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Minerals 2018, 8(8), 313;

Reverse Flotation Separation of Fluorite from Calcite: A Novel Reagent Scheme

Department of Minerals Engineering, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China
Department of Chemical Engineering, College of Mines and Earth Sciences, Michigan Technological University, Houghton, MI 49931, USA
J.W. and Z.Z. contributed equally to this work.
Author to whom correspondence should be addressed.
Received: 17 June 2018 / Revised: 12 July 2018 / Accepted: 22 July 2018 / Published: 26 July 2018
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Fluorite (CaF2), as an important strategic mineral source, is usually separated from calcite by the common froth flotation method, but this separation is still not selective enough. The development of a selective collector and/or depressant is the key to achieving high selective separation. 1-Hydroxyethylidene-1,1-diphosphonic acid (HEDP or H4L) is widely used as an environmentally friendly water treatment reagent due to its low cost and excellent anti-scaling performance in an aqueous solution. In this study, a novel reagent scheme was developed using HEDP as a fluorite depressant and sodium oleate (NaOL) as a calcite collector for the first time. When 3 × 10−5 mol/L of HEDP and 6 × 10−5 mol/L of NaOL were used at pH 6, the optimal selective separation for single minerals and mixed binary minerals was obtained. Zeta potential measurements indicated that HEDP possessed a stronger adsorption on fluorite than calcite, while NaOL did the opposite. This novel reagent scheme is of low cost, uses a small dosage, and is friendly to the environment, which makes it a promising reagent scheme for fluorite flotation in industrial application. View Full-Text
Keywords: fluorite; calcite; flotation; 1-hydroxyethylidene-1,1-diphosphonic acid; sodium oleate fluorite; calcite; flotation; 1-hydroxyethylidene-1,1-diphosphonic acid; sodium oleate

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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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Wang, J.; Zhou, Z.; Gao, Y.; Sun, W.; Hu, Y.; Gao, Z. Reverse Flotation Separation of Fluorite from Calcite: A Novel Reagent Scheme. Minerals 2018, 8, 313.

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