Use of centrifugal-gravity concentration for rejection of talc and recovery improvement in base-metal flotation

Date

2016-08-01

Author

Klein, Bern
Altun, Naci Emre
Ghaffari, Hassan

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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 content, 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.

Subject Keywords

Flotation, Base metals, Talc, Centrifugation, Gravity concentrators

URI

https://hdl.handle.net/11511/39987

Journal

INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS

DOI

https://doi.org/10.1007/s12613-016-1301-5

Collections

Department of Mining Engineering, Article

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Citation Formats

B. Klein, N. E. Altun, and H. Ghaffari, “Use of centrifugal-gravity concentration for rejection of talc and recovery improvement in base-metal flotation,” INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS, pp. 859–867, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39987.