A method for preparing and charging blast furnace charge

Abstract

The invention discloses a material preparation and material charging method of blast furnace feeding materials. The method mainly comprises the steps of material preparation and material mixing. Firstly, pellet, coke nut, lump ore and sintered ore are prepared; then pellet, coke nut, lump ore and one part of sintered ore are mixed to obtain a mixed material; the mixed material is uniformly laid ona conveying belt; then, the other part of sintered ore is laid on a conveying belt positioned behind the mixed material; secondly, raw materials on the conveying belt are sequentially fed into an upper tank in a natural material falling mode and is then fed into a lower tank in the natural material falling mode, so that the mixed material is positioned at the lower part of the lower tank, and thesintered ore is positioned at the upper part of the lower tank. Before the raw materials enter a blast furnace, the pre-mixing process is completed in a mode of twice natural material falling; by using the process, all raw materials can be sufficiently and uniformly mixed; the lump ore concentrated distribution phenomenon can be avoided; therefore more lump ore can be added relative to the conventional proportion on the premise of ensuring the material layer ventilation performance and avoiding the coal gas flow abnormality; the raw material cost can be reduced.

Description

technical field [0001] The invention relates to the field of blast furnace ironmaking, in particular to a method for preparing and charging blast furnace charge. Background technique [0002] Blast furnace raw fuel mainly includes: coke, sinter, pellets, lump ore, and coke; among them, sinter is an alkaline raw material, pellets and lump ore are acidic raw materials, and coke and coke are fuel. [0003] As far as the existing technology is concerned, the mass ratio of the sum of pellets and lump ore in traditional blast furnace ingredients to sinter is about 3:7, and when charging, sinter, pellets, lump ore and coke The proportions and positions of are relatively random, and there are no definite standards and requirements. However, in actual production, due to the differences in the performance of each raw material and the unstable position, it is easy to cause the accumulation of lump ore, which makes the gas permeability of the material layer poor and causes the gas flow...

AI Technical Summary

Problems solved by technology

[0003] As far as the existing technology is concerned, the mass ratio of the sum of pellets and lump ore in traditional blast furnace ingredients to sinter is about 3:7, and when charging, sinter, pellets, lump ore and coke The proportion and position of the system are relatively random, and there are no definite standards and requirements

However, in actual production, due to the differences in the performance of each raw material and the unstable position, it is easy to cause the accumulation of lump ore, which makes the gas permeability of the material layer poor and causes the gas flow in the furnace to be abnormal; therefore, in the traditional proportioning, as much as possible Reduce the proportion of lump ore to avoid the phenomenon of low-temperature reduction of furnace charge caused by the concentrated distribution of lump ore. The traditional proportion is 10%-15%, so it is necessary to increase the proportion of other raw materials to meet the requirement of constant total quality, while other The price of ingredients is higher than that of lump ore, which ultimately leads to an increase in the production cost of the blast furnace

Images