Abstract
Purification of sphalerite concentrate in the chemical and flotation way In this paper the results of the investigation of magnesium removal, from zinc concentrate derived from zinc-lead ore enrichment plant, have been presented. The characteristics of the initial concentrate and the occurrence forms of dolomite in this material are estimated. It was found that magnesium is collected in the finest fraction of the initial material. The influence of chemical treatment and flotation on the quality improvement of zinc concentrate is determined. This method permits to obtain zinc concentrate containing below 0,3% Mg and about 0,7% Ca.
Highlights
Sphalerite concentrates from domestic zinc and lead ore deposits contain an admixture of dolomite
Dolomite occurred in the concentrate in two forms: as free grains, generally not more than 10 μm and as intergrowths with sphalerite, intramineral intergrowths included. By this account decreasing of magnesium content in the sphalerite concentrate will not be possible by means of pre-leaching with acid solutions
The level of impurities content in zinc concentrate obtained by means of chemical treatment, using sulphuric acid or phosphoric acid solutions as leaching agent, as well as the cleaning flotation, is comparable
Summary
Sphalerite concentrates from domestic zinc and lead ore deposits contain an admixture of dolomite. The results obtained by the authors[1,2,3,4] during their research do prove that the larger part of magnesium passes to the solution as well as the part of zinc and other components included in the initial material. During this chemical treatment gypsum is formed, which decreases the content of zinc in the concentrates and causes some disturbances in the process of zinc obtaining. The goal of this work is magnesium removal from sphalerite concentrate in the chemical and flotation way, using phosphoric acid solution as the leaching agent. The data listed are average values from at least three identical experiments
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