Abstract The production of soda ash by the Solvay method is accompanied by the formation of wastewater, much of which is the distiller liquid containing up to 100 g/L calcium chloride and up to 50 g/L sodium chloride. A highly efficient electrochemical method was proposed to treat the distiller liquid to form calcium hydroxide, sodium hydroxide, and hydrochloric acid. The proposed process consists of two stages. At the first stage, the distiller liquid is treated with alkali to produce calcium hydroxide and a filtrate containing sodium chloride. At the second stage, the filtrate is processed in a membrane electrolyzer to obtain solutions of sodium hydroxide and hydrochloric acid. It was shown that the process of treating the distiller liquid with alkali should be carried out at a CaCl 2 : NaOH molar ratio of 1 : 1.25. The processing of the filtrate in the membrane electrolyzer makes it possible to obtain sodium hydroxide at a concentration of up to 4320 g/L and hydrochloric acid at a concentration of 148 g/L.

中文翻译：

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纯碱生产废水的高效能源资源综合处理技术的理化基础

摘要 索尔维法生产纯碱伴随着废水的形成，其中大部分是含有高达 100 g/L 氯化钙和高达 50 g/L 氯化钠的蒸馏液。提出了一种高效的电化学方法来处理蒸馏液以形成氢氧化钙、氢氧化钠和盐酸。拟议的过程包括两个阶段。在第一阶段，蒸馏液用碱处理，产生氢氧化钙和含有氯化钠的滤液。在第二阶段，滤液在膜电解槽中处理，得到氢氧化钠和盐酸溶液。结果表明，用碱处理蒸馏液的过程应在CaCl 2 :NaOH 摩尔比为1:1.25 下进行。