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Blast-furnace operation method

A blast furnace operation and blast furnace technology, applied in blast furnaces, blast furnace details, furnaces, etc., to achieve the effects of reducing the ratio of reducing materials, promoting reduction, and improving ventilation

Active Publication Date: 2014-07-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, according to Non-Patent Document 1, it is known that the reduction rate of sintered ore in the clad layer is about 65 to 70%, and the reduction has not been completed.

Method used

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  • Blast-furnace operation method

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Embodiment

[0062] A blast furnace operation test to which the method of the present invention was applied was carried out. The iron coke used is produced by molding a mixture of coal and ore with a molding machine, putting it into a vertical combustion furnace, and performing dry distillation. The size of the above-mentioned iron coke is a printed box type of 30×25×18mm. In addition, the iron content in iron coke was set to 30% by mass.

[0063] Raw material charging to the blast furnace first forms a coke layer consisting of only coke oven coke, and an ore layer mixed with coke (iron coke and / or coke oven coke) is charged in two batches. As the ore layer, three kinds of charging were performed (test No. 1-3).

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Abstract

Coke layers and ore layers are formed in the blast furnace. The coke layer is formed of coke oven coke, and the ore layer is formed of iron coke, coke oven coke and ore. The mixing ratio of coke oven coke to the ore in the ore layer is 0.5% by mass or more. The stagnation of the gasification reaction of iron coke in the clad layer can be suppressed.

Description

technical field [0001] The present invention relates to a method for operating a blast furnace when using iron coke produced by molding and dry distillation of a mixture of coal and iron ore. Background technique [0002] In order to reduce the reducing material ratio of the blast furnace, an effective method is to use iron coke as a raw material for the blast furnace, and utilize the temperature-lowering effect of the heat preservation of the blast furnace caused by the use of iron coke (for example, refer to Patent Document 1). The iron coke produced by mixing coal and iron ore and dry-distilling the molded product promotes the reduction of sintered ore due to its high reactivity, and because it contains a part of the reduced iron ore, it can reduce the heat preservation zone temperature of the blast furnace, It is possible to reduce the reducing material ratio. [0003] As a method of operating a blast furnace using iron coke, as disclosed in Patent Document 1, there is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00
CPCC21B5/007C21B5/008C21B5/00
Inventor 佐藤健野内泰平藤本英和庵屋敷孝思佐藤秀明
Owner JFE STEEL CORP
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