氯化铝中萃取铁工艺

doi:10.11944/j.issn.1000-0518.2018.01.170040

摘要/Abstract

摘要：

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Al³⁺浓度为2.0 mol/L,Fe³⁺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。

关键词: 高纯氯化铝, 提纯, 萃取, 铁, N,N,N',N'-四辛基-3-氧戊二酰胺

Abstract:

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(Ⅲ) 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.

Key words: high purity aluminum chloride, purification, extraction, Fe(Ⅲ), N,N,N',N'-tetraoctyl-3-oxy-glutaramide

尚吉光, 孙国新. 氯化铝中萃取铁工艺[J]. 应用化学, 2018, 35(1): 75-81.

SHANG Jiguang, SUN Guoxin. Extraction of Fe(Ⅲ) from Aluminum Chloride[J]. Chinese Journal of Applied Chemistry, 2018, 35(1): 75-81.

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