Efficiency of the Functional Distribution of Solid Fuel in Layered System Consisting of Ore-Flux-Fuel Compositions

Дмитро Федорович Чернега, Валерій Миколайович Нещадим, Петро Денисович Кудь, Дмитро Вікторович Іванченко

Abstract


In this article processes of pelletizing and sintering iron ore pellets with different distribution of solid fuel in multilayer system were experimentally investigated. The influence of the functional distribution of solid fuels on the compressive strength and the degree of metallization fired pellets was studied. Compressive strength of burnt pellets with basicity of 1.4, which contain increased amounts of particulate fuel in range of 1,6–2,35 kN/pellet and not characterized by high indices, although GOST has indices on level 0,2–0,95 kN /pellet. Reallocation of a solid fuel is characterized by concentration of fuel in granules themselves (12 %) and only 3,3 % in space between the pellets. As a result, this significantly increases the degree of metallization of the calcined material, reducing the thermal load on the electric unit of the reaction site of electric furnace and slightly reduces compressive strength of burnt pellets. Maximum increase in the degree of metallization (38,2 %) of burnt pellets is observed in the presence of the protective layer of a quick lime and iron ore mixture on the surface. The protective shell serves as an additional barrier which, during passing the firing and cooling the pellets, prevents the free access of oxygen to the carbon particles located within the granules, substantially reducing the intensity of the oxidation reaction of the solid fuel. As result this increases the degree of metallization of the charge material and decreases outflow of melt from the pellets burning in this moment, and it does not lead to fusing them into large lumps. Increasing degree of metallization of burnt pellets is accompanied by an increase in the concentration of metallic iron in the form of “globular particles” in the nucleus, and granules of iron monoxide in the surface layer.

Keywords


Pellet; Metallization of charge; Agglomeration; Blast-furnace process

References


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DOI: https://doi.org/10.20535/1810-0546.2014.2.52376

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