Aluminium recovery from coal fly ash for the production of high purity alumina

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

Hydrometallurgy Pub Date : 2025-09-06 DOI:10.1016/j.hydromet.2025.106573

Cameron J. Johnston , Rachel A. Pepper , Wayde N. Martens , Sara J. Couperthwaite

引用次数: 0

Abstract

The vast scale of coal combustion worldwide has led to large amounts of fly ash (waste product) being produced. One method of dealing with this waste is using it as a feedstock for new processes, such as producing high purity alumina (HPA: >99.99 % Al₂O₃). The research presented demonstrates a method of recovering aluminium from coal fly ash for the synthesis of high purity alumina. The method involves: (1) a caustic fusion method that converts mullite into soluble sodalite phase, (2) a pH adjustment to concentrate aluminium, (3) a purification stage using hydrochloric acid crystallisation, and (4) calcination at 1250 °C to convert aluminium chloride hexahydrate crystals to α-Al₂O₃. This method produced HPA with an alumina purity of 99.99 %.

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从粉煤灰中回收铝生产高纯氧化铝

世界范围内大规模的煤炭燃烧产生了大量的粉煤灰（废料）。处理这种废物的一种方法是将其用作新工艺的原料，例如生产高纯度氧化铝（HPA: 99.99% Al2O3）。介绍了一种从粉煤灰中回收铝制备高纯氧化铝的方法。该方法包括：(1)苛性碱熔合法，将莫来石转化为可溶的钠石相；(2)调整pH值以浓缩铝；(3)使用盐酸结晶的净化阶段；(4)在1250°C下煅烧，将六水氯化铝晶体转化为α-Al2O3。该方法制得氧化铝纯度为99.99%的HPA。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.