Experimental Study on Flotation of Fluorite-Calcite Symbiotic Ore
Flotation tests were carried out for a fluorite-calcite symbiosis ore containing 31.09％CaF2 and 53.23％CaCO3,with the predominately valuable mineral of fluorite,and the dominantly gangue minerals of calcite,quartz and feldspar.After being milled to a fineness of-0.074 mm 75％,the ore was processed with acidized sodium silicate and EM-318 as depressants and EM-OL-3 as collector.Adopting a close-circuit flowsheet consisting of two stages of roughing,one stage of scavenging and eight stages of cleaning,a fluorite concentrate grading 97.26％CaF2 at 86.55％recovery can be obtained.Qualified as an acid-grade fluorite powder(with grade FC-97A)according to the Industry Standard for Ferrous Metallurgy(YB/T 5217-2005(Fluorspar)),this fluorite concentrate can be used as the raw material in high-end fluorine chemical industry.
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