Ural Mining and Metallurgical Company, Verkhnyaya Pyshma, Sverdlovsk Oblast, Russia

A. M. Panshin, Technical Officer

Institute of Materials Science and Metallurgy, Chair of Metallurgy of Heavy Non-Ferrous Metals, Ural Federal University named after the first president of Russia B. N. Yeltsin, Ekaterinburg, Russia

O. S. Anisimova, Assistant Professor
S. V. Mamyachenkov, Professor, e-mail: svmamyachenkov@yandex.ru
S. V. Karelov, Professor

There are shown the prospects for expanding of raw materials base of zinc production due to the usage of oxidized anthropogenic wastes in the Waelz process charge. Oxidized anthropogenic wastes are the dusts of electric arc fusion of secondary steel, which distinctive feature is the high content of halogens (chlorine and fluorine) and iron compounds in it. Water-soda washing of Waelz oxides is connected with the following factors:
— high consumption of industrial water (up to 10 m³/t);
— difficulties in utilization of zinc production of obtained zinccadmium carbonate residue in the basic scheme;
— considerable cost of purification of obtained hazardous flows.

Single-stage distillation of up to 90% of chlorine and fluorine into the concentrated lead product with rather low temperature (up to 700 ^оС) is possible due to the secondary oxidation roasting of Waelz oxides with high content of halogenides. The roasting also makes it possible to oxidize the sulphide sulphur, iron and arsenic to the highest oxidation degree compounds. The obtained calcined product with a rich content of zinc has bigger bulk weight, than original Waelz oxide, which facilitates the subsequent leaching and reduces the consumption of reagents and water. Elemental and, especially, phase composition of oxidizing calcination sublimates is very important for optimization of subsequent operations of leaching of calcined Waelz oxide and processing of these oxidizing calcination sublimates. On the basis of phase composition of oxidizing calcination sublimates, it is possible to forecast the indices of hydrometallurgical operations, following after the calcination, and their effective and efficient management. There are given the results of elemental energy dispersion and phase analysis of middlings of prospective technology of two-stage Waelz process of zinc-containing dusts of electric arc steel making. There are defined the main phases, included into the Waelz process clinker of electric arc furnace dusts, calcinated Waelz oxide and secondary sublimates of its oxidation calcination.

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