Preparation method of sponge iron

Abstract

The invention discloses a preparation method of sponge iron. The preparation method comprises the following steps that step one, a raw material is prepared; step two, a reducing agent is prepared; andstep three, the technological process is carried out, specifically, (1), 42 columns of silicon carbide tank bodies are stacked on a vehicle surface; (2), a cylinder mould is placed at the center position of the silicon carbide tank bodies; (3), gaps between the cylinder mould and the silicon carbide tank bodies are filled with the reducing agent prepared in the step 2; (4), the cylinder mould isfilled with a prepared raw material, and a silicon carbide tank body opening is sealed; (5), a tunnel kiln is reduction is carried out; and (6), a product is subjected to drawing and cooling processing to form terminal product sponge iron powder. Compared with the prior art, the preparation method of the sponge iron has the advantages that the yield is increased, the cost is reduced, the product quality index is improved, and the product meets the high-end requirement of a reduced iron powder market; and the defects existing in a reduction technology are overcome.

Description

technical field [0001] The invention relates to the technical field of producing reduced iron powder by reducing iron oxide with solid carbon, in particular to a preparation method of sponge iron. Background technique [0002] The existing iron oxide powder and the prepared reducing agent are filled in the silicon carbide tank body in a ring-shaped interval through a mold, and are reduced in a tunnel kiln according to a certain time and temperature. [0003] Its disadvantages are: [0004] ①The reducing agent (the reducing agent is composed of coke powder, anthracite and calcium carbonate) is used in a large amount and the utilization rate is low, which leads to a substantial increase in the cost of the reducing agent; the amount of the reducing agent is 4-5 times the theoretical amount. [0005] ②Because the iron oxide powder and the reducing agent are filled separately, the carbon monoxide reducing gas produced by the gasification of carbon in the reducing agent must pass...

AI Technical Summary

Problems solved by technology

[0004] ①The reducing agent (the reducing agent is composed of coke powder, anthracite and calcium carbonate) is used in a large amount and the utilization rate is low, which leads to a substantial increase in the cost of the reducing agent; the amount of the reducing agent is 4-5 times the theoretical amount

[0005] ②Because the iron oxide powder and the reducing agent are filled separately, the carbon monoxide reducing gas produced by the gasification of carbon in the reducing agent must pass through the reducing agent layer before reaching the iron oxide powder layer for reduction reaction, and the diffusion path and resistance of the reducing gas increase , resulting in slow reduction of iron oxide powder, low reduction rate, and low product quality indicators

[0006] ③Affected by the above unfavorable factors, the filling thickness of the iron oxide powder layer in the silicon carbide tank is only 4--5cm, and the output is low

Iron oxide powder beyond this thickness range is difficult to restore thoroughly, resulting in a large number of defective products, high production risks for enterprises, and can only meet the low-end demand of the market

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