Coking coal blending method for controlling M10 index of cokes

Abstract

The invention discloses a coking coal blending method for controlling an M10 index of cokes. According to the method, each single coal comprises the following components in percentage by weight: 10 to 15 percent of gas coal, 0 to 10 percent of gas-fat coal, 10 to 15 percent of fat coal, 20 to 30 percent of 1 / 3 coking coal, 40 to 50 percent of coking coal and 5 to 10 percent of lean coal, wherein the sum of the gas-fat coal and the fat coal is smaller than or equal to 20 percent and the sum of the gas-fat coal and the fat coal with 34 percent of volatile matter is smaller than or equal to 15 percent. According to the invention, when a gas and coal blending proportion is high, types and the proportion of coal which participates in blending are selectively regulated according to different properties of high-cohesiveness coal types; by controlling a low metamorphic degree and the total quantity of coal types with high content of volatile matter, generation of a large pore structure at the center of a coke cake is reduced under the condition of ensuring that coal blending has a certain cohesiveness, so that the aim of controlling M10 of the cokes is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of coking coal blending, in particular to a method for controlling coke M 10 Index coking coal blending method Background technique [0002] As the fuel, skeleton and reducing agent in the blast furnace, coke is an indispensable raw material for the operation of the blast furnace. With the development of large-scale blast furnaces, intensified smelting and oxygen-enriched injection technology, blast furnace coke quality requirements are getting higher and higher, and the focus is also changing. From the beginning of the pursuit of cold strength (crushing strength M 40 , abrasion resistance M 10 ) to mid-term pursuit of thermal performance (reactive CRI, post-reaction strength CSR). However, with the continuous improvement of coke strength after reaction, its improvement of the antegrade stability of the blast furnace has reached a bottleneck, and in such an environment, the wear resistance M of the cold ...

AI Technical Summary

Problems solved by technology

For example, gas coal is coke M 10 This is because, on the one hand, gas coal is a weakly cohesive coal, and the cohesiveness of the blended coal will be reduced after blending, resulting in an increase in coke powder after the blended coal is coked. M 10 The second is that the volatile content of gas coal is high. When the ratio is high, it may cause large pores in the center of the coke cake, and the pore walls are thin, resulting in reduced wear resistance. M 10 deterioration