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

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

Chair of Non-Ferrous Metals and Gold, National University of Science and Technology “MISiS”, Moscow, Russia:
A. N. Fedorov, Professor

The actual processing technology for semiproducts and recycled materials is based on usage of blast contractile smelting and is characterized by low copper, lead and zinc extraction in the finished products. Essential concentration of arsenic and antimony in these products stipulates their low quality. To improve this technology, it is proposed to change the type and composition of initial charge material via replacing of copper-zinc ore by high-sulphuric copper-zinc concentrate. Principal possibility of direct concentrate processing with its simultaneous usage as a sulphidizer for depletion of non-ferrous metal slags is shown. Thermodynamical analysis of the main interaction reactions for slag components and copper-zinc concentrate is conducted. The values of Gibbs free energy and constants of reactions in the temperature range 1073–1573 K have been established based on thermodynamical calculations of the reactions describing the main physical and chemical processes during blast contractile smelting. The mechanism of interaction between oxides of non-ferrous metals and iron (from one side) and concentrate components (from other side) has been revealed. It is displayed that sulphidizing of arsenic and antimony oxide is achieved in the case of their interaction with elementary sulphur and iron sulphide. High possibility of conducting of these reactions provides deep arsenic and antimony distillation in dust, in the form of non-toxic sulphides. Usage of the proposed technical solution will decrease substantially the effect on the environment, improve technological operating parameters owing to lowering of loss of non-ferrous metals with slag and matte, as well as improve quality of finished products.

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