Iron coke for blast furnace and preparing method thereof

Abstract

The invention relates to iron coke for a blast furnace and a preparing method thereof. The iron coke comprises 5wt%-20wt% of iron ore powder and 80wt%-95wt% of mixed coal; the mixed coal is formed by mixing 25wt%-29wt% of one third of coking coal, 40wt%-44wt% of coking coal, 7wt%-11wt% of lean coal, 6wt%-10wt% of gas-fat coal and 12wt%-16wt% of fat coal; the iron ore powder and the mixed coal are mixed uniformly with water and tamped before entering the blast furnace, and are placed into the blast furnace when the temperature is 800 DEG C, the temperature is increased at the speed of 2 DEG C per minute to 3 DEG C per minute, the iron ore powder and the mixed coal are discharged from the blast furnace when the temperature is 950-1050 DEG C, and the iron coke is obtained by adopting a wet way of quenching the coke. According to the iron coke and the preparing method, the performance, the ratio, the particle size and the composition and the like of the iron ore powder and the mixed coal are optimized, and the strength and the reactivity of the iron coke can meet the requirement of the blast furnace process under the circumstance of not adding binding agents.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to an iron coke for a blast furnace and a preparation method thereof. Background technique [0002] The idea of ​​adding iron-containing materials to coal to make iron-containing coke was first proposed by H.Wending in 1865. At that time, the purpose of making iron coke was mainly to sinter iron-containing materials during coking, so as to save the process of lump ore or sintering and add iron-containing materials to the blast furnace, mainly using coal with good coking properties such as fat coal, etc. Iron coke. The former Soviet Union has made great contributions to the use of iron-containing blast furnace ash to smelt iron coke. In 1955, North Korea was at 73m 3 Experiments were carried out on iron coke smelted with 5% ore powder in a small blast furnace. Limited by the level of coking technology at that time, the mechanical strength of iron coke was poor...

AI Technical Summary

Problems solved by technology

[0012] The above-mentioned iron coke production method mainly has the following problems: 1) It is necessary to cold-press the mixture of raw coal and iron ore to form a block and dry distillation to produce iron coke. The working conditions are poor and the output is low, which is difficult to meet the needs of large-scale blast furnaces; 2. ) Dry distillation with a vertical distillation furnace is not suitable for domestic ordinary coke oven production; 3) Some methods require the use of binders to increase the strength of iron coke, but the use of binders will increase the cost of coking, and at the same time, the operating conditions are harsh and pollute surroundings