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ArticleName Technology of Co-enrichment of primary and technogenic copper-nickel raw materials
DOI 10.17580/tsm.2018.05.02
ArticleAuthor Evdokimov S. I., Gerasimenko T. E.

North-Caucasian Mining and Metallurgical Institute (State Technological University), Vladikavkaz, Russia:

S. I. Evdokimov, Associate Professor of the Department of Mineral processing, e-mail:
T. E. Gerasimenko, Associate Professor of the Department of Technological Machines and Equipment


The enrichment technology for both the impregnated ores of the Norilsk-1 deposit and the slag of Copper Plant was developed. A new configuration of the enrichment scheme is proposed: a rough concentrate is first extracted from the half part of the raw material (the first flotation stream), and then, it is mixed with the second half part of the raw materials (the second flotation stream), thus enabling the production of finished crude concentrate. Increasing the steepness of separation characteristics and the quality of the fractional composition of the raw materials due to mixing o f the feedstock and the crude concentrate wa found to be responsible for the enhanced recovery of valuable components. In the second flotation stream, a mixture of air and hot water steam called a steamair mixture is used as the gas phase. In the flotation stage by the steam-air mixture, the boundary layers of bubbles are heated by the heat of condensation. According to the Cassie-Baxter state model, an air layer is retained in the form of nano- and microbubbles during wetting of the minerals surfaces in the cavities of their relief. The physical consequence of the conjugate heat and mass transfer during condensation and vapor evaporation in bubbles is their coalescence with surface nanobubbles, i.e. the formation of a flotocomplex by the most efficient mechanism — coalescent. The driving factor providing a change in the stability of wetting films with increasing temperature of the boundary layer of bubbles and the result of flotation is the surface forces of structural origin with the participation of the surface layer of air. Application of the developed technology allows increasing the extraction of copper and nickel in similar concentrates by more than 5%. The possibility of joint enrichment of ores and slags is presented and discussed.

keywords Copper-nickel ores, slags, co-processing, flotation flow scheme, steamair mixture, flotation mechanism

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