Method for reclaiming and reusing iron-making dust in blast furnace

Abstract

A method for recycling blast furnace ironmaking dust. The bag dust, gravity ash and other iron-containing dust recovered in the blast furnace smelting process are evenly mixed with coal powder, and sprayed into the hearth from the tuyere of the blast furnace. It is required that there is no accumulation in the hearth before injection. , no nodules in the furnace throat, and its process parameters: spray bag dust, the injection amount is 6-10Kg / t iron, hot air temperature> 1000 ℃, blast furnace zinc load <0.15Kg / t iron; spray gravity ash, injection amount is 6Kg / t iron ~ 15Kg / t iron, hot air temperature > 1050°C; spray other iron-containing dust, injection amount < 8Kg / t iron, dust particle size < 0.5mm, hot air temperature > 1050°C; the present invention has the functions of increasing iron, Saving coke, benefiting silicon reduction in molten iron, promoting smooth operation of blast furnace and strengthening smelting, benefiting safe coal injection, reducing nodulation in blast furnace, protecting the environment, and clean production, etc.

Description

technical field [0001] The invention belongs to the technical field of ironmaking and environmental protection, and in particular relates to a method for recycling dust in the ironmaking production process. Background technique [0002] During the blast furnace ironmaking process, ore (artificial rich ore or natural ore) and coke are alternately loaded into the furnace from the top of the furnace, and blast air is blown into the furnace from the lower part of the furnace (the tuyere of the hearth) to burn the coke. In order to reduce coke consumption, most blast furnaces inject pulverized coal into the furnace from the tuyeres. The iron ore in the blast furnace is heated and reduced during the descending process, and finally becomes molten iron, which is discharged from the iron hole at the lower part of the furnace regularly; coke and injected coal powder provide heat and reducing agent for the process. [0003] During the process of raw materials falling from the top of t...

AI Technical Summary

Problems solved by technology

[0006] At present, the ironmaking dust of most manufacturers in my country has not been fully utilized; some of them are used as sintering materials, and only Fe is recovered, and other beneficial components are rarely used, which is not conducive to reducing costs and polluting the environment.