2SO~4.Na~2SO~4.K~2SO~4,Li~2SO~4.K~2SO~4和K~2SO~4.MgSO~4.6H~2O,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。

关键词: 五元体系, 相关系, 锂离子, 钠离子, 钾离子, 镁离子, 硫酸根, 溶液平衡, 溶解度, 溶解度相图

Solubilities of the quinary system Li^+, Na^+, K^+, Mg^2^+/SO~4^2^- - H~2O were investigated by isothermal method at 25℃. Phase diagram of the quinary system consists of 10 invariant points and 10 crystallization fields corresponding to arcanite, lithiun sulphate monohydrate, epsomite, mirabilite, aphthitalite, bloedite, D1 (Li~2SO~4.3Na~2SO~4.12H~2O), D3 (2Li~2SO~4.Na~2SO~4.K~2SO~4), D4 (Li~2SO~4.K~2SO~4), and picromerite. Pitzer model of electrolyte solution was used to check the obtained solubilities, data comparison gives good agreement.

Key words: PHASE RELATION, LITHIUM ION, SODIUM ION, POTASSIUM ION, MAGNESIUM ION, SULFATE RADICAL, SOLUBILITY, PHASE DIAGRAM, DOUBLE SALTS

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