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Minerals 2018, 8(6), 227; https://doi.org/10.3390/min8060227

Selective Flocculation Separation of Fine Hematite from Quartz Using a Novel Grafted Copolymer Flocculant

1
College of Mining Engineering, North China University of science and technology, Tangshan 063210, China
2
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
3
Department of Chemical Engineering, Michigan Technological University, Houghton, MI 49931, USA
*
Authors to whom correspondence should be addressed.
Received: 30 April 2018 / Revised: 20 May 2018 / Accepted: 23 May 2018 / Published: 28 May 2018
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Abstract

Beneficiation of ultrafine mineral particles (typically with an average size less than 20 µm) remains a critical problem for the mineral processing industry. Selective flocculation technique has been found to show great potential to tackle this problem, whose success mainly depends on the selective adsorption of a flocculant on the target mineral particles. In this work, a novel copolymer flocculant was synthesized by grafting starch and acrylamide, which for the first time, was employed in the flocculation separation of fine hematite from quartz. The composites of the grafted copolymer flocculant (GCF) were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The single mineral flocculation results showed that at the pH of 10–11 and GCF concentration of 125 mg/L, hematite flocs with a compact texture were formed, whose average diameter and fractal dimension reached 36 µm and 2.02, respectively; while quartz flocs were barely observed, and the average diameter of particles stayed at approximately 20 µm. Furthermore, the selective flocculation separation was confirmed in the mixed mineral flocculation. From adsorption tests and zeta potential measurements, it is shown that GCF tended to adsorb more selectively and intensely on hematite surfaces compared with quartz. This study provides a valuable reference for the efficient recovery of fine hematite particles. View Full-Text
Keywords: Hematite; quartz; grafted copolymer flocculant; flocculation; fine particles Hematite; quartz; grafted copolymer flocculant; flocculation; fine particles
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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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Zhang, J.; Sun, W.; Gao, Z.; Niu, F.; Wang, L.; Zhao, Y.; Gao, Y. Selective Flocculation Separation of Fine Hematite from Quartz Using a Novel Grafted Copolymer Flocculant. Minerals 2018, 8, 227.

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