Abstract
By laboratory coking and experimental industrial coking, it is found that increasing the content of gas coal in the coking batch from 25 to 35% decreases the yield of blast-furnace coke and also its mechanical strength (M25, M10) and its hot strength CSR. Along with decrease in coke strength, its content of the >80 mm class declines and the contamination with the <25 mm class increases. In addition, the yield of all the basic coking byproducts (tar, raw benzene, ammonia, hydrogen sulfide, coke-oven gas) increases. After the coking of batch with increased gas-coal content, no disruption of the refractory lining or graphitization is noted. When blast-furnace coke produced from batch with elevated gas-coal content is used, the mean consumption of skip coke, blast-furnace coke, and coke nuts is increased. The oxygen concentration in the blast and the natural-gas consumption are slightly decreased. Economic calculations show that the decrease in cost of 1 t of hot metal associated with decrease in cost of the coking batch is $8.40.
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