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06-02-2024 | Original Article

Flotation separation of feldspar from quartz using sodium fluosilicate as a selective depressant

Authors: Xin Hu, Xian-Ping Luo, Zi-Shuai Liu, Yong-Bing Zhang, He-Peng Zhou, Zhi-Zhao Yang, Xue-Kun Tang

Published in: Rare Metals | Issue 3/2024

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Abstract

The physical and chemical properties of feldspar and quartz are highly similar, thus they cannot be easily separated effectively. In this work, the flotation separation of feldspar from quartz using sodium fluosilicate (Na₂SiF₆; SF) as a selective depressant was investigated. Moreover, the influence mechanism of SF on the selective flotation separation of feldspar and quartz was investigated via flotation tests, chemical analysis of flotation solution, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and contact angle analysis. The results of the flotation tests show that feldspar and quartz without SF treatment have good floatability. After SF treatment, feldspar still has good floatability, whereas quartz has significantly reduced floatability. Flotation solution chemical analysis shows that the functional group plays an important role in depressing the quartz is [SiF₆]²⁻. FTIR, XPS and contact angle analysis results show that [SiF₆]²⁻ is adsorbed only on the surface of quartz. Thus, a thin hydrophilic SiOF layer is generated on the surface, which interferes with the adsorption of the collector on the surface of the quartz. This phenomenon leads to a significant reduction in quartz’s floatability. Therefore, SF has a good ability to separate feldspar from quartz by flotation.

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Title: Flotation separation of feldspar from quartz using sodium fluosilicate as a selective depressant
Authors: Xin Hu
Xian-Ping Luo
Zi-Shuai Liu
Yong-Bing Zhang
He-Peng Zhou
Zhi-Zhao Yang
Xue-Kun Tang
Publication date: 06-02-2024
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 3/2024
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-024-02629-5

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