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Recycling Steelmaking Waste and Producing Zn Concentrate
“Utilization of Russian metallurgy enterprises waste is among the most promising directions of further development of the industry”, said Magnezit Group CEO, Sergei Odegov. “This is valuable raw material whose returning into the production cycle will essentially decrease the environmental load and preserve mineral wealth for future generations”. Andrei Panshin, General Director of Chelyabinsk Zinc Plant said: “Why go into the mine after metal when it lies on the surface as production waste? In the whole civilized world the problem is solved exactly like that. There are enterprises in Poland, Germany for reprocessing such kinds of raw materials and we go in that direction”. In today’s world one of the most popular and highly effective technologies of EAF dust reprocessing is by the waelz method in rotary kilns. 80 % of all dust is processed in such a way. In specialists’ opinion the waelz process is the most progressive and environmentally safe technology. As a result of modernization and technological upgrading at the Satka production site in enterprises of the group the rotary kilns, put out of action, are now used for production of refractories and are basic units for the waelz process. Magnezit Group has capacities for processing up to 200 000 t/a of EAF dust. The project will allow the company to diversify production, use the capacity reserve formed in the process of complex modernizing and create up to 300 new jobs. Under the project, kilns will be partly reconstructed including installation of an up-to-date gas-cleaning plant corresponding to European standards of environmental safety in industry. The dust collected in scrubber cells of steelmaking furnaces is stored at production sites of enterprises and the collected dust volumes are huge. By expert estimates, EAF waste of steelmaking contains from 7 to 25 % of zinc, nickel and other metal oxides. With introduction of new steelmaking capacities the generated dust quantity will grow. The high concentration of metallurgy enterprises in Ural region is the project’s advantage. Reprocessing of industrial waste will give an additional impetus to development of the resource base of the region’s enterprises. Creation of new jobs and environmental improvement will also positively influence the social stability in the South Urals and other industrial regions of Russia. (CN 03/2011)
