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Minerals 2017, 7(9), 157;

The Role of Water Glass in the Flotation Separation of Fine Fluorite from Fine Quartz

School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China
Author to whom correspondence should be addressed.
Received: 8 August 2017 / Revised: 22 August 2017 / Accepted: 23 August 2017 / Published: 28 August 2017
(This article belongs to the Special Issue Flotation Chemistry)
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Fluorite is the principal mineral of fluorine and usually coexists with quartz in deposits. The removal of fine quartz in fluorite concentrate is the main problem in fluorite flotation. In this study, the flotation tests on fluorite, quartz and a weight equivalent mixture (all less than 10 μm) using water glass (with different modulus) as depressants and sodium oleate as collector were conducted. The mechanism of fine quartz entering the fluorite concentrate was investigated through optional observations and rheology measurements on the flotation pulp. The particle interactions between fine fluorite and quartz under flotation-related conditions were analyzed through zeta potential measurements and DLVO calculations. The results revealed that there existed strong hetero-coagulation between fluorite and quartz particles in the flotation pulp, which could be the main reason for the quartz entering the fluorite concentrate in the flotation process. Water glass with higher modulus could eliminate the hetero-coagulation more totally but inevitably influences the flotability of fluorite. View Full-Text
Keywords: flotation; water glass modulus; hetero-coagulation; fluorite; quartz flotation; water glass modulus; hetero-coagulation; fluorite; quartz

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Zhang, G.; Gao, Y.; Chen, W.; Liu, D. The Role of Water Glass in the Flotation Separation of Fine Fluorite from Fine Quartz. Minerals 2017, 7, 157.

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