Reduction furnace with inner heating containers for producing direct induction iron

A technology of reducing iron and reducing furnace, which is applied in the field of heating liner reducing furnace for direct reduction iron production, can solve the problems of backward equipment level, high product cost, poor sales, etc., and achieves prevention of excessive heating temperature and excellent environmental protection performance. , the effect of reducing production costs

Inactive Publication Date: 2013-02-06

邹建明

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AI-Extracted Technical Summary

Problems solved by technology

[0005] The downdraft kiln developed earlier in my country, and its characteristics are: less investment, quick start-up, low cost, flexible scale, simple operation, low requirements for raw materials, but its product quality is poor and unstable, low production efficiency, high energy consumption, High labor intensity, poor operating environment, serious environmental pollution, backward equipment level, fully manual operation, no mechanization at all, but because of the low investment and some small enterprises are using it, the country does not advocate the use

[0006] Process characteristics of rotary kiln: high degree of mechanization, high operating environment, light pollution, but there are also high product costs, large investment, prone to loop failure, low product quality, and low filling factor (generally 10%- 20%), high product differentiation rate

Strict requirements on raw materials and reducing agents, low productio...

Method used

[0019] Embodiments of the present invention. The reduction furnace with a heating liner for the production of direct reduced iron is shown in Figures 1 and 2. Its structure includes a furnace body. 3 is connected with a conductive device 7, a feed inlet 5 is installed on the top of the furnace body, and a discharge outlet 1 is installed on the bottom of the furnace body. As s...

Abstract

The invention discloses a reduction furnace with inner heating containers for producing direct induction iron. The reduction furnace structurally comprises a furnace body, and is characterized in that a fire-resistant insulating heat-insulation layer (6) is arranged on the outer wall of the furnace body, the inner heating containers (3) are arranged in the fire-resistant insulating heat-insulation layer (6) and connected with conductive devices (7), a feed inlet (5) is arranged on the top of the furnace body, and a discharge outlet (1) is arranged at the bottom of the furnace body. After being mixed with balance carbon (used as a reducing agent), solid optional-grade iron ores in optional shapes can be directly reduced into sponge iron by the reduction furnace. The reduction furnace has the advantages that limitation on the grades of the iron ores and the quality and the varieties of coal are cast off, materials used by the reduction furnace are abundant, the reduction furnace is simple in structure, reliable in technique and excellent in environmental performance, the production cost is greatly lowered, and particularly, an additional value is increased in a production process.

Application Domain

Electric furnace

Technology Topic

CoalInsulation layer +4

Image

Examples

Experimental program(1)

Example Embodiment

[0019] Embodiment of the present invention. Heating liner reduction furnace for direct reduced iron production, such as figure 1 with 2 As shown, the structure includes a furnace body, the outer wall of the furnace body is a refractory insulation layer 6, a heating liner 3 is installed in the refractory insulation layer 6, the heating liner 3 is connected with a conductive device 7, and the top of the furnace body is equipped with a feed inlet 5. Discharge port 1 is installed at the bottom of the furnace body. Such as figure 2 As shown, the heating inner bladder 3 may have a circular ring structure, which is convenient for production and installation. In order to improve heating efficiency and capacity, more than one heating liner 3 in the furnace body can be used, and heating channels are used between the heating liners 3 and between the heating liner 3 and the inner wall of the furnace.

[0020] The heating liner 3 can be made of an existing electric heating element such as silicon carbide, graphite or metal heating liner.

[0021] The flue gas pipe 4 is connected to the furnace body, and the connection position of the flue gas pipe 4 can be the top, side wall or bottom of the furnace body.

[0022] The furnace body is divided into preheating section, heating section and reduction reaction section from top to bottom.

[0023] The working process is as follows:

[0024] a. After mixing the desulfurizing agent, dephosphorizing agent, and reducing agent, they are dried until the water content of the material is less than 3%. The dried material is crushed, and the crushing particle size of the material is below 1.5mm to obtain the reducing additive.

[0025] b. The iron ore is crushed and dried, and the water content of the material is less than 3%;

[0026] c. Feed the reducing additives and iron ore powder into the furnace body of the electric heating reduction furnace from the inlet 5, and the materials enter the heating channel between the heating inner tank 3, and are heated by the heating inner tank 3, and the material is preheated in the preheating section. To 300℃-500℃, enter the heating section to heat up to 950℃, and then heat to 950℃-1100℃ in the reduction reaction section to carry out the reduction reaction. The iron oxide in the ore is reduced to obtain elemental iron, and then it falls into the cooling of the outlet 1 Section, wait for the material to cool down and then come out

[0027] d. After further cooling, the discharged materials are crushed, and the reduced iron is selected through magnetic separation, and then compressed and formed by a briquetting machine to obtain direct reduced iron.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple structure
Rich material

Reduction furnace with inner heating containers for producing direct induction iron

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

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Description & Claims & Application Information

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