Low-cost blast furnace iron-smelting method

A blast furnace ironmaking, low-cost technology, applied in the field of iron and steel metallurgy, can solve the problems of low indirect reduction degree of iron ore, less CO2 production, low calorific value, etc. Effect

Active Publication Date: 2012-05-09
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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Problems solved by technology

Compared with top-charging coke, tamping coke has a dense structure and high strength, but it has poor reactivity in the blast furnace, low calorific value, and less CO generation, which reduces the indirect reduction degree of iron ore. It was once neglected by iron-making enterprises , even reject

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Embodiment Construction

[0018] A low-cost blast furnace ironmaking method, using semi-coke (semi-coke) and stamped coke for blast furnace ironmaking. Lump semi-coke (semi-coke) is evenly mixed with ore, then layered with tamped coke and loaded into the blast furnace for blast furnace ironmaking. After the small particle size or powdery semi-coke (semi-coke) is crushed to the injection particle size requirement, it can replace the high-quality anthracite (or lean coal, lean coal) for injection with high price and tight resources and inject it into the blast furnace alone or mixed with coal powder . In the process of blast furnace ironmaking, the quality indicators of stamped coke required by blast furnaces with different volumes can be referred to in Attached Table 1.

[0019] The weight ratio of the massive semi-coke of the present invention to the ore is about 1:20~1:200, and the quality index of the described massive semi-coke satisfies A d ≤13%; S t，d ≤0.8%; M 25 ≥30%; M 10 ≤30%; CSR 35 (wit...

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Abstract

The invention relates to a low-cost blast furnace iron-smelting method, which is characterized in that: blocky carbon-lan (semi-coked) and rammed coke are matched and used for blast furnace iron smelting, and at the same time, small-particle or powdery carbon-lan (semi-coked) is used as an injected fuel to be used for blast furnace iron smelting. In the method, rammed coke is adopted, thus the consumption of high-quality coking coal is reduced, and the cost of the coking blend is lower than that of the top charging coke; and at the same time, a part of non-coking coal carbonization product, namely carbon-lan (semi-coked) is matched, thus the production cost of steel enterprises is lowered to a greater extent and high-quality coking coal is saved. In addition, small-particle or powdery carbon-lan (semi-coked) is used as the injected fuel, thus the problems that anthracite, lean coal and meager lean coal resources are limited and expensive are alleviated and the production cost of the steel enterprises is further lowered. According to the invention, the problems of shortage in high-quality coking coal resources and high-quality blowing coal resources in China are solved to a certain extent, and a new way is opened for persistent health development of the steel enterprises.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a fuel selected in blast furnace ironmaking production. Background technique [0002] Coke is an important fuel for blast furnace smelting. In recent years, the large-scale blast furnace and the use of low coke ratio ironmaking have put forward higher requirements for coke strength indicators. For the metallurgical coke produced by the conventional coking process, the amount of high-quality coking coal and fat coal must be increased in order to increase the coke strength. China’s coke production capacity is large, and high-quality coking coal and fat coal are in short supply. These factors lead to high prices for high-quality coking coal and excessive production costs for metallurgical coke. high. [0003] In order to save high-quality coking coal, reduce the production cost of blast furnace ironmaking in iron and steel enterprises, and at the same time ensure the quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 孟庆波战丽徐秀丽
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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