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Minerals 2016, 6(3), 86;

Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores

1,2,3,* , 1,2,3
College of Resource and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan 430081, China
Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources, Wuhan 430081, China
Author to whom correspondence should be addressed.
Academic Editor: Kota Hanumantha Rao
Received: 13 May 2016 / Revised: 9 August 2016 / Accepted: 12 August 2016 / Published: 23 August 2016
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Simple magnetic separation for a certain magnetite mine with ultrafine disseminated lean ores has resulted in low performance, as the fine sizes and aggregation of ground mineral particles have caused inefficient recovery of the ultrafine minerals. In this study, we attempt to increase the apparent sizes of target mineral particles, and improve the separation indices, by using a multi-stage grinding-dispersion-selective flocculation-weak magnetic separation process. The results showed that under the conditions of 500 g/t sodium hexametaphospate (SHMP) as dispersant, 750 g/t carboxymethyl starch (CMS) as flocculant, agitating at 400 rpm for 10 min, with slurry pH 11, and final grinding fineness of 93.5% less than 0.03 mm, the obtained concentrate contained 62.82% iron, with recovery of 79.12% after multi-stage magnetic separation. Compared to simple magnetic separation, the concentrate’s iron grade increased by 1.26%, and a recovery rate by 5.08%. Fundamental analysis indicated that, in a dispersed state of dispersion, magnetite particles had weaker negative surface charges than quartz, allowing the adsorption of negative CMS ions via hydrogen bonding. Consequently, the aggregate size of the initial concentrate increased from 24.30 to 38.37 μm, accomplishing the goal of selective flocculation, and increasing the indices of separation. View Full-Text
Keywords: magnetite; ultrafine dissemination; magnetic separation; selective flocculation magnetite; ultrafine dissemination; magnetic separation; selective flocculation

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Su, T.; Chen, T.; Zhang, Y.; Hu, P. Selective Flocculation Enhanced Magnetic Separation of Ultrafine Disseminated Magnetite Ores. Minerals 2016, 6, 86.

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