文献类型：期刊文献

中文题名：三元体系AlCl_3+CaCl_2+H_2O,AlCl_3+FeCl_3+H_2O和CaCl_2+FeCl_3+H_2O在35℃时的相平衡

英文题名：Phase equilibria of AlCl_3+CaCl_2+H_2O, AlCl_3+FeCl_3 +H_2O and CaCl_2+FeCl_3+H_2O ternary systems at 35℃

作者：袁梦霞[1];乔秀臣[1]

机构：[1]华东理工大学资源与环境工程学院,上海200237

年份：2017

卷号：68

期号：7

起止页码：2653

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：20174304289465);Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2017_2018】；

基金：国家高技术研究发展计划项目(2011AA06A102);国家自然科学基金项目(21176082)~~

语种：中文

中文关键词：相平衡;溶解度;结晶;氯化铝;氯化钙;氯化铁

外文关键词：phase equilibria; solubility; crystallization; aluminum chloride; calcium chloride; ferric chloride

摘要：缺少含AlCl_3、CaCl_2和FeCl_3的溶液相平衡,使通过蒸发结晶从粉煤灰盐酸浸取液中制备纯净的AlCl_3?6H_2O变得比较困难。采用等温溶解法研究了三元体系AlCl_3+CaCl_2+H_2O,AlCl_3+FeCl_3+H_2O和CaCl_2+FeCl_3+H_2O在35℃时的相平衡关系,测定了相应的溶解度及密度,并绘制了相应相图及密度-组成图。实验结果表明:三元体系AlCl_3+CaCl_2+H_2O和AlCl_3+FeCl_3+H_2O分别有两条溶解度曲线,两个单盐结晶区,无复盐和共溶体产生,同离子效应导致增加溶液中CaCl_2和FeCl_3浓度会有效降低AlCl_3的溶解度;CaCl_2+FeCl_3+H_2O体系会形成复盐CaCl_2·2FeCl_3·7H_2O;所得35℃相图与25℃相图相比,三元体系AlCl_3+CaCl_2+H_2O和AlCl_3+FeCl_3+H_2O中AlCl_3·6H_2O结晶区增大,CaCl_2·6H_2O结晶区转变成CaCl_2·4H_2O结晶区,CaCl_2+FeCl_3+H_2O体系中CaCl_2·2FeCl_3·8H_2O结晶区转变为CaCl_2·2FeCl_3·7H_2O结晶区。
It is difficult to prepare pure AlCl3·6H2O through evaporation crystallization in aluminum recovery from leaching coal fly ash by hydrochloric acid, without phase equilibria diagram for AlCl3, CaCl2 and FeCl3 solution. The phase equilibria of AlCl3＋CaCl2＋H2O, AlCl3＋FeCl3＋H2O and CaCl2＋ FeCl3＋H2O ternary systems at 35℃ were investigated using isothermal dissolution method. After solubility and densities were measured, phase diagram and density diagram were plotted against compositions. The phase diagrams of AlCl3＋CaCl2＋H2O and AlCl3＋FeCl3＋H2O had two univariant curves and two crystallization zones without formation of double salt or solid solution. Solubility of AlCl3 decreased with increasing concentration of CaCl2 or FeCl3 due to common ion effect. Double salt CaCl2·2FeCl3·7H2O was formed in CaCl2＋FeCl3＋H2O ternary system. When temperature was increased from 25 ℃ to 35 ℃, phase equilibria diagrams of AlCl3＋CaCl2＋H2O, AlCl3＋FeCl3＋H2O and CaCl2＋FeCl3＋H2O were all changed. Crystallization zone of AlCl3·6H2O in AlCl3＋CaCl2＋H2O and AlCl3＋FeCl3＋H2O ternary systems was enlarged and crystallization zone of CaCl2·6H2O was converted into crystallization zone of CaCl2·4H2O. Crystallization zone of CaCl2·2FeCl3·8H2O in CaCl2＋FeCl3＋H2O ternary system was converted into crystallization zone of CaCl2·2FeCl3·7H2O.