Cameron J. Johnston , Rachel A. Pepper , Wayde N. Martens , Sara J. Couperthwaite
{"title":"从粉煤灰中回收铝生产高纯氧化铝","authors":"Cameron J. Johnston , Rachel A. Pepper , Wayde N. Martens , Sara J. Couperthwaite","doi":"10.1016/j.hydromet.2025.106573","DOIUrl":null,"url":null,"abstract":"<div><div>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 % Al<sub>2</sub>O<sub>3</sub>). 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-Al<sub>2</sub>O<sub>3</sub>. This method produced HPA with an alumina purity of 99.99 %.</div></div>","PeriodicalId":13193,"journal":{"name":"Hydrometallurgy","volume":"238 ","pages":"Article 106573"},"PeriodicalIF":4.8000,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Aluminium recovery from coal fly ash for the production of high purity alumina\",\"authors\":\"Cameron J. Johnston , Rachel A. Pepper , Wayde N. Martens , Sara J. Couperthwaite\",\"doi\":\"10.1016/j.hydromet.2025.106573\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>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 % Al<sub>2</sub>O<sub>3</sub>). 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-Al<sub>2</sub>O<sub>3</sub>. This method produced HPA with an alumina purity of 99.99 %.</div></div>\",\"PeriodicalId\":13193,\"journal\":{\"name\":\"Hydrometallurgy\",\"volume\":\"238 \",\"pages\":\"Article 106573\"},\"PeriodicalIF\":4.8000,\"publicationDate\":\"2025-09-06\",\"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/S0304386X25001380\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Hydrometallurgy","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0304386X25001380","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}
Aluminium recovery from coal fly ash for the production of high purity alumina
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 %.
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.