Hot briquetted iron coke for iron-making and preparation method thereof

Abstract

The invention belongs to the technical field of iron-making and specifically relates to hot briquetted iron coke for iron-making and a preparation method thereof. The hot briquetted iron coke is composed of the following raw materials in percentage by mass: 10%-30% of iron ore powder, 60%-80% of pulverized soft coal and 10%-20% of pulverized blind coal. The preparation method comprises the following steps: thoroughly and evenly mixing the raw materials to obtain a mixture, heating the mixture in a heating furnace to 200-350 DEG C, performing instant hot briquetting on the mixture to obtain a hot briquetted iron coke green ball, putting the hot briquetted iron coke green ball in a tunnel kiln and performing high-temperature destructive distillation and carbonization at a certain temperature increased previously at a certain rate, and then taking out the braised material for cooling, thereby obtaining the hot briquetted iron coke. The prepared hot briquetted iron coke has excellent compressive strength, abrasive resistance, reactivity and post-reaction strength; the hot briquetted iron coke is used for blast furnace iron-making instead of partial coke, and therefore, the adaptability of blast furnace iron-making to fuels is improved. The preparation method of the hot briquetted iron coke is wide in raw material source, low in production cost, simple in process flow and free from the use of a binder, and has wide industrial application prospect.

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 coals, 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. This is due to the lack of high-quality coking coal. 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 has gradually increased. Due to the uneven distribution of coking coal resources in my country, the high energy consumption of the coking process and severe environmental pollution in coke production are strictly limited, and the rapid development of t...

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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