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Blast furnace ironmaking raw material and method for preparing same

A blast furnace ironmaking and raw material technology, which is applied in the field of iron and steel metallurgy, can solve problems that do not involve improving the quality of sintered ore, difficult sintering mixture granulation, and low sintering strength, so as to improve mineral composition and structure and reduce fuel consumption. , Improve the effect of metallurgical properties

Inactive Publication Date: 2010-09-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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AI Technical Summary

Problems solved by technology

Because the concentrate has a coarse particle size and poor hydrophilicity, it is difficult to granulate the sintered mixture and the gas permeability of the material layer is poor; because the concentrate TiO 2 The weight content is high, and a brittle perovskite (CaO·TiO 2 ), resulting in low sinter strength and high return rate
At present, some iron and steel enterprises at home and abroad use both sintered ore and pelletized ore in the ironmaking production of ordinary ore, but it is only from the perspective of optimizing the structure of the blast furnace charge, and it does not involve the purpose of improving the quality of sintered ore.

Method used

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  • Blast furnace ironmaking raw material and method for preparing same

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preparation example Construction

[0021] The preparation method of blast furnace ironmaking raw material according to the embodiment of the present invention comprises preparing TiO 2 A step of sintering ore with a content of 5.91% to 4.7% and a step of preparing pellets.

[0022] Can be made of TiO 2 Sintered ore is prepared from sintered raw materials with a content of 5.91% to 4.7%, wherein the sintered raw materials may contain high TiO 2 (Content 12%~13%) Vanadium Titanium Magnetite Concentrate, Low TiO 2 (Content 10%~11%) Vanadium Titanium Magnetite Concentrate, TiO 2 Steel slag with 2% content, return ore with the same composition as sinter and no TiO 2 Iron ore powder, flux and sinter fuel. High TiO 2 Vanadium Titanium Magnetite Concentrate and Low TiO 2 The sum of vanadium-titanium magnetite concentrate can account for 42%-45% of the total weight of sintering raw materials, the weight of steel slag can account for 3.2% of the total weight of sintering raw materials, and the weight of returned or...

Embodiment 1

[0026] Preparation of sinter

[0027] First, prepare TiO 2 The raw material for sintering with a content of 5.91% uses limestone and quicklime as the sintering flux, coke oven gas as the ignition fuel, and coke powder as the sintering fuel. 2 The belt-type sintering machine sinters the sintering raw material, and the sintering air volume is 92m 3 / m 2 ·min, the negative pressure of the supervisor is 12600Pa. After the sintering is completed, the sintered ore is unloaded from the tail of the machine, crushed by a single-roller crusher, then screened by a thermal vibrating screen, then cooled by a ring cooler, and finally screened by a fixed screen. After being sieved by a fixed sieve, the sintered ore with a particle size of not less than 10 mm is used as a part of the blast furnace ironmaking raw materials according to this embodiment (among them, a small part of sintered ore with a size of 10 mm to 16 mm is separated as the bottom material for the sintering machine), and...

Embodiment 2

[0044] The raw materials for blast furnace ironmaking were prepared in the same manner as in Example 1, except that the proportioning percentage of sintered raw materials and the weight ratio of sintered ore to pellets were different. Wherein, the proportioning percentage of embodiment 2 is as shown in table 1, and in sintering raw material and sintering ore, TiO 2 The content of sintered ore is 5.50%, and the weight ratio of sintered ore and pelletized ore is 75:25.

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Abstract

The invention relates to a blast furnace iron making raw material and a preparing method for the same. The blast furnace iron making raw material contains a sinter and a pellet, wherein the weight content of TiO2 in the sinter is from 5.91 to 4.7 percent. The preparing method for the blast furnace iron making raw material only involves the structural adjustment of sintering feed without reconstructing the site technical process with high feasibility.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a blast furnace ironmaking raw material and a preparation method thereof. Background technique [0002] Iron concentrate powder, plus fuel (coke powder or anthracite) and flux (limestone or lime) are roasted and agglomerated products—sinter ore, which is the "clinker" necessary for blast furnace ironmaking. Because of the high TiO 2 Type Vanadium-Titanium Magnetite Concentrate with TiO 2 High weight content (12% ~ 13%), SiO 2 Low, coarse particle size, unreasonable composition, poor hydrophilicity, etc., so the ore belongs to the refractory minerals. Because the concentrate has a coarse particle size and poor hydrophilicity, it is difficult to granulate the sintered mixture and the gas permeability of the material layer is poor; because the concentrate TiO 2 The weight content is high, and a brittle perovskite (CaO·TiO 2 ), resulting in low sinter strength and high r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C22B1/14
Inventor 甘勤杜炽何群文永才饶家庭杜德志刘龙全
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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