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首页> 外文期刊>Hydrometallurgy >Recovery of potassium hydroxide from strong potassium aluminate solutions using solvent extraction with alkyl phenols
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Recovery of potassium hydroxide from strong potassium aluminate solutions using solvent extraction with alkyl phenols

机译：使用烷基酚萃取从强钾铝酸盐溶液中氢氧化钾回收氢氧化钾

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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.
机译：系统地研究了来自强铝酸钾溶液的氢氧化钾的溶剂萃取，用烷基取代基与羟基官能团的立体声的烷基酚用作萃取剂。研究专注于有机相，相平衡，多级计数器电流萃取/汽提和提取机制。发现烷基酚，即2,4-二叔丁基苯酚，是有希望的萃取剂。当其溶解在1-辛醇稀释剂中以形成有机相时，该有机相具有较高的K / Al选择性和来自强铝酸钾溶液的KOH萃取的良好稳定性。分析KOH烷基酚的萃取机制，发现与所谓的假氢氧化物萃取机制一致。在不同的萃取剂浓度的不同温度下测量KOH-H2O-有机相体系和KOH-KALO2-H2O-有机相体系中的相平衡曲线。基于测量的相平衡数据，设计了一种多级计数器电流提取/汽提工艺，并进行了单级，两级和三级工艺的实验，以评估KOH提取的可行性和效率强碱性铝酸钾溶液。通过在40摄氏度下的三级提取过程中，用3.7mol / L Al的铝酸钾溶液中的KOH浓度可从528g / L降至312g / L，满足Al（OH）（3）种子沉淀条件。

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