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CN101837998B 一种氯化铝溶液的蒸发浓缩结晶方法 有权 转让

一种氯化铝溶液的蒸发浓缩结晶方法
摘要：
本发明涉及一种氯化铝溶液的蒸发浓缩结晶方法，所述方法包括如下步骤：a、循环蒸发：通过多效强制循环蒸发器逐级对氯化铝溶液进行循环蒸发浓缩；b、沉降分离：在至少部分所述强制循环蒸发器的分离室中，沉降分离六水氯化铝(AlCl3·6H2O)固体结晶物；c、闪蒸结晶：将所述沉降分离步骤中得到的含氯化铝固体结晶物的溶液送入闪蒸结晶槽，并在温度为60～75℃、真空度为0.095～0.08Mpa的条件下进行真空闪蒸；d、结晶过滤：将所述闪蒸结晶步骤中的出料输送至过滤机进行过滤。本发明采用三效全逆流强制循环蒸发器组加一效闪蒸的方式，使溶液中的氯化铝成分在浓缩过程中完全结晶为六水氯化铝晶体。
摘要（英）：

The invention relates to a method for evaporating, concentrating and crystallizing the solution of aluminum chloride. The method comprises the following steps of: a, performing circulating evaporation: performing circulating evaporation concentration on the solution of aluminum chloride stage by stage by using a multi-effect forced circulation evaporator; b, performing settlement separation: in at least a part of a separation room of the forced circulation evaporator, performing settlement separation on solid crystals of aluminum chloride hexahydrate (AlCl3.6H2O); c, performing flash evaporation crystallization: sending the solution containing solid crystals of aluminum chloride obtained by the settlement separation step to a flash evaporation crystallization tank and performing vacuum flash evaporation on the solution under the condition that the temperature is between 60 and 75 DEG C and the vacuum degree is 0.095 to 0.08Mpa; and d, performing crystallization filtration: conveying the discharged materials obtained by the flash evaporation crystallization step to a filter for filtrating. In the method, the aluminum chloride in the solution is completely crystallized into the crystals of aluminum chloride hexahydrate in a concentration process by adopting the mode of combining the three-effect complete counter-current forced circulation evaporator group and the one-effect flash evaporation.

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