Comprehensive Analysis of the Physicochemical Properties of Metallurgical Dust for Determining the Main Directions of it
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COMPREHENSIVE ANALYSIS OF THE PHYSICOCHEMICAL PROPERTIES OF METALLURGICAL DUST FOR DETERMINING THE MAIN DIRECTIONS OF ITS REPROCESSING E. O. Bogdan,1, 2 Yu. G. Pavlyukevich,1 P. S. Larionov,1 N. N. Gundilovich,1 and A. A. Chernik1 Translated from Steklo i Keramika, No. 5, pp. 26 – 34, May, 2020. The chemical and phase compositions and the properties of metallurgical dust were studied and its structure and granulometric composition were determined. The physicochemical processes occurring during heat-treatment of the dust in the temperature interval 20 – 1200°C were studied. The main directions for reprocessing of the investigated dust for purposes of obtaining useful products are proposed on the basis of the performed studies. Key words: metallurgical dust, chemical composition, phase composition, structure, ceramic materials, hydrometallurgical extraction of zinc, zinc powder, pigments, micronutrients.
Holding (Zhlobin, Belarus) is dust, which is caught by filters when the gasses emitted from steel-making arc furnaces are scrubbed. It is known from the published data that the return of gas-scrubbing dusts containing from 40% Zn and 50% Fe to the blast process stage without first removing the zinc results in undesirable increase of the zinc content in the iron and the formation of incrustations in the melting furnaces [1 – 4]. Scientific works where zinc is removed predominantly by pyrometallurgical methods from the wastes formed in steel-making are well-known. However, this technology has a number of drawbacks: high consumption of the reducing agent, production of low-quality commercial products, and additional contamination of the environment [1 – 4]. The objective of the present work was to perform a comprehensive investigation of the chemical and phase compositions, particle-size range, and other physicochemical properties of dust as well as processes occurring during the heat-treatment of the dust in order to determine the main directions for the recovery and reprocessing of dust formed during scrubbing of the outgoing gasses of the steel-making furnaces at BMZ OJSC – Management Company of BMK Holding. The enterprise provided for the studies samples of the dust formed as a result of scrubbing, in the dust-and-gas collecting units (DGCU), of the flue gases from three steel-making arc furnaces (Nos. 1, 2, 3). In what follows the studied samples of dust are designated as DGCU-1,2 and DGCU-3.
The reprocessing of production waste makes it possible not only to use native raw materials efficiently, thereby increasing production efficiency, but it also improves an enterprise’s and regional environmental situations. In steel-making the technogenic waste products are reaching 30% of the steel output steel, and include about 80% slags and approximately 20% dust and sludge from gas scrubbing. The total global growth of sludge is estimated to be (10 – 15) ´ 106 tons per year. It is known from the literature that in the steel-making process 1 – 2% of the raw materials entering the melting unit is converted into
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