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A method for preventing coking and sticking of cold-pressed iron

A technology of iron coke and cold pressing, which is applied in the field of iron and steel metallurgy, can solve the problems of cumbersome preparation and use of inhibitors, inapplicability of cold pressing iron coke, and increased production costs, so as to prevent carbonization and sticking, low price, and high efficiency. The effect of production efficiency

Active Publication Date: 2020-11-24
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, due to the large difference in composition and bonding mechanism between pellets and cold-pressed iron coke, it is not suitable for cold-pressed iron coke; and in the method of inhibiting pellet bonding in the shaft furnace, the preparation and use of the inhibitor It is more cumbersome, and the prepared green balls need to be dried, which makes the process complicated and the production cost increases

Method used

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  • A method for preventing coking and sticking of cold-pressed iron
  • A method for preventing coking and sticking of cold-pressed iron

Examples

Experimental program
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Effect test

preparation example Construction

[0029] Step S1, preparation of the first iron coke green pellets: according to 10%-40% iron ore powder, 55%-80% bituminous coal and 5%-10% anthracite, uniformly mix iron ore powder, bituminous coal and anthracite, and heat to 60-150 °C to obtain the first mixture; spray 5% to 7% steam-heated asphalt binder into the first mixture and mix evenly to obtain the second mixture; at a pressure of 3t / cm to 6t / cm The second mixture is subjected to counter-roll cold pressing to obtain the first iron coke green pellets.

[0030] Bituminous coal and anthracite are non-coking coals. Using them as raw materials for making iron coke is not only cheap, but also greatly improves the source of raw materials and the comprehensive utilization of waste. Heating the uniformly mixed iron ore powder and coal powder ensures that the bitumen still has good fluidity when added to the first mixture, so as to promote the uniform mixing of the bitumen and the first mixture.

[0031] Step S2, preparation o...

Embodiment 1

[0053] Step S1, the preparation of the first iron coke green pellets is the same as that of Comparative Example 1.

[0054] Step S2, preparation of the second iron coke green ball: according to the spraying amount of the cement dispersion liquid being 5% of the mass of the first iron coke green ball, 13.5% of the commercially available cement dispersion liquid is sprayed on the first iron coke green ball by using compressed air with a pressure of 0.6-1.0 MPa. The surface of the iron burnt ball is obtained to obtain the second iron burnt ball.

[0055] Step S3, preparation of iron coke products: put the second iron coke green pellets into the shaft furnace, 2 Dry distillation is carried out under the mixed atmosphere of CO and CO to control CO 2 The partial pressure of the gas is below 10%, CO 2 The total gas flow rate of mixed gas with CO is 5L / min; the second iron coke green pellets are heated from room temperature to 550°C at a heating rate of 3°C / min in the shaft furnace,...

Embodiment 2

[0058] Step S1, the preparation of the first iron coke green pellets is the same as that of Comparative Example 1.

[0059] Step S2, preparation of the second iron coke green balls: according to the spraying amount of the cement dispersion liquid being 5% of the mass of the first iron coke green balls, 18% of the commercially available cement dispersion liquid is sprayed on the first iron coke green balls by using compressed air with a pressure of 0.6-1.0 MPa. The surface of the iron burnt ball is obtained to obtain the second iron burnt ball.

[0060] Step S3, preparation of iron coke products: put the second iron coke green pellets into the shaft furnace, 2 Dry distillation is carried out under the mixed atmosphere of CO and CO to control CO 2 The partial pressure of the gas is below 10%, CO 2 The total gas flow rate of mixed gas with CO is 5L / min; the second iron coke green pellets are heated from room temperature to 550°C at a heating rate of 3°C / min in the shaft furnace...

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Abstract

A method for preventing cold-pressed iron coke from coking and adhering, including the following steps: S1. Mix pulverized coal and iron ore powder and then cold press them to form the first iron coke green ball; S2. Spray anti-coke on the surface of the first iron coke green ball. The adhesive dispersion is used to obtain the second iron coke green balls, and the anti-sticking agent dispersion is cement dispersion and / or slaked lime dispersion and / or metallurgical lime dispersion; S3. The second iron coke green balls are retorted to obtain iron coke products. . The anti-adhesion process used is simple and effective, and the anti-adhesion agent used is easy to obtain and cheap. It can effectively prevent the carbonization and bonding phenomenon of cold-pressed iron coke and greatly improve the yield of iron coke.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for preventing cold-pressed iron from coking and sticking. Background technique [0002] In recent years, the global climate has changed abnormally, the greenhouse effect has intensified, and CO 2 Emission reduction is considered to be an effective means to deal with abnormal climate change. The iron and steel industry is a major contributor to carbon emissions in the country. Among them, the blast furnace ironmaking system CO 2 Emissions account for 80% of the entire steel production process, therefore, the blast furnace is the steel industry's CO 2 key to reducing emissions. However, at present, relying on technologies such as fine material, high wind temperature, and oxygen-enriched coal injection to realize energy-saving and emission-reduction potentials of blast furnaces is approaching the limit, and it is difficult to truly break th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C21B13/00
CPCC21B13/008C22B1/2406
Inventor 储满生鲍继伟柳政根王宏涛赵伟唐珏韩冬曹来更
Owner NORTHEASTERN UNIV LIAONING
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