Based on the crystallization of AlCl3 ・6H2 O in the acid-leaching filtrate of gangue ,the solubility of AlCl3 ・6H2 O in Fe (Ⅲ)-K-Ca-Cl-H2 O system was measured by equilibrium method at 25-70 ℃ .The experiment results show that the solubility of AlCl3 ・6H2O in all measured cases increases slowly with the increase of temperature .The solubility of AlCl3 ・6H2O decreases with increasing one of the solution concentrations for fixing the other of them in the KCl-FeCl3-H2 O ,CaCl2-FeCl3-H2 O and CaCl2-KCl-H2O systems .This case might be ascribed to the common ion effect of added Cl- .It also can be shown that the con-centration of solutions is the main factor for affecting the solubility of AlCl3 ・6H2O while the effect of temperature on the solubil-ity can be ignored .This provides an important theoretical support for design and optimization of the industrial crystallization process of AlCl3 ・6H2 O .%针对煤矸石酸浸提铝工艺中AlCl3・6H2 O的结晶问题，采用静态法测定了25、50、70℃时AlCl3・6H2 O在Fe（Ⅲ）-K-Ca-Cl-H2 O体系中的溶解度。结果表明：在KCl-FeCl3-H2 O、CaCl2-FeCl3-H2 O和CaCl2-KCl-H2 O体系中，AlCl3・6H2 O的溶解度均随着温度的升高而有所增大；而在所测溶液浓度范围内（0～1 mol／L），固定其中一种溶液的浓度，AlCl3・6H2O的溶解度随着另一溶液浓度的增大皆不断减小，这是由氯离子的加入产生的同离子效应导致的。通过比较溶解度数据发现，溶液浓度是影响AlCl3・6H2 O溶解度的主要因素，温度对AlCl3・6H2 O溶解度的影响可忽略，这为AlCl3・6H2 O的工业结晶过程的设计和优化提供了理论依据。
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