Kimberlite weathering : effects of organic reagents

Show simple item record Ndlovu, Bongani Morkel, Jacqueline Naude, Natasia 2014-07-04T05:52:17Z 2014-07-04T05:52:17Z 2014-03
dc.description.abstract Kimberlite material is one of the primary sources of diamonds. Accelerated weathering that leads to a physical breakdown of the material over a short period of time has possible benefits in diamond processing such as reduction in the energy consumption when used as a pre-comminution stage. This study investigated accelerated weathering by utilising organic reagents; acetic acid, ethanol, formamide, n-hexane, oxalic acid, and urea, in comparison to the use of Cu2+ solution that was previously shown to be very effective in weathering kimberlite. Oxalic acid was the organic agent that showed promising weathering capabilities. However, the use of organic solutions was not as efficient as with Cu2+ solutions. Results showed that 67% of the particles passed 12 mm screen size in Cu2+ weathering compared to 48% in oxalic acid. It was also found that time of exposure had a small effect on weathering. Increasing the organic chemical concentration twofold, from 0.025 M to 0.5 M, improved weathering by 20% points. Different weathering mechanisms were observed at different solution concentration between oxalic acid (1st to 2nd order) and Cu2+ (2nd to 3rd order). en_US
dc.description.librarian hb2014 en_US
dc.description.sponsorship De Beers Group en_US
dc.description.uri en_US
dc.identifier.citation Ndlovu, B, Morkel, J & Naudé, N 2014, 'Kimberlite weathering : effects of organic reagents; Minerals Engineering, vol. 57, no. 3, pp. 68-71. en_US
dc.identifier.issn 0892-6875 (print)
dc.identifier.issn 1872-9444 (online)
dc.identifier.other 10.1016/j.mineng.2013.12.014
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.rights © 2013 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Minerals Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Minerals Engineering, vol. 57, no.3, pp. 68-71, 2014. doi : 10.1016/j.mineng.2013.12.014. en_US
dc.subject Kimberlite en_US
dc.subject Organic weathering en_US
dc.subject Oxalic acid en_US
dc.title Kimberlite weathering : effects of organic reagents en_US
dc.type Postprint Article en_US

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