Статья

Enhancing magnetism and magnetic separation of ultrafine chalcopyrite from talc through surface oxidation treatment

Song ZhangFaculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, ChinaLuzheng ChenFaculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, ChinaYang HongZijin School of Geology and Mining, Fuzhou University, Fuzhou, Fujian, 350116, ChinaGuanyu LiangFaculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, ChinaCanneng ChenFaculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, ChinaYongjun XianFaculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, ChinaShuming WenFaculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

2023en

ABI

Аннотация

Magnetic separation has been proposed to greenly separation of chalcopyrite and talc several decades ago, due to their extremely similar floatability. However, this approach was not achieved initially due to the inadequate magnetic induction intensity of traditional magnetic separation, and fine particle size of chalcopyrite. Currently, the development of ultra-highly magnetic induction intensity technology provides strong feasibility for this separation. In this work, we employed pulsating high-gradient magnetic separation (PHGMS) with ultra-highly magnetic induction intensity (1.8T) to separate chalcopyrite and talc, and found that the PHGMS achieves a good separation of chalcopyrite from talc. But the chalcopyrite recovery decreased with the decrease of its particle size, and thus surface oxidation treatment was attempted to increase the magnetism and magnetic capture of ultrafine chalcopyrite. As a result, an increment of approximately 10 % was observed in the recovery of ultrafine chalcopyrite post-oxidation. As verified by the superconducting quantum interference device measurements, the oxidized ultrafine chalcopyrite exhibited a significant increase in the saturation magnetisation intensity, remanent magnetisation and coercivity values. Such magnetism enhancement is a result of the formation of paramagnetic Fe(III)–O–OH structures on the oxidized chalcopyrite surface, in terms of X-ray photoelectron spectroscopy and Mössbauer spectroscopy investigations. Furthermore, the density functional theory revealed that the formation of Fe(III)–O–OH structures caused a substantial increase in the magnetic moments of iron ions in antiferromagnetic chalcopyrite. These findings may extend the application of magnetic separation, and facilitate the flotation of ultrafine chalcopyrite from other minerals, at significantly reduced reagents use, and productive and environmental costs.

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Идентификаторы

DOI: 10.1016/j.jmrt.2023.12.248

Цитирования и источники

Цитирований: 2Использованных источников: 0

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