Blast furnace iron-smelting method

A technology of blast furnace ironmaking and blast furnace smelting, which is applied in the field of blast furnace smelting, can solve problems such as difficulty in blast furnace smelting and reduction of technical and economic indicators, and achieve the effect of increasing vanadium content in molten iron and reducing production costs

Inactive Publication Date: 2008-09-10
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

However, after increasing the usage of vanadium-titanium magnetite, it is difficult to

Method used

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Embodiment Construction

[0011] The following describes but does not limit the present invention through the description of specific embodiments of the ironmaking method of the present invention.

[0012] The blast furnace smelting of Panzhihua Iron and Steel Group Corporation adopts the following process:

[0013] A. Preparation of sinter: the sinter raw material contains the following components by weight ratio, 50-55% of vanadium-titanium magnetite concentrate, 25-30% of ordinary iron ore, 20% of fuel and flux;

[0014] B. Pellet making: 30-40% of ordinary iron ore and 60-70% of vanadium-titanium magnetite concentrate are mixed to produce pellets; the main purpose of using ordinary ore in the preparation of pellets is to improve the quality of pellets grade and quality of pellets.

[0015] C. Blast furnace smelting: the blast furnace charge contains the following components by weight: 67% of sintered ore prepared in step A, 28% of pellet ore, and 5% of ordinary lump ore.

[0016] The blast furnac...

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Abstract

The invention belongs to the blast furnace ironmaking field and particularly relates to a new blast furnace ironmaking method by adopting common iron ore and vanadium titanium magnet to make iron, thereby not only guaranteeing the grade as fired but also lowering the production cost. When sintering ore is prepared by the method, the raw materials are mixed according to the following proportioning by weight: vanadium-titanium magnetite ore concrete of ranging from 35 to 50 percent, common iron ore of ranging from 30 to 45 percent, and fuel and fusing agent of 20 percent; part of the vanadium-titanium magnetite ore concrete is made into pellet ore independently; in the blast furnace ironmaking process, the pellet ore is mixed with the sintering ore and common lump ore to make iron, the blast furnace charging materials are mixed according to the following proportioning by weight: sintering ore of ranging from 60 to 65 percent, vanadium-titanium magnetite pellet ore of ranging from 25 to 35 percent, and common lump ore of ranging from 5 to 10 percent, wherein, the common lump ore contains bixbyite of about 2 percent. The method increases the use ratio of the vanadium-titanium magnetite by optimizing the furnace charging material structure, makes the best of the rich vanadium-titanium magnetite resources, lowers the production cost of the blast furnace ironmaking, and effectively increases the vanadium content in the molten iron, thereby having positive effects.

Description

technical field [0001] The invention belongs to the field of blast furnace smelting, and in particular relates to blast furnace ironmaking by using ordinary iron ore and vanadium-titanium magnetite concentrate. Background technique [0002] At present, Chengde Iron and Steel Company and Panzhihua Iron and Steel Group Company mainly use vanadium-titanium magnetite for blast furnace smelting. The slag produced in the smelting process of Chengde Iron and Steel Company is mainly medium-titanium slag, and TiO in slag 2 At 15-18%; the slag produced during the smelting process of Panzhihua Iron and Steel Group Company is mainly high-titanium slag, and TiO in the slag 2 At 21-23%. In recent years, in order to improve the grade of the blast furnace, the proportion of ordinary iron ore used in smelting has been gradually increased, and the proportion of vanadium-titanium magnetite used has been gradually reduced. 2 The content gradually decreases from more than 10% to 7-8%, and the ...

Claims

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Application Information

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IPC IPC(8): C21B5/00C22B1/16
Inventor 付卫国
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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