Solubility of AlCl3路6H2O in the Fe(II) + Mg + Ca + K + Cl + H2O System and Its Salting-Out Crystallization with FeCl2

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• 作者：Wencheng Gao ; Zhibao Li ; Edouard Asselin
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：October 2, 2013
• 年：2013
• 卷：52
• 期：39
• 页码：14282-14290
• 全文大小：456K
• 年卷期：v.52,no.39(October 2, 2013)
• ISSN：1520-5045

文摘

Phase equilibria determination for the Al + Fe(II) + Mg + Ca + K + Cl + H₂O system showed that FeCl₂ is effective to promote the salting-out crystallization of AlCl₃路6H₂O. A novel process to recover AlCl₃路6H₂O from fly ash by salting-out crystallization with FeCl₂ is proposed and proven feasible. This novel process includes leaching of fly ash by hydrochloric acid, reduction of Fep>3+p> to Fep>2+p>, salting-out crystallization of AlCl₃路6H₂O with FeCl₂, and filtering followed by washing. The solubility of AlCl₃路6H₂O in the Fe(II) + Mg + Ca + K + Cl + H₂O system was determined over the entire practical concentration range and from 283.2 to 363.2 K using a dynamic method. The experimental solubilities were regressed to obtain new mixed solvent electrolyte (MSE) model parameters. These new parameters were capable of accurately representing the experimental data of the system from 283.2 to 343.2 K. The phase diagram of the ternary AlCl₃鈥揊eCl₂鈥揌₂O system at 298.2 and 333.2 K was successfully constructed with the aid of the new MSE model parameters. Based on the phase diagram, a promising route to recover AlCl₃路6H₂O by salting-out crystallization with FeCl₂ was generated and verified to be feasible in laboratory experiments. All the results generated from this study will provide fundamental data for industrial applications aiming at the recovery of alumina from fly ash resources.