Journal article

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

Research Areas

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Publication Details

Author list: Chiodza G, Harrison S, Fagan-Endres M

Publisher: MDPI

Publication year: 2020

Journal: Minerals

Volume number: 10

Issue number: 1

Start page: 70

Total number of pages: 14

ISSN: 2075-163X

eISSN: 2075-163X



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.


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Last updated on 2021-09-02 at 10:07