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Towards cleaner production: Using flotation to recover monazite from a heavy mineral sands zircon waste stream
Luleå tekniska univesitet.
Chemical Engineering, University of Cape Town, South Africa.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
Chemical Engineering, University of Cape Town, South Africa.
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Number of Authors: 5
2017 (English)In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 101, 30-39 p.Article in journal (Refereed) Published
Abstract [en]

In line with the principles of cleaner production, the removal of monazite via reverse flotation was investigated with a view to reducing the radioactivity of a heavy mineral sands waste stream. Another benefit was to create a potential REE by-product from the Namakwa Sands operation in South Africa. Understanding the mineralogy of the zircon waste stream was essential owing to the cemented nature of the deposit and the potential impact of surface coatings on the flotation performance. SEM, QEMSCAN and optical microscopy showed that amorphous SiO2 was the most abundant surface coating associated with both monazite and zircon, which is likely to constitute a major challenge in achieving flotation selectivity. A D-optimal statistical screening design was applied to find the most relevant flotation parameters and a full factorial design to find the optimal flotation conditions. The most promising results showed that monazite could be successfully removed from the zircon waste with an oleate collector at pH 10. The selectivity was found to be highly dependent on pH, with no selectivity at pH 9 and no mineral flotation at pH 11. Further work is recommended to confirm and optimise these conditions and test them on a larger scale.

Place, publisher, year, edition, pages
2017. Vol. 101, 30-39 p.
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
URN: urn:nbn:se:ltu:diva-60639DOI: 10.1016/j.mineng.2016.10.011ISI: 000392044600004ScopusID: 2-s2.0-85006733679OAI: diva2:1049006

Validerad; 2017; Nivå 2; 2017-01-09 (andbra)

Available from: 2016-11-23 Created: 2016-11-23 Last updated: 2017-02-10Bibliographically approved

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