Blast furnace injection material

Abstract

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.

Description

technical field [0001] The invention relates to a reducing agent for providing heat in the iron and steel industry production process, in particular to a blast furnace injection carbon which can replace coke. Background technique [0002] Coke is mostly used in modern blast furnace smelting, which provides heat and reducing agent during the smelting process. Therefore, coke is a necessity in the process of blast furnace ironmaking. However, the production conditions of coke are more complicated. Under certain conditions, it is heated to 950-1050°C, and then it is finally made into coke through drying, pyrolysis, melting, bonding, solidification, shrinkage and other stages. In this way, the use of coke not only increases the production cost of steel, but also exacerbates the contradiction of resource shortage , and the production process of coke will produce harmful substances that pollute the environment. Therefore, it is imperative to seek a reducing agent that can replace ...

AI Technical Summary

Problems solved by technology

[0002] Coke is mostly used in modern blast furnace smelting, which provides heat and reducing agent during the smelting process. Therefore, coke is a necessity in the process of blast furnace ironmaking. However, the production conditions of coke are more complicated. Under certain conditions, it is heated to 950-1050°C, and then it is finally made into coke through drying, pyrolysis, melting