Coking coal modifier

Abstract

The invention discloses a coking coal modifier. The coking coal modifier mainly comprises the raw materials as follows according to weight percent: 40% to 70% of boric acid, 10% to 20% of antimony oxide and 20% to 40% of moderate-temperature modified asphalt, and the coking coal modifier is prepared by mixing the raw materials. When the coking coal modifier provided by the invention is added during the coking process of coking coal, the reactivity of coke can be reduced effectively, and the strength of reacted coke can be improved; when the coking coal modifier provided by the invention is used during coal injection of coking, the use amount of coking coal, rich coal and other high-quality coking coal can be reduced greatly, the use amount of lean coal, gas coal and other coal with poor caking performance can be increased, even the use amount of non-caking coal can be increased, and high-quality and qualified coke can be obtained, so that the cost of coking can be reduced remarkably. The coking coal modifier provided by the invention can effectively change the molecular structure of coal to achieve the purposes that coke has good coking effect and high coking density and strength, the thermal response of coke can be reduced effectively and the thermal intensity of coke can be improved; and by adoption of the coking coal modifier provided by the invention, the use amount of high-quality coking coal can be reduced, and energy can be saved. Therefore, the coking coal modifier has remarkable economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the field of coal processing, and in particular relates to a coking coal modifying agent for improving coke quality, that is, a coking coal additive. Background technique [0002] With the further increase of blast furnace smelting intensity, and the application of intensified smelting technologies such as large-scale blast furnaces and large coal injection, the requirements for raw materials of blast furnaces have gradually increased, that is, the quality of coke (main indicators are M40, M10, CRI, CSR) has been raised. higher and higher requirements. At present, most of them use high-quality coking coal in a large proportion to achieve the purpose of refining high-quality coke. However, as high-quality coking coal resources become more and more scarce, weak caking coal must be used for coking. For the defects of poor caking performance in weak caking coking coal, although corresponding technological measures (such as tampin...

AI Technical Summary

Problems solved by technology

For the defects of poor caking performance in weak caking coking coal, although corresponding technological measures (such as tamping coking, coal blending, coal humidity control, coke oven large-scale, CDQ, etc.) can be improved coke quality), but its process is complex, costly and limited in effect

[0003] At present, in order to improve the quality of coke in coking coal, additives are often used in the coking process. The additives used are generally some caking substances (such as pitch, tar, residual oil, pulp waste liquid, etc.), the principle is Use the caking property of additives during coking to improve the quality of coking coal, so as to achieve the purpose of improving the quality of coke, but the addition ratio is relatively high (generally as high as 1% or more), the treatment process is more complicated, and the cost is higher