With an insufficient and incomplete amount of coals supplied for coking it is possible to produce blast-furnace coke from a coal blend of the following composition: G, 20 percent; Zh, 50 percent; and KO, 30 percent with the expected indices of mechanical strength being as follows: M_(25) = 83.2 percent and M_(10) = 7.7 percent.Addition to this coal blend of <=4 percent of middlings (from coal beneficiation) practically does not change the strength indices of the coke produced. With the content of middlings ranging from 4 to 10 percent the index M_(25) of the coke produced undergoes little change, as before, and the index M_(10) diminishes, on an average, by a factor of 0.1 percent per each percent of the added material. Addition of middlings leads to an increase of the ash content of coke by a factor of 0.4 percent per each 1 percent of the added material.Upon addition of coke breeze in an amount of <=3 percent the index M_(25) decreases by a factor of 2.5 percent on an average and the index M_(10) increases by 1.8 percent on an average per each percent of the added material.Upon addition of coal tar in an amount of <=3 percent to the coal blend the index M_(25) decreases, on an average, by a factor of 0.8 percent and the index M_(10) increases by 0.3 percent on an average. Upon joint addition of coke breeze and coal tar in the ratio of 1:1 in an amount of <=3 percent of each of the materials the index M_(25) decreases by a factor of 1.7 percent on an average and the index M_(10) decreases by a factor of 1.2 percent per each 1 percent of the coke breeze and tar added.
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