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A method for preparing high-strength metallurgical coke by upgrading Xinjiang coal

A metallurgical coke, high-strength technology, used in coke ovens, petroleum industries, etc., can solve the problems of increased coking and iron-making costs, low economic benefits, etc., and achieve the effect of improving thermal strength.

Active Publication Date: 2017-06-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the plight of "coking coal but no high-strength coke" in Xinjiang, almost all large iron and steel enterprises in Xinjiang have to purchase coke or coking coal remotely from outside Xinjiang (Ningxia, Inner Mongolia, Shanxi, etc.). The proportion of coke used is even as high as 80% or above, resulting in increased coking and ironmaking costs and low economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The modifier uses a mixture of various boron-carbon compounds, and the mixture of boron-carbon compounds and Xinjiang coal is mixed with coking coal: Xinjiang Hongyang 15JM accounts for 44.5%, Tuokexun 1 / 3JM accounts for 32.7%, 25JM accounts for 15.7%, Turtle QM accounted for 5.9%, boron carbide B 13 C 3 , B 12 C 2 and B 13 C 2 0.4% each.

[0020] After the above-mentioned coking blend coal is mixed and compacted into briquettes of specified density, coking is carried out according to the conventional stamping coking process, and the thermal state performance test of coke, that is, the test method of coke reactivity and post-reaction strength is carried out in accordance with the national standard GB / T 4000-2008.

[0021] The test results of thermal performance indicators of the refined coke: CRI: 29.7%, CSR: 69.8%; compared with the coke sample (CRI: 50.4%, CSR: 43.5%) with the same experimental conditions, the same proportion, and no modifier In contrast, coke C...

Embodiment 2

[0023] A boron-carbon compound is used as a modifier, coking blend coal composed of boron-carbon compound and Xinjiang coal: Xinjiang Hongyang 15JM accounts for 44.6%, Tuokexun 1 / 3JM accounts for 32.7%, 25JM accounts for 15.8%, and Qiuci QM accounts for 5.9% %, boron carbide B 5 C accounts for 1.0%.

[0024] After the above-mentioned coking blend coal was mixed and compacted uniformly to form a briquette of specified density, coking was carried out according to the conventional stamping coking process, and the coke thermal performance detection was the same as that in Example 1.

[0025] The test results of thermal performance indicators of the refined coke: CRI: 33.4%, CSR: 65.1%; compared with the coke sample (CRI: 50.4%, CSR: 43.5%) with the same experimental conditions, the same proportion, and no modifier In contrast, coke CSR increased by 21.6%.

Embodiment 3

[0027] Boron (B) is used as modifier, coking blend coal composed of boron (B) and Xinjiang coal: Xinjiang Hongyang 15JM accounts for 44.6%, Tuokexun 1 / 3JM accounts for 32.7%, 25JM accounts for 15.9%, and Qiuci QM accounts for 16.0% %, modifier boron (B) accounts for 0.8%.

[0028] After the above-mentioned coking blend coal was mixed and compacted uniformly to form a briquette of specified density, coking was carried out according to the conventional stamping coking process, and the coke thermal performance detection was the same as that in Example 1.

[0029] The test results of thermal performance indicators of the refined coke: CRI: 31.3%, CSR: 67.5%; compared with the coke sample (CRI: 50.4%, CSR: 43.5%) with the same experimental conditions, the same proportion, and no modifier In contrast, coke CSR increased by 24.0%.

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Abstract

The invention discloses a method for preparing high-strength metallurgical coke from modified Xinjiang coal, belonging to the technical field of coal processing. A modifier for the modified Xinjiang coal is boron (B), calcium boride (CaB6) and a boron carbon compound; the boron carbon compound can be one or more than one of boron-enriched boron carbon compounds (B3C, B5C, B6C, B7C, B8C, B12C, B12C2, B13C, B13C2, B13C3 and B25C) and carbon-enriched boron carbon compounds (B12C13, BC2 and BC3). The modifier can consist of one, or any two or all of boron (B), calcium boride (CaB6) and the boron carbon compound. The use amount of the modifier is 0.1%-1.3% of the mass of coking coal. By adding the modifier into the coking coal to realize co-carbonization with the Xinjiang coal, the purpose of greatly improving the thermal strength of the Xinjiang coal coke can be reached, the thermal strength of the Xinjiang coal coke can be improved by 5%-26%, and the quality of the coke can meet high-quality requirement of a modern large blast furnace for coke.

Description

technical field [0001] The invention belongs to the technical field of coal processing, and in particular relates to a method for preparing high-strength metallurgical coke by upgrading Xinjiang coal. Background technique [0002] Coke is a silver-gray solid product with certain strength, blockiness, cracks and porosity obtained by heating coking coal to 950-1050°C under air-isolated conditions. Coke is mainly used as a raw material for blast furnace ironmaking in the iron and steel industry. Due to the increasing shortage of coking coal resources in my country, in order to reduce coke consumption, blast furnace ironmaking adopts intensified smelting methods such as injecting fuel (coal powder, heavy oil, natural gas, etc.) at the tuyeres and oxygen-enriched blast to reduce the coke ratio. The role of coke in the blast furnace as a heat source, reducing agent, and carburizing agent will be replaced by the fuel injected from the tuyere to a certain extent, but the coke’s rol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B57/04
Inventor 季焕林朱子宗汪子龙武强曾见华
Owner CHONGQING UNIV
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