Separation of aluminum and lithium in sulfuric acid roasting leachate of overhaul slag by Di-(2-ethylhexyl) phosphoric acid extraction and sulfuric acid stripping

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2025-06-16 DOI:10.1016/j.hydromet.2025.106521

Liangmin Dong , Fen Jiao , Wei Liu , Zheyi Zhang , Wenqing Qin

{"title":"Separation of aluminum and lithium in sulfuric acid roasting leachate of overhaul slag by Di-(2-ethylhexyl) phosphoric acid extraction and sulfuric acid stripping","authors":"Liangmin Dong , Fen Jiao , Wei Liu , Zheyi Zhang , Wenqing Qin","doi":"10.1016/j.hydromet.2025.106521","DOIUrl":null,"url":null,"abstract":"<div><div>The sulfuric acid roasting – water leaching - solvent extraction process is an effective method for extracting aluminum and lithium from overhaul slag. This study aims to investigate the extraction behavior of di-(2-ethylhexyl) phosphoric acid (P204) of molecular formula C16H35O4P in sulfonated kerosene for Al3+, Li+ in sulfuric acid media. Under the most suitable conditions of pH 2.7, organic and aqueous phase volume ratio (O/A) of 1, P204 concentration of 50 % (v/v), extraction time of 5 min, the selective extraction efficiency of aluminum reached 99.1 % after 3 stages. The loss of lithium was 6.2 %, with a separation factor (β(Al/Li)) of 4295. The aluminum-bearing organic phase was stripped with 20 % sulfuric acid, at an O/A phase ratio of 1. The recovery of aluminum attained 98.6 % after a stripping time of 4 min. Then, the organic phase was recycled and the inorganic phase was prepared to produce Al2(SO4)3. Finally, the high Al3+ concentration of 11.5 g/L in the acid roasting leachate of overhaul slag was reduced to 4.24 × 10−3 g/L.</div></div>","PeriodicalId":13193,"journal":{"name":"Hydrometallurgy","volume":"236 ","pages":"Article 106521"},"PeriodicalIF":4.8000,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Hydrometallurgy","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0304386X25000866","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}

引用次数: 0

Abstract

The sulfuric acid roasting – water leaching - solvent extraction process is an effective method for extracting aluminum and lithium from overhaul slag. This study aims to investigate the extraction behavior of di-(2-ethylhexyl) phosphoric acid (P204) of molecular formula C₁₆H₃₅O₄P in sulfonated kerosene for Al³⁺, Li⁺ in sulfuric acid media. Under the most suitable conditions of pH 2.7, organic and aqueous phase volume ratio (O/A) of 1, P204 concentration of 50 % (v/v), extraction time of 5 min, the selective extraction efficiency of aluminum reached 99.1 % after 3 stages. The loss of lithium was 6.2 %, with a separation factor (β_(Al/Li)) of 4295. The aluminum-bearing organic phase was stripped with 20 % sulfuric acid, at an O/A phase ratio of 1. The recovery of aluminum attained 98.6 % after a stripping time of 4 min. Then, the organic phase was recycled and the inorganic phase was prepared to produce Al₂(SO₄)₃. Finally, the high Al³⁺ concentration of 11.5 g/L in the acid roasting leachate of overhaul slag was reduced to 4.24 × 10⁻³ g/L.

查看原文本刊更多论文

二-（2-乙基己基）磷酸萃取-硫酸汽提分离大修渣硫酸焙烧浸出液中的铝锂

硫酸焙烧-水浸-溶剂萃取工艺是从检修渣中提取铝和锂的有效方法。研究了分子式为C16H35O4P的二-（2-乙基己基）磷酸（P204）在磺化煤油中对硫酸介质中Al3+、Li+的萃取行为。在pH为2.7、有机水相体积比（O/A）为1、P204浓度为50% （v/v）、萃取时间为5 min的条件下，经过3级萃取，铝的选择性萃取效率达到99.1%。锂的损失率为6.2%，分离因子（β(Al/Li)）为4295。含铝有机相用20%硫酸在O/A相比为1的条件下进行剥离。溶出时间为4 min后，铝的回收率达到98.6%。然后将有机相回收，制备无机相制备Al2(SO4)3。最终，大修渣酸焙烧渗滤液中Al3+浓度从11.5 g/L降至4.24 × 10−3 g/L。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.