UPDATING OF PROCESSING METHODS OF ZINC-CONTAINING DUST AND SLUDGE FROM BLAST FURNACE AND STEELMAKING PRODUCTION

The paper presents a comparative analysis of processing of zinc-containing dusts and sludge from blast furnace and steelmaking enterprises in domestic and foreign steel industry. The relevance of the research topic is determined by a significant increase in the zinc content in fine distillates of steelmaking in the last decade due to the increased volume of processing of zinc-containing scrap. The increased zinc content in metallurgical dust does not allow them to be used as additives to the metallurgical charge due to the negative effect on the melting process and melting equipment. As a result, it is necessary to withdraw and store a large amount of valuable iron and zinc–containing man-made raw materials with significant economic losses and additional environmental burden.The analysis of mastered and promising technological processes for the extraction of zinc from fine waste was performed. It seems that the process of isolation of technical zinc oxide during the reduction melting of cast iron in an electric furnace, developed by NUST “MISIS” employees, and a technology including preliminary high-temperature preparation of zinc-containing slurries in a tubular furnace followed by alkaline leaching of clinker and the release of metallic zinc and iron-containing concentrate, developed by the Non-state higher Educational Establishment “UMMC Technical University”, deserve the most attention for improvement and replication and tested in the conditions of Chelyabinsk Zinc Plant JSC. The significant advantages of the latest technological scheme include the possibility of implementing it according to the modular principle and using standard domestic equipment. The estimated capital costs for the construction of a module with a capacity of 100 000 tonnes per year of metallurgical sludge amount to 993.5 million rubles with a payback period of about 3 years.

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