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Open AccessArticle

Algal Lipids as Biocollector for Recovery of Coal from Fine Coal Waste by Froth Flotation

Centre for Bioprocess Engineering Research, Department of Chemical Engineering, University of Cape Town, South Lane, Rondebosch, Cape Town 7700, South Africa
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Minerals 2020, 10(1), 70; https://doi.org/10.3390/min10010070
Received: 3 December 2019 / Revised: 11 January 2020 / Accepted: 14 January 2020 / Published: 16 January 2020
Raw algal lipids (RALs) and their derivatives (fatty acid methyl esters; FAMEs) were investigated as biocollectors for the recovery of coal from ash-rich fine coal waste by froth flotation. Testing was done on fine coal discards from two South African sites—a high ash (50%), high sulphur (5.7%) sample and a lower ash (26%), low sulphur (0.91%) sample. The yield and recovery of combustibles on using biocollectors was similar to, or better than, with oleic acid, a polar collector demonstrated as a good collector in previous research. The RALs and FAMEs reduced the ash and sulphur content of the combustible fraction of the high ash-high sulphur sample to between 23–28% and 1.9–3.3%, respectively. The chemical modification of RALs to FAMEs provided potential for improving the selectivity of the recovery of combustibles. It also resulted in a change of the optimum operating pH, with RALs yielding better results at the natural pH of the sample (pH 2.7), while FAMEs performed best at pH 7. View Full-Text
Keywords: flotation; biocollector; algae; lipids; coal; tailings; waste; valorisation flotation; biocollector; algae; lipids; coal; tailings; waste; valorisation
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MDPI and ACS Style

Chiodza, K.G.; Harrison, S.T.L.; Fagan-Endres, M.A. Algal Lipids as Biocollector for Recovery of Coal from Fine Coal Waste by Froth Flotation. Minerals 2020, 10, 70.

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