Blast-Furnace Use of Coke Dust Formed in Dry Quenching

摘要

The physicochemical and thermal properties of coke dust formed in the dry-quenching process are studied, with a view to its use in pulverized-coal fuel for blast furnaces. The use of such dry-quenching dust in pulverized fuel is complicated by three main factors: its elevated ignition temperature; low chemical activity; and highly abrasive properties. Differential scanning calorimetry is used to study the heating associated with the reaction between dry-quenching dust and oxygen, in the presence of ignition intensifiers such as coal with a high yield of volatiles (G coal) and lignite semicoke, as well as coal with a low yield of volatiles (T coal). The presence of lignite semicoke, whose chemical activity is 20 times that of coke dust, permits the effective use of pulverized fuel consisting of T coal, lignite semicoke, and dry-quenching dust, which has a low yield of volatiles. This is a smokeless fuel, with corresponding reduction in the environmental impact of the blast-furnace production of iron. Information is provided regarding the coal reserves in the Kuznets Basin, the lignite reserves in the Kansko-Achinsk Basin, and the production technology for lignite semicoke.