Hot-pressed iron coke for ironmaking and preparation method thereof

Abstract

The invention belongs to the technical field of ironmaking, and specifically relates to a hot pressed iron coke for ironmaking and a preparation method thereof. The raw materials are composed of 10% to 30% iron ore powder, 60% to 80% bituminous coal powder, and 10% to 20% anthracite coal powder; the raw materials are fully mixed to obtain a mixture, and the mixture is heated in a heating furnace to 200-350°C, quickly hot-press and shape it to produce hot-pressed iron coke green pellets. Place the iron coke green pellets in a tunnel kiln to heat up to a certain temperature at a certain rate for high-temperature carbonization, then take out the stewed material and cool it to obtain hot-pressed iron coke green pellets. Iron coke. The prepared hot-pressed iron coke has excellent compressive strength, wear resistance, reactivity and post-reaction strength. It can replace part of the coke in blast furnace ironmaking and improve the adaptability of blast furnace ironmaking to fuel. It has a wide range of raw material sources, low production cost, simple process flow and no need to use binders, and has broad industrial application prospects.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a hot-pressed iron coke for ironmaking and a preparation method thereof. Background technique [0002] my country's coal resources have a complete range of coal types, including coals of various coalification stages from lignite to anthracite, but the quantity and distribution are extremely uneven, especially for coking coal, which is relatively small, due to ash content, sulfur content, selectivity, etc. For this reason, high-quality coking coal is even more scarce. Blast furnace smelting requires a large amount of high-quality metallurgical coke. With the rapid development of my country's iron and steel industry, the demand for coke is gradually increasing. Due to the uneven distribution of coking coal resources in my country, the coke production is strictly limited due to the high energy consumption of the coking process and serious environmental pollution, a...

AI Technical Summary

Problems solved by technology

[0012] (1) Carbonization is carried out in a vertical carbonization furnace for the preparation of iron coke, which requires rebuilding the vertical carbonization furnace, which requires a large investment and is not suitable for domestic production, and the gas used in the preparation process needs to be processed multiple times. The whole process is relatively complicated and the output lower;

[0013] (2) Some methods need to use expensive binders to ensure the strength of iron coke, which increases the cost sharply. At the same time, inorganic binders contain impurity elements such as Na, K, Cl, etc., organic binders do not have high temperature strength, and composite adhesives The binder contains high Si elements, and the ash content increases;

[0014] (3) Some methods use metal waste liquid immersion to improve the reactivity of iron coke, because the waste liquid contains more metals such as nickel and zinc, if the blast furnace uses this iron coke for a long time, the life of the blast furnace will be reduced;

[0015] (4) Some methods use coke ovens for production, and the service life of most coke ovens in China is about to expire, and the investment in new construction or renovation of coke ovens is large, so it is not suitable for popularization and use;

[0016] (5) Some methods add nearly half or more coking coal, which has limited coke saving effect and limits the promotion and use of coking coal-free areas.

In addition, some methods have higher requirements on the performance of raw materials, thus limiting the range of raw materials

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