Influence of coke breeze particle size on quality of sinter

Abstract

Iron ore sintering is an extremely complex process involving fuel combustion to generate heat and reducing gases like CO. This heat allows physicochemical, solid and solid-liquid reactions to form liquids of complex components as fuel particles are consumed and cooling processes allow the formation of solid mineral phases. At JSW coke breeze from coke ovens is used as solid fuel in sinter. The properties (size) of the solid fuel play a very important role in determining the sinter microstructural properties and sinter quality. The microstructure of the sinter is a basic necessity and also the first step towards establishing the structural property relationship. Microstructural studies have been carried out to understand the effect of coke breeze particle size on sinter microstructure and sinter properties. The present paper is an attempt to understand and correlate the physical and metallurgical properties of sinter with varying size of the coke breeze particle in sinter mix. It was observed that as the proportion of coke breeze below 3 mm in the sinter mix increased from 53?0 to 90?0% the calcium ferrite phase increased, the number of bigger size pores decreased, and thereby decreased the reduction degradation index (23?15 mm) of sinter from 39?7 to 23?5%. Superior sinter properties were obtained with the 23 mm coke breeze size ,90% in the sinter mix.

Biomass as a Source of Energy in Iron Ore Agglomerate Production Process

“…So far, studies have indicated a potential for emissions reduction and productivity increase using biomass in agglomeration of iron ore [3][4][5][6][7][8][9][10][11][12][13][14]. However, a more thorough analysis is necessary with respect to the impact of biomass on the properties of the final product, blast furnace agglomerate, which must meet strict quality requirements in terms of the blast furnace process.…”

Estudo da influência da sinterização de minérios de ferro na redução por hidrogênio.

“…O combustível mais utilizado nas plantas de sinterização é a moinha de coque (finos de coque) (13,1,16) .…”

“…Os combustíveis para sinterização devem possuir granulometria entre 1,0 e 3,0mm, poder calorífico e reatividade suficientes para fornecer energia durante o processo (1,13) .…”

“…O tamanho das partículas do combustível influencia na porosidade, nas fases formadas e na redutibilidade e resistência do sínter (3,4,13) .…”

“…Os principais fundentes utilizados na sinterização são o calcário, cal, dolomita, serpentinito, quartzito, e olivina (3,4,13) .…”