Extraction of alumina from coal fly ash using an acid leach-sinter-acid leach technique
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- 作者：A. Shemi ; alanshemi@yahoo.co.uk" class="auth_mail" title="E-mail the corresponding author ; S. Ndlovu ; V. Sibanda ; L.D. van Dyk
- 关键词：Coal fly ash ; Aluminium ; Acid leaching ; Sintering
- 刊名：Hydrometallurgy
- 出版年：2015
- 出版时间：October 2015
- 年：2015
- 卷：157
- 期：Complete
- 页码：348-355
- 全文大小：1097 K
文摘
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The process of alumina extraction from CFA involved three stages; acid leach, sinter, and acid leach.
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The first leaching step extracted up to 89.3% aluminium from the amorphous phase in raw CFA.
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The second leaching step extracted up to 84.3% aluminium from the mullite phase in residue-CFA.
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A combination of the first and second leaching steps extracted a total of 88.2% aluminium from CFA.
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Sintering of coal fly ash residue from the first leaching stage was carried out using mixture of CFA with calcium carbonate.