氯化铝中萃取铁工艺

Extraction of Fe( Ⅲ) from Aluminum Chloride

采用萃取剂N,N,N',N'-四丁基丙二酰胺(TBMA)、N,N,N',N'-四辛基-3-氧戊二酰胺(TODGA)和甲基异丁基甲酮(MIBK)从氯化铝水溶液中萃取铁,以制备高纯氯化铝。研究结果表明,当氯化铝溶液中盐酸浓度在4 mol/L左右时,TBMA和MIBK的萃取率在90%以上。TODGA显示出优异的萃取分离性能。当氯化铝溶液中Al^(3+)浓度为2.0 mol/L,Fe^(3+)浓度为0.0036 mol/L(0.2 g/L),HCl浓度为1.2 mol/L时,0.20 mol/L TODGA的环己烷或环己烷有机相对铁的一次萃取率达到99.9%以上,多次萃取后溶液中的铁含量低于0.01 mg/L,能深度去除氯化铝中的铁杂质,在工业化生产中有极大的应用价值。

The extraction behaviors of Fe （ Ⅲ ） in the preparation of high purity aluminum chloride with N, N, N＇, N＇-tetrabutyl malonamide （ TBMA ）, N, N, N＇, N＇-tetraoctyl-3-oxy-glutaramide （ TODGA ） and methyl isobutyl ketone（MIBK） have been investigated. The results show that the extraction efficiency of Fe（ 111 ） with TBMA or MIBK is 90% when the concentration of hydrochloric acid in the aluminum chloride solution is 4 mol/L. TODGA shows an excellent separation performance. When the concentrations of Al3＋ , Fe3＋ , and HCl are 2.0 mol/L, 0. 0036 mol/L（0. 2 g/L）, and 1.2 mol/L, respectively, in the solution of aluminum chloride, the extraction efficiency of Fe3＋ is more than 99.9% with 0. 20 mol/L TODGA in cyclohexane or n-dodecane. After several extractions, the iron impurities in the aluminum chloride can be deeply removed and the iron content in the solution is lower than 0. 01 mg/L, indicating that it has potential application in industrial production.