Method for treating iron-containing dust of iron and steel plant

Abstract

The invention discloses a method for treating iron-containing dust of an iron and steel plant, and belongs to the field of metallurgical environmental protection. The method comprises the following steps of uniformly mixing the iron-containing dust of the iron and steel plant and a binder according to a ratio by using a mixer, and briquetting a mixture to prepare carbon pellets; uniformly adding the prepared carbon pellets into a blast furnace iron storage type main channel front section iron falling point area in the direction opposite to the iron flow direction during blast furnace iron tapping through a material distribution device arranged at the upper end of a blast furnace iron storage type main channel; and conducting smelting reduction on the carbon pellets added to the front section iron falling point area through high-temperature slag iron in the blast furnace iron storage type main channel, enabling reduced metal iron to directly enter molten iron for steelmaking, and enabling residues generated after the reaction to become water granulated slag. According to the method, recycling of iron-containing solid waste is achieved, clean production is achieved, energy conservation and emission reduction are effectively achieved, the enterprise concepts of high efficiency, low consumption and low emission are practiced, construction of a harmonious green novel steel enterprise is further advanced, and considerable economic benefits can be generated.

Description

technical field [0001] The invention relates to the technical field of metallurgy and environmental protection, in particular to a method for treating iron-containing dust in iron and steel plants. Background technique [0002] With the rapid development of the iron and steel industry, the amount of iron-containing dust produced by iron and steel plants is increasing year by year. There are many types of iron-containing dust, mainly from systems such as blast furnaces, converters, and electric furnaces. These dusts are generally fine in particle size and contain a large amount of iron and carbon elements, which is a resource worth recycling. However, due to the high content of harmful elements such as Zn, K and Na in the dust of iron and steel plants, if it is directly used for agglomeration and returned to the blast furnace, it will cause the enrichment of harmful elements in the blast furnace, which will seriously affect the production and life of the blast furnace . [...

AI Technical Summary

Problems solved by technology

At present, the relatively mature process of fire treatment is to use rotary hearth furnace and rotary kiln to treat dust, and the obtained products are metallized furnace charge and dust enriched with harmful elements; but the direct reduction process has large investment, low efficiency, high cost and gain. The sponge iron needs to be melted again and other disadvantages

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