The invention relates to a
blast furnace injection material which is prepared in steps of preparing
candle coal or noncaking
coal into a lumpiness of 10-100 mm, carrying out
carbonization in a
carbonization furnace at 600-700 DEG C for 24 hours, classifying and
processing the
coal after the
carbonization, and selecting
powder of which the particle size is less than 5 mm as the
blast furnace injection material. The invention lowers the
blast furnace ironmaking
coke ratio and the
cast iron cost; can regulate the thermal
system of the furnace, improve the operating state of the blast furnace
hearth and ensure the stable and smooth operation of the blast furnace; and reduces the theoretical
combustion temperature and creates conditions for realizing high-wind temperature and
oxygen-enriched blast of the blast furnace. Compared with the gasification of
coke, the gasification of injection coal
powder discharges more
hydrogen, thereby enhancing the reducibility and the penetration diffusivity of the gas and being beneficial to the improvement on ore reduction and blast furnace operation indexes.
Metallurgical coke is replaced by the injection coal
powder partially, thereby moderating requirements for the
coke, decreasing coking facilities and saving the investment of capital construction. Besides, the invention decreases coke furnaces and produced coke and reduces the environmental
pollution caused by coking production, and simultaneously, and powder generated in the semicoke production can be fully utilized.