Blast furnace injection pulverized coal preparation method with semi-coke as blast furnace injection raw material

Abstract

The invention relates to a blast furnace injection pulverized coal preparation method with semi-coke as a blast furnace injection raw material. The method adopts the semi-coke as the raw material forpreparing blast furnace injection pulverized coal; and in addition, before the semi-coke is made into pulverized coal finally through a medium-speed mill, the step that the semi-coke is separately manufactured into semi-coke prefabricated powder is included. According to the method, the step of preparing the semi-coke prefabricated powder is added based on an existing blast furnace injection powder preparation technology, thus, the particle size difference is formed between semi-coke particles and soft coal, the grinding effect of the semi-coke particles is improved, the problem that in the existing technologies, semi-coke is difficult to ground is solved, accordingly, the soft coal and the semi-coke can be ground into powder at the same time, and efficient injection of a blast furnace isachieved finally; and in addition, the corner angle sharpness of the semi-coke particles can be perfected by preparing the semi-coke prefabricated powder, the edges of the semi-coke particles are smooth, and the effect of relieving abrasion of transport injection equipment in the follow-up injection process is well achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing blast furnace injection coal powder by using semi-coke as a blast furnace injection raw material. Background technique [0002] The popularization and application of blast furnace injection coal technology has achieved huge economic benefits and has been widely recognized. With the increasing domestic iron and steel production capacity and the continuous improvement and improvement of the key technology of blast furnace pulverized coal injection, the market demand is gradually expanding. status is increasing. [0003] At present, the raw materials for blast furnace injection in my country mainly include anthracite, low-volatile bituminous coal (lean coal and lean coal), and high-volatile bituminous coal (mainly long-flame coal, non-sticky, weakly sticky coal, and some gas coal). At present, these three types of coal blending are mostly used in the indu...

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Problems solved by technology

[0008] Aiming at the defects in the prior art, the purpose of the present invention is to provide a method for preparing blast furnace pulverized coal by using semi-coke as a raw material for blast furnace injection, so as to solve the problem of difficult grinding of semi-coke in the existing process, and improve semi-coke The sharpness of the edges and corners of the particles makes the edges smooth, thereby reducing the wear on the conveying and blowing equipment during the subsequent blowing process

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