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Method for preparing iron coke

A technology of iron coke and iron ore powder, which is applied in the field of iron coke preparation, can solve the problems of iron coke yield reduction, erosion, and the mechanical strength of iron coke cannot meet the production demand, and achieve the effect of improving mechanical strength and yield

Active Publication Date: 2019-08-06
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it was found that during the carbonization process of iron coke, the yield of iron coke would decrease due to volatilization analysis, shrinkage of semi-coke and excessive iron ore reduction rate, and the mechanical strength of iron coke could not meet the production demand; The carbonization atmosphere used in the carbonization process of coke mostly contains CO 2 , there will be iron coke and CO in the carbonization atmosphere 2 Corrosion due to gasification reaction

Method used

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Examples

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Effect test

preparation example Construction

[0022] The invention provides a method for preparing iron coke, which specifically comprises the following steps:

[0023] Step S1, preparation of iron coke green pellets: uniformly mix iron ore powder and coal powder according to 10%-40% iron ore powder, 55%-80% bituminous coal and 5%-10% anthracite, and heat to 60-150°C to obtain The first mixture; spray 5-7% steam-heated asphalt into the first mixture and mix evenly to obtain the second mixture; roll the second mixture with a pressure of 3t / cm-6t / cm Press molding to obtain raw iron coke balls.

[0024] 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 mi...

Embodiment 1

[0054] This embodiment provides a method for preparing iron coke, which includes the following steps:

[0055] Step S1, prepare iron coke green pellets with the same preparation method as in Comparative Example 1.

[0056] Step S2, preparation of iron coke products: put iron coke green pellets into the shaft furnace, 2 Dry distillation is carried out under the mixed atmosphere of CO and CO. 2 The partial pressure of the gas is 10%; iron coke green balls are heated in the shaft furnace from room temperature to 550°C at a heating rate of 3°C / min, then heated from 550°C to 1000°C at a heating rate of 5°C / min, and then kept at a constant temperature for 4 hours. Iron coke products are obtained after cooling.

[0057] After testing, the compressive strength of the iron coke product in Example 1 is 3542N, and the type I drum index was 80.3%, The drum index is 83.5%, the carbonization weight loss rate is 31.5%, and the finished product rate is 100%.

Embodiment 2

[0059] This embodiment provides a method for preparing iron coke, which includes the following steps:

[0060] Step S1, prepare iron coke green pellets with the same preparation method as in Comparative Example 1.

[0061] Step S2, preparation of iron coke products: put iron coke green pellets into the shaft furnace, 2 Dry distillation under the mixed atmosphere of CO, CO 2 The partial pressure of the gas is 7.5%; iron coke green balls are heated in the shaft furnace from room temperature to 550°C at a heating rate of 3°C / min, then heated from 550°C to 1000°C at a heating rate of 5°C / min, and then kept at a constant temperature for 4 hours. Iron coke products are obtained after cooling.

[0062] After testing, the compressive strength of the ferrocoke product in Example 2 is 3603N, and the type I drum index was 81.1%, The drum index is 83.9%, the carbonization weight loss rate is 31.0%, and the finished product rate is 100%.

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Abstract

Provided is a method for preparing iron coke. Iron coke green balls are subjected to destructive distillation in the mixed atmosphere of CO2 and CO, and the iron coke is prepared. In the mixed atmosphere, the partial pressure of CO2 is 10% or below. The iron coke green balls are briquettes formed by mixing and pressing baring powder coal and iron ore powder. The process is easy to operate, the phenomena that in the iron coke carbonization process, cracks are generated, and the iron coke is eroded by CO2 can be effectively avoided, the mechanical strength of the iron coke is improved, and the yield of the iron coke is increased.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for preparing iron coke. Background technique [0002] Iron coke is a new type of composite ironmaking charge, because of its wide source of raw materials, high comprehensive utilization of resources, it can reduce the fuel ratio of blast furnaces and reduce CO 2 Emissions and other advantages have become a hot research topic for Chinese and foreign scholars. Iron coke refers to a carbon-iron composite charge obtained by mixing iron-containing substances and coal evenly, and then forming, carbonizing in a coke oven or shaft furnace. The raw materials for preparing iron coke are iron-containing materials such as metallurgical iron-containing waste, low-grade iron ore, iron concentrate, and non-coking coal powder such as weakly caking coal and non-caking coal. The source of raw materials and comprehensive utilization of waste materials; and ...

Claims

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Application Information

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IPC IPC(8): C21B5/00C10B53/08C10B53/04
CPCC10B53/04C10B53/08C21B5/00
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
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