Extraction of alumina from coal fly ash generated from a selected low rank bituminous South African coal

By R. Matjie, J. Bunt, J. V. Heerden. 2005

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A review of the alumina recovery from coal fly ash, with a focus in China (2014, background): “[65] calcined fly ash with CaO at a temperature range of 1000–1200 C.”
Recovery of metals and other beneficial products from coal fly ash: a sustainable approach for fly ash management (2016, methodology): “Recently, Matjie et al. (2005) discussed this calcinated technique at high temperature to decompose mullite phases, and then the calcinated CFA was leached in sulfuric acid to produce a solution containing Fe, Al and Ti species.”
Extraction of aluminum by pressure acid-leaching method from coal fly ash (2012, methodology): “BAI et al [17] and MATJIE et al [18] represented that the aluminum extraction efficiency by acid leaching method can be improved through adding calcium oxide (or calcium sulfate or lime) in coal fly ash and calcining the mixture at high temperature before acid-leaching reaction.”