Method for treating iron-containing dust of iron and steel plant by using cupola furnace

Abstract

The invention discloses a method for treating iron-containing dust in an iron and steel plant by using a cupola furnace, belonging to the technical field of iron making. The method is characterized by comprising the following steps of: blending, uniformly mixing, briquetting and maintaining raw materials including dust in the iron and steel plant, a carbonaceous reducing agent, a bonder and an additive, and then putting the raw materials into the cupola furnace for iron making, wherein the carbon content of carbon-containing pellets prepared by briquetting raw materials of various iron-containing dust in the iron and steel plant is about 10%, the compressive strength of the maintained pellets is greater than 1000N per each pellet, and the pellets are distributed into the cupola furnace for iron making through a material distribution system; and preheating blast through a hot blast furnace, preheating the wind temperature from a normal temperature to about 500-1200 DEG C, and enriching oxygen by 1-5% in the blast to achieve the aims of improving the smelting strength, increasing the output and reducing the coke ratio. By adopting the method, the dust of the iron and steel plant can be recycled to achieve the aims of saving energy, reducing emission and reducing environmental pollution, so that the method has good economic and social benefits.

Description

[0001] technical field [0002] The invention relates to a method for treating iron-containing dust in a steel plant with a cupola furnace. In particular, it can handle dust with high K, Na and Zn elements. The specific method is to make carbon-containing pellets from various iron-containing dusts and carbonaceous reducing agents in iron and steel plants, and perform reduction, melting and separation of slag and iron in a cupola to obtain liquid iron and enrich dust such as zinc, potassium and sodium. This process can not only recover the iron element in the dust, but also enrich the harmful element, turn the cost into wealth, and reduce the pollution to the environment at the same time. Background technique [0003] 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 sintering, pelletizing, blast furnace, conver...

AI Technical Summary

Problems solved by technology

The method is mainly composed of two parts: the process of preparing carbon-containing pellets from dust and the process of smelting carbon-containing pellets from dust with high oxygen-enrichment and high wind temperature in a cupola furnace. High consumption, low yield and difficult enrichment of harmful elements, etc., the specific process method is as follows:

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