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Method for producing direct reduced iron

A reduced iron, direct technology, applied in the metallurgical field, to achieve the effect of low price, reduced use, and good reduction effect

Active Publication Date: 2009-12-09
SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not use coke to make iron, but still needs to use coal (anthracite and bituminous coal) as a reducing agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Put the corn stalks into a drying oven, control the temperature at 200±20°C, and dry them for 10 hours. Then use a pulverizer to pulverize into small sections less than 2cm, and then grind the small sections into powders with a particle size of less than 2mm. Mix and roll fine iron ore powder, corn stalk powder, asphalt (bonding agent), calcium oxide (desulfurizing agent) and water together to form a spherical shape with a diameter of 30 mm. The composition ratio of the molded product is:

[0013] ①Concentrated iron ore powder (grade 65% or more)

[0014] ②Corn straw powder 120% of fine iron ore powder

[0015] ③Asphalt (binder) 2% of the weight of fine iron ore powder

[0016] ④ Calcium oxide 5% of the weight of fine iron ore powder

[0017] ⑤ appropriate amount of water

[0018] Put the spheroid molding into a drying box to dry, and then put it into a reduction furnace for reduction for 2 hours. The temperature of the reduction furnace is controlled at 900-1100 °...

Embodiment 2

[0023] Put walnut shells, apricot core shells, and peach core shells in a furnace and heat them for 10 hours without air at a controlled temperature of 900±20°C to make carbonized substances, then cool to room temperature and grind them into powder. Mix fine iron ore powder, carbide powder, bentonite (binder), calcium oxide and a small amount of water together, and press it into a cylinder with a length of 40 mm and a diameter of 25 mm. The composition ratio of the cylindrical molding is:

[0024] ①Concentrated iron ore powder (grade 64% or more)

[0025] ②Carbide powder 80% of the weight of fine iron ore powder

[0026] ③2% of the weight of bentonite fine iron ore powder

[0027] ④Calcium oxide 4% of the weight of fine iron ore powder

[0028] ⑤ appropriate amount of water

[0029] Put the cylindrical molding into a drying oven to dry, and then put it into a reduction furnace for heating and reduction for 2 hours. The temperature of the reduction furnace is controlled at ...

Embodiment 3

[0034] (1) Put the sawdust in the furnace, heat for 10 hours in the absence of air, control the temperature at 900±20°C, make carbonized substance, then cool to room temperature, and grind into carbonized substance powder.

[0035] (2) Mix the fine iron ore powder and the carbide powder in a ratio of 1:1, add 5% calcium oxide by weight of the fine iron ore powder, 2% bentonite and an appropriate amount of water, and roll to form a 25mm mass.

[0036] (3) Grinding limestone (calcium carbonate) into powder, using water glass as a binding agent, wrapping the outside of the spheroid described in (2) to make a coated pellet.

[0037] (4) Dry the coated pellets described in (3) in an oven, then put them into an electric arc furnace for heating and reduction for 3 hours, and control the temperature of the electric arc furnace at 1500-1600°C.

[0038] (5) Take out the coated pellets from the electric arc furnace, cool to normal temperature, and crush the shell to obtain reduced iron. ...

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Abstract

The invention relates to a method for producing direct reduced iron. Refined iron ore powder is taken as raw material, the material and reducing agent are mixed in proportion of 1:0.5-5.0, binding material is added to prepare a preform, and the preform is placed in a reducing furnace to produce direct reduced iron at 700-1600 DEG C by reduction. The reducing agent is straw and fruit of crops, or dry fruit shell, or branch, leaf and wooden meal of trees, or the mixture thereof. The straw and fruit of crops, or dry fruit shell, or branch, leaf and wooden meal of trees, or the mixture thereof is dried and dehydrated at 50-300 DEG C to be made into powder, or is treated by insulating from air at 400-1200 DEG C to be made into powder. The characteristic of the powder after high temperature treatment is close to that of activated carbon, and the powder, being used as the reducing agent of reduced iron, has high activity, fast reducing speed, good reducing effect and good product quality; by applying the invention, use of non-renewable energy resource can be reduced, thus being beneficial to environmental protection, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and specifically relates to a method for producing direct reduced iron by using crop stalks, fruits, dried fruit shells, tree branches, leaves, sawdust, or their mixtures as reducing agents. Background technique [0002] Smelting reduction ironmaking is an important part of current steel production. Its main feature is to use non-coking coal as a primary energy source and reducing agent to reduce iron oxide in a molten state. It has the advantages of using coal instead of coke, short process, and less environmental pollution. , low construction investment, low production cost and other advantages, it is widely optimistic about the field in the industry, and iron and steel enterprises in various countries are competing to carry out research and development. The existing smelting reduction ironmaking methods mainly include COREX method (CN1010323B), DIOS method (CN1035136A), and HISELT method (C...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 贾会平
Owner SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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