文献类型：期刊文献

英文题名：Recovery of potassium hydroxide from strong potassium aluminate solutions using solvent extraction with alkyl phenols

作者：Xue, Jin[1,2];Liu, Cheng-Lin[1,2];Luo, Meng-Jie[1,2];Bao, Yong-Xin[1,2];Jiang, You-Fa[1,2];Rohani, Sohrab[3];Li, Ping[1,2];Yu, Jian-Guo[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China;[3]Western Univ, Dept Chem & Biochem Engn, London, ON N6A 5B9, Canada

年份：2019

卷号：184

起止页码：183

外文期刊名：HYDROMETALLURGY

收录：;EI(收录号：20190506434450);WOS:【SCI-EXPANDED(收录号:WOS:000461408200021)】；

基金：The authors wish to acknowledge National Natural Science Foundation of China (No. 21776089, No. U1610102), the China Postdoctoral Science Foundation (No. 2018M641940), the International S&T Cooperation Programme of China (Grant 2016YFE0132500).

语种：英文

外文关键词：Potassium hydroxide extraction; Alkyl phenol extractant; Multi-stage extraction; Liquid-liquid extraction; Potassium aluminate solution

摘要：Solvent extraction of potassium hydroxide from strong potassium aluminate solutions was investigated systematically, where alkyl phenols with the stereo-hindrance of alkyl substituents to the hydroxyl functional group were used as extractants. The research focused on organic phase, phase equilibrium, multi-stage counter current extraction/stripping and extraction mechanism. The alkyl phenol, namely 2,4-di-tert-butylphenol, was found to be a promising extractant. When it was dissolved in 1-octanol diluent to form an organic phase, this organic phase would have a higher K/Al selectivity and a good stability for KOH extraction from the strong potassium aluminate solution. The extraction mechanism of KOH by alkyl phenol was analyzed and found to agree with the so-called pseudo-hydroxide extraction mechanism. The phase equilibrium curves in both KOH-H2O-organic phase system and KOH-KAlO2-H2O-organic phase system were measured at different temperatures with different extractant concentrations. Based on the measured phase equilibrium data, a multi-stage counter current extraction/stripping process was designed, and experiments by single-stage, two-stage and three-stage processes were carried out to evaluate the feasibility and efficiency of the KOH extraction from the strong alkaline potassium aluminate solutions. Through a three-stage extraction process at 40 degrees C, KOH concentration in potassium aluminate solution with 3.7 mol/L Al can be decreased from 528 g/L to 312 g/L, satisfying the Al(OH)(3) seeded precipitation condition.