Preparation method of high strength-hyper reactivity iron containing coke

Abstract

The invention relates to a preparation method of high strength-hyper reactivity iron containing coke. The preparation method comprises the steps of screening twice to obtain a proper coal sample, drying the coal sample together with iron ore powder which is less than 74 microns in granularity and is taken as a catalyst, and uniformly mixing to obtain a mixed material, adding water which is 9-11% of the mass of the mixed material in a coking reaction tank, and smashing and sealing to obtain a coal cake, wherein the iron ore powder is 0-15% of the mass of the mixed material and stacking density of the mixed material in the coking reaction tank is 950-1150kg / m<3>, rapidly placing the coking reaction tank in the center of a hearth when heating a coke oven to 800 DEG C, increasing temperature of the oven to 1000-1100 DEG C and preserving the heat for 6-8 hours, taking coke out of the reaction tank, and cooling to obtain the high strength-hyper reactivity iron containing coke. The iron containing coke which is close to conventional coke in strength is prepared under a condition that a binding agent is not added, thus reducing addition quantity of strongly adhesive coal in coking coal; the preparation method is low in slag generation in a blast furnace iron-making process in comparison with high-calcium coal coke, and enhances loss reaction of the coke.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing high-strength-high-reactivity iron-containing coke. Background technique [0002] With the rapid development of my country's iron and steel industry, the demand for coke is gradually increasing. Although my country's coal resources are rich in reserves and coal types are complete, among the coal types used in coking, gas coal with weak cohesiveness and 1 / 3 Mainly coking coal, with strong caking coal (such as fat coal and main coking coal) accounting for less than 30%. At the same time, since about 30% of coking coal is high-sulfur and high-ash coal, there are fewer coking coals that are easy to select. Research on how to reduce the fuel ratio of the blast furnace and reduce the usage of strong caking coal has become a major issue in the production of metallurgical industry. [0003] Taking the Rist operation line as the theoretical basis,...

AI Technical Summary

Problems solved by technology

Due to the cyclic enrichment of alkali metals in the blast furnace, the lining of the blast furnace is nodulated, which affects the smooth running of the blast furnace. Therefore, the industrial practicability of coke with alkali metals as additives is relatively small.

In 2006, Japanese scholars studied high-calcium coal and coking coal mixed coking to obtain high-reactivity coke, and successfully applied it to blast furnace production. However, because high-calcium coal increased the slag alkalinity to a certain extent, resulting in an increase in the amount of slag blast furnace coke ratio

Although the above method avoids the danger of damaging the furnace lining due to the low melting point substances produced by the iron and silicon refractory bricks when the iron coke is prepared by the chamber coke oven, the problem with this method is that it needs to use expensive binders to ensure the strength of the coke. Increase the cost; the gas used in the preparation process needs to be processed many times, and the whole process is more complicated; the output of this process is low

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