Baikal Institute of Nature Management, Siberian Branch (SB) of the Russian Academy of Sciences (RAS) (Russia):

Antropova I. G., Ph. D. in Engineering Sciences, Head of Laboratory, inan@binm.bscnet.ru
Dambaeva A. Yu., Engineer
Danzheeva T. Zh., Engineer, tuianochka@gmail.com

The results of the Ozyornoye polymetallic deposit crust of weathering two process samples material composition study and sulfidizing steam roasting application in oxidized ores preparation for flotation testing are presented. It was established, that at least two native ore types are distinguished at the deposit. It was shown, that one of the samples characterizes polymetallic ore sulfate oxidation stage, with plumbojarosite (PbFe₆(OH)₁₂(SO₄)₄) being the main lead-bearing mineral. The second sample characterizes carbonate stage, with cerussite (PbCO₃) as the main lead-bearing mineral. Zinc mass fraction in the samples is below 1 %, and it is one of minor recovered components. A possibility for hard-toprocess oxidized lead-bearing minerals deep sulfidizing by means of their roasting with pyrite concentrate in overheated steam atmosphere was ascertained. The optimal conditions of sulfidizing roasting, providing for maximum transition of lead oxides into sulfide forms, were identified for each type of oxidized ores. A process flow diagram is proposed for the Ozyornoye deposit oxidized ore beneficiation by a combination method. It includes sulfidizing roasting, ultrasonic treatment of sulfidized material and non-cyanic sulfide flotation. The developed process of oxidized ores pyro-sulfidizing permits to efficiently transform mineral composition of ore valuable components, providing for lead recovery increase over 90 %.

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