Size and mechanical strength of blast-furnace coke
The lump size and mechanical strength of coke are influenced by every variable in the entire production cycle, including the composition and properties of the coke-oven blend, charge preparation and carbonization conditions, etc.; they also determine the blast-furnace performance levels and are general, and therefore vital, indices of coke quality. Iron ore materials are becoming smaller in size but stronger and more abrasive, while the proportion of coke in blast-furnace burdens is decreasing. These and other factors justify the demand for a smaller coke of greater size uniformity and higher mechanical strength, particularly abrasion resistance. The basic quality criterion for blast-furnace coke is its 60-40 mm size fraction content; the combination of properties in this size fraction correspond most closely to blast-furnace requirements. There are insufficient grounds for rejecting the 80-60 mm size fraction of coke as a blast-furnace fuel, since its quality has already improved and it is possible to grade the saleable 80-25(20) mm product into narrower size fractions for use in separate blast furnaces. The use of 60-25 mm coke for iron smelting may be justified, provided it is shown that its isolation and separate consumption is cost-effective. Coke supplies can be increased by subjecting the >80 mm size fraction to mechanical conditioning, again subject to its cost-effectiveness being demonstrated. Low-sulfur coke in this size fraction should be reserved for foundry use.
- OSTI ID:
- 6839068
- Journal Information:
- Coke Chem., USSR (Engl. Transl.); (United States), Vol. 1; Other Information: Translated from Koks Khim.; No. 1, 16-20(1977)
- Country of Publication:
- United States
- Language:
- English
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