Use of centrifugal-gravity concentration for rejection of talc and recovery improvement in base-metal flotation |
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Authors: | Bern Klein Naci Emre Altun Hassan Ghaffari |
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Affiliation: | 1. NBK Institute of Mining Engineering, The University of British Columbia, 6350 Stores Road, Vancouver, V6T 1Z4, BC, Canada;2. Department of Mining Engineering, Middle East Technical University, 06800, Ankara, Turkey;3. Tetra Tech, Metal urgy, 885 Dunsmuir Street, Ste 1000, V6C1N5, Vancouver, BC, Canada |
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Abstract: | The possibility of using a centrifugal-gravity concentrator to reject Mg-bearing minerals and minimize metal losses in the flotation of base metals was evaluated. Sample characterization, batch scoping tests, pilot-scale tests, and regrind-flotation tests were conducted on a Ni flotation tailings stream. Batch tests revealed that the Mg grade decreased dramatically in the concentrate products. Pilot-scale testing of a continuous centrifugal concentrator (Knelson CVD6) on the flotation tailings revealed that a concentrate with a low mass yield, low Mg con-tent, and high Ni upgrade ratio could be achieved. Under optimum conditions, a concentrate at 6.7%mass yield was obtained with 0.85%Ni grade at 12.9%Ni recovery and with a low Mg distribution (1.7%). Size partition curves demonstrated that the CVD also operated as a size classifier, enhancing the rejection of talc fines. Overall, the CVD was capable of rejecting Mg-bearing minerals. Moreover, an opportunity exists for the novel use of centrifugal-gravity concentration for scavenging flotation tailings and/or after comminution to minimize amount of Mg-bearing minerals reporting to flotation. |
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Keywords: | flotation base metals talc centrifugation gravity concentrators |
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