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

Abstract

Disclosed is a process for reclaiming and using blast furnace iron-smelting bug dust. The hop-pocket dust, gravitational force gray and other iron containing bug dust which are reclaimed during the blast furnace smelting process are mixed homogeneously with coal fines, and then are sprayed into a furnace hearth through the tuyeres of blast furnace, wherein it is required that there is no accumulation at the furnace hearth and no tumour junction at the furnace throat before the blowing. The processing parameters are as follows: when hop-pocket dust is sprayed, the spraying-in amount is 6-10 kg / t iron, the hot blast temperature is higher than 1000 DEG C, the blast furnace zincium load is lower than 0.15 kg / t iron; when gravitational force gray is sprayed, the spraying-in amount is 6-15 kg / t iron, the hot blast temperature is higher than 1050 DEG C; when other iron containing bug dust is sprayed, the spraying-in amount is lower than 8 kg / t iron, the bug dust particle diameter is smaller than 0.5 mm, the hot blast temperature is higher than 1050 DEG C. The present invention has the advantages such as iron increasing, energy saving, molten iron silicon reduction favoring, blast furnace smooth running and intensification smelting promoting, coal spraying safety favoring, blast furnace tumour junction alleviating, environment protecting, clean production, and the like.

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

[0007] 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.