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.

中文翻译：

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使用有机粘合剂压块多孔含氧化铝材料

摘要

以多孔氧化铝污泥形式存在的刚玉生产废料是一种有前途的材料，可为黑色冶金提供廉价的含氧化铝造渣剂。然而，将粉碎的材料直接送入炼钢炉通常会导致这些材料与废气一起大量携带。在本文中，讨论了使用各种常见粘合剂（糖蜜、水泥、聚丙烯酰胺基粉末、聚醋酸乙烯酯基乳液）通过冷压块基于多孔刚玉生产污泥制备煤球的潜力。对于粉末状多孔材料（源自电刚玉生产的污泥）和分散结晶材料（铬矿粉）的情况，比较了冷压块的特征。已经进行了实验以确定基于不同粘合剂的煤球的冲击强度（所谓的冷强度）和确定所谓的热强度（通过热冲击测试）。已经确定了获得由刚玉污泥和铬矿粉制成的煤球的令人满意的特性所需的粘合剂消耗量。已经开发了一种技术，并确定了在使用聚丙烯酰胺粉末压块过程中结合松散和结晶颗粒的机制。结果表明，由松散材料制成的煤球的破坏主要发生在多孔材料的晶粒上，而由结晶材料制成的煤球则沿着用粘合剂粘合的晶界进行破坏。在压块时，在多孔材料的情况下，与使用相同粘合剂的细晶部分情况下的粘合剂消耗量相比，粘合剂消耗量高两倍。因此，粘合剂必须浸渍多孔材料的整个体积。