The urgent problem regarding the depletion of mineral resources in ferrous metallurgy can be efficiently solved by a complex reuse of man-caused waste products. Such wastes are mostly presented by electric arc furnace (EAF) slag and ladle furnace (LF) slag. These two kinds of slag are not completely utilized. The residues of these slags are stored in dumps of enterprises and thereby pollute the environment. However, the residues of EAF and LF slags can be converted into valuable industrial products by interaction between the slag components. This paper presents the studies concerning joint wasteless processing of EAF and LF slags with the obtaining of Portland cement clinker and pig iron. Description of the disadvantages of industrial methods for processing these slags is considered, and the relevance of ladle slag processing is shown. The mathematical simulation results of slag fluidity, depending on the composition, are presented, which are based on real investigations, as well as its described experimental technique. The chemical composition of the charge mixtures making it possible to process these slags with limestone roasting wastes into complete extent with no residue has been determined. Such processing provides the quality of produced cast iron and Portland cement clinker to meet the requirements of normative documents. Results for measuring the viscosity of different slag compositions, a description of the obtained slag phases, as well as its final temperature mode, are presented. The results of experimental-industrial tests performed for the developed processing technology are considered, and complete flow chart involving the use of tilt rotary furnaces is presented.
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The work has been performed according to the State assignment for the Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences.
Translated by O. Polyakov
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Sheshukov, O.Y., Egiazar’yan, D.K. & Lobanov, D.A. Wasteless Joint Processing of Ladle Furnace and Electric Arc Furnace Slags. Steel Transl. 51, 156–162 (2021). https://doi.org/10.3103/S0967091221030116
- ladle furnace slag
- electric arc furnace slag
- Portland cement clinker
- cast iron
- chemical composition
- phase composition
- man-caused formations