Chair of Metallurgy of Non-ferrous Metals of Kazakh National Technical University after K. I. Satpayev, Almaty, Kazakhstan:

N. K. Dosmukhamedov, Professor, e-mail: nurdos@bk.ru

Chair of Non-ferrous Metals and Gold of National University of Science and Technology “MISiS”, Moscow, Russia:
E. E. Zholdasbay, Master's Student
A. N. Fedorov, Professor

Chair of Metallurgy of Noble Metals and Mineral Processing of Kazakh National Technical University after K. I. Satpayev, Almaty, Kazakhstan:
M. R. Shautenov, Assistant Professor

Zh. Zh. Kabylbekov, Assistant of a Chair of Non-Ferrous Metals and Gold of National University of Science and Technology “MISiS” took part in the study.

Involvement to processing of complex mineralogical and chemical composition of polymetallic ores and concentrates dramatically increased the volume of produced sulfide middlings and oxidized recycled materials characterized by complex chemical and phase composition. High concentration of metal impurities in these products considerably complicated their processing. The search for highly effective ways of processing of sulphide middlings and oxidized materials to further extraction of precious metals is a significant reserve of improving technological and economic performance of enterprises. For lead companies in Kazakhstan the solution of this problem obtains particular importance and urgency, where there is the highest yield of intermediates and circulating oxidized materials. In this paper, on the basis of thermodynamic calculations of the Gibbs free energy reactions occurring between the components of sulphide middlings and oxidized materials under intense bubbling melt, profound possibility of separate joint recycling is justified by sequentially blowing liquid-alloy with air and natural gas. The results of the industrial balance heats fully confirmed the accuracy of thermodynamic calculations and allowed to determine the optimum process parameters technology to ensure high recovery of valuable metals in the desired products. It was specified that the best technological parameters for extraction of non-ferrous metals and related products to the target are achieved by melting a balanced blend with a ratio of oxidized sulfide materials and middlings of 0.3:1. This ensures a high selective extraction of valuable metals as lead and precious metals in bullion to 97 and 98%, proper; copper matte — 90%; zinc in slag — 90%; arsenic, antimony and rhenium dust — 97 and 98%, proper.

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