Process for improved separation of sulphide minerals or middling

Classifying – separating – and assorting solids – Fluid suspension – Liquid

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209167, 209 1, 241 2412, 241 2425, B03D 106

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active

057954666

ABSTRACT:
A multi-stage froth flotation process is provided for concentrating sulphide minerals or middlings containing non-ferrous metal values such as nickel, cobalt and copper, which co-exist with significant amounts of pyrrhotite. The process is carried out without relying on any specific reagent as pyrrhotite depressant, but rather by exploiting the natural pulp environment with low REDOX potentials generated by mild steel grinding media in the grinding step preceding the froth flotation. The concentrate from the flotation stage(s) in which the REDOX potential rises above a predetermined value, is recycled back to the grinding step and/or to preceding flotation stage(s) from which concentrate is collected as the final product or is subjected to an up-grading in a further cleaning stage.

REFERENCES:
patent: 1290166 (1919-01-01), Gahl
patent: 3655044 (1972-04-01), Delany
patent: 3883421 (1975-05-01), Cutting et al.
patent: 4585549 (1986-04-01), Malghan
S. Chander and D.W. Fuerstenau, "Electrochemical Flotation Separation of Chalcocite From Molybdenite", International Journal of Mineral Processing, 1983, pp. 89-94, vol. 10, Elsevier Scientific Publishing Company, Amsterdam.
Wang Qun and K. Heiskanen, "Separation of pentlandite and Nickel Arsenide Minerals by Aeration Conditioning Flotation", International Journal of Mineral Processing, 1990, pp. 99-109, vol. 29, Elsevier Science Publishers B.V., Amsterdam.
J.H. Ahn and J.E. Gebhardt, "Effect of Grinding Media-Chalcopyrite Interaction on the Self-Induced Flotation of Chalcopyrite", International Journal of Mineral Processing, 1991, pp. 243-262, vol. 33, Elsevier Science Publishers B.V., Amsterdam.
S. Kelebek, "The Effect of Oxidation on the Flotation Behaviour of Nickel-Copper Ores", XVIII International Mineral Processing Congress, 1993, pp. 999-1005.

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