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Coke passivator and preparation method thereof

A technology of passivating agent and coke, which is applied in the field of ironmaking, can solve the problems of high energy consumption, high cost, single raw material composition, etc., and achieve the effects of reducing reactivity, improving utilization coefficient and life, and improving strength after reaction

Active Publication Date: 2008-05-28
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the current coke passivators have the following problems: single raw material composition, high cost; a certain passivation effect can only be achieved under the premise of a large amount of use, and the energy consumption is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Boric acid (B 2 o 3 ≥48.5%), borax (B 2 o 3 ≥35%), high magnesium powder (MgO≥85%), silicon aluminum powder (SiO 2 ≥40%, Al 2 o 3 ≥30%), silicon calcium powder (SiO 2 ≥30%, Al 2 o 3 ≥25%) were mixed according to the mass ratio of 30:20:40:5:5, and then concentrated to B under the condition of strong stirring 2 o 3 , MgO, CaO, SiO 2 、Al 2 o 3 The total mass content is not less than 80%. After drying at 250°C for 30 minutes, it is cooled until the material temperature is not higher than 30°C. After packaging, it is the finished product.

[0021] The coke deactivator is formulated into an aqueous solution with a mass concentration of 6%, and then sprayed on the coke according to the amount of 0.3kg of coke deactivator per ton of coke, and the reactivity of coke is reduced per ton of coke during combustion 5%, increasing the post-reaction strength by 7.1%.

Embodiment 2

[0023] Mix boric acid, borax, high-magnesium powder, silicon-aluminum powder, and silicon-calcium powder in a mass ratio of 20:20:40:10:10, and then concentrate to B under strong stirring. 2 o 3 , MgO, CaO, SiO 2 、Al 2 o 3 The total mass content is not less than 80%. After drying at 280°C for 30 minutes, it is cooled until the temperature of the material is not higher than 30°C. After packaging, it is the finished product. The purity of each raw material is the same as in Example 1.

[0024] The use method of coke deactivator is the same as example 1, and every ton of coke reduces coke reactivity by 3.8% in the combustion process.

[0025] Increases post-reaction strength by 5.5%.

Embodiment 3

[0027] Mix boric acid, borax, high-magnesium powder, silicon-aluminum powder, and silicon-calcium powder in a mass ratio of 20:20:30:10:20, and then concentrate to B under strong stirring. 2 o 3 , MgO, CaO, SiO 2 、Al 2 o 3 The total mass content is not less than 80%. After drying at 300°C for 30 minutes, it is cooled until the temperature of the material is not higher than 30°C. After packaging, it is the finished product. The purity of each raw material is the same as in Example 1.

[0028] The method of using the coke deactivator is the same as that in Example 1. During the combustion process, the coke reactivity per ton of coke is reduced by 7.1%, and the post-reaction strength is increased by 8.7%.

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Abstract

The invention belongs to the technical field of ironmaking, in particular relating to a coke passivator and process for preparation. The coke passivator is produced by the raw materials at different part by weight, including 15-30 parts of boracic acid, 15-30 parts of borax, 30-50 parts of high magnesium powder, 5-15 parts of aluminum silicon powder, and 5-20 parts of calcium silicon powder. The coke passivator can uniformly form a layer of protective coating, which can reduce the erosion of the coke caused by CO2, decrease the reactivity of the coke, increase the coke strength after reaction, improve the utilization coefficient and the service life of the blast fumace and reduce the coke ratio. Utilizing the concentration of 0.3kg / t can reduce the reactivity of the coke by 5%, increase the coke strength after reaction by 7% and improve the production of the blast furnace by more than 3%-5%. The invention is an ideal product for blast furnace ironmaking which has the advantages of saving energy, reducing consumption, increasing production, improving benefits and protecting environment.

Description

(1) Technical field [0001] The invention belongs to the technical field of ironmaking, in particular to a coke passivator and a preparation method thereof. (2) Background technology [0002] Coke is an important fuel for blast furnace smelting, and plays an important role in the blast furnace as heat source, reducing agent, carburizing agent and material column skeleton. In the high-temperature zone above the refractory zone of the blast furnace body, the reaction is intensely carried out on the pore surface of the coke. The better the reactivity of the coke, the greater the melting loss, which makes the coke form a large number of pores and the pore wall becomes thinner, and the high-temperature strength decreases. , a large amount of powder is produced, which significantly weakens the skeleton and supporting effect of coke. In the blast furnace, the central airflow becomes weaker, the edge airflow increases, the dead material column in the center of the hearth increases, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10C21B3/02
Inventor 王庆来楚永法姜存玉夏国丰杨玉芹武金波陈玉设
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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