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Briquetting of Porous Alumina-Containing Materials Using Organic Binders

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Abstract

The wastes of corundum production in the form of porous alumina sludge is a promising material to provide ferrous metallurgy with cheap alumina-containing slag-formers. However, the direct feeding of the pulverized materials to the steelmaking furnace leads, as a rule, to a significant carryover of such materials together with waste gases. In this paper, the potential for making briquettes based on porous corundum production sludge by cold briquetting using various common binders (molasses, cement, polyacrylamide-based powder, polyvinyl acetate-based emulsion) is discussed. The features of cold briquetting have been compared for the case of powdered porous materials (the sludge originating from the production of electrocorundum) and for the case of dispersed crystalline materials (chromium ore fines). Experiments have been carried out in order to determine the impact strength of briquettes based on different binders (so-called cold strength) and to determine so-called hot strength (via thermal shock testing). The binder consumption required for obtaining satisfactory characteristics of briquettes made of corundum sludge and made of chromium ore fines has been determined. A technique has been developed and a mechanism for the binding of loose and crystalline particles has been determined during briquetting with the use of polyacrylamide powder. It is shown that the destruction of the briquettes made of loose materials occurs mainly along the grains of the most porous material, whereas the briquettes made of crystalline materials are destroyed along the grain boundaries glued with a binder. Upon briquetting, in the case of porous materials, the binder consumption is twice greater as compared to the binder consumption in the case of fine crystalline fraction with the use of the same binder. Thus, the binder should necessarily impregnate the entire volume of a porous material.

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Authors and Affiliations

  1. National University of Science and Technology (MISiS), 119049, Moscow, Russia

    V. V. Aksenova, S. A. Alimbaev, A. V. Pavlov & R. M. Mustafin

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  1. V. V. Aksenova
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  2. S. A. Alimbaev
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  3. A. V. Pavlov
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  4. R. M. Mustafin
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Correspondence to V. V. Aksenova, S. A. Alimbaev, A. V. Pavlov or R. M. Mustafin.

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Translated by O. Polyakov

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Aksenova, V.V., Alimbaev, S.A., Pavlov, A.V. et al. Briquetting of Porous Alumina-Containing Materials Using Organic Binders. Steel Transl. 51, 291–295 (2021). https://doi.org/10.3103/S0967091221050028

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  • DOI: https://doi.org/10.3103/S0967091221050028

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