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Minerals 2016, 6(4), 114; https://doi.org/10.3390/min6040114

Selective Flotation of Calcite from Fluorite: A Novel Reagent Schedule

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
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Academic Editor: William Skinner
Received: 19 August 2016 / Revised: 21 October 2016 / Accepted: 24 October 2016 / Published: 26 October 2016
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Abstract

Fluorite is an important strategic mineral. In general, fluorite ores will contain a certain amount of calcite gangue mineral. Thus, they need to be separated from each other. For an economic separation, a reverse flotation process is used to float calcite gangue from fluorite. However, little information on the separation is available. In this study, a novel reagent schedule using citric acid (CA) as the depressant, sodium fluoride (NaF) as the regulator and sulfoleic acid (SOA) as the collector, was developed to separate calcite from fluorite. The results demonstrated a high selectivity for the flotation of calcite from fluorite using this new reagent schedule. The best selective separation for a single mineral and mixed binary minerals was obtained when 200 mg/L of NaF, 50 mg/L of CA, and 6 mg/L of SOA were used at pH 9. In addition, a batch flotation experiment was carried out using a run-of-mine feed material. Selective separation was achieved with 85.18% calcite removal while only 11.2% of fluorite was lost. An attempt was made to understand the effect of the new reagent schedule on the flotation of calcite. The results from both microflotation and bench scale flotation demonstrated a great potential for industrial application using this novel reagent schedule to upgrade fluorite ore. View Full-Text
Keywords: fluorite; calcite; flotation; citric acid; sodium fluoride; sulfoleic acid fluorite; calcite; flotation; citric acid; sodium fluoride; sulfoleic acid
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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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Gao, Z.; Gao, Y.; Zhu, Y.; Hu, Y.; Sun, W. Selective Flotation of Calcite from Fluorite: A Novel Reagent Schedule. Minerals 2016, 6, 114.

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