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Pellet with high FeO content and preparation method of pellet

A technology of pellets and raw pellets, applied in the field of high-FeO pellets and their preparation, can solve the problems of impacting the smooth running of blast furnaces, low pellet strength, and poor air permeability of blast furnace charge, and achieve high economic benefits and social benefits. Benefits, small side effects of pellets, low price effect

Active Publication Date: 2015-04-22
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidized pellets mainly rely on Fe during calcination 2 o 3 The crystallization and growth of the oxidized pellets are consolidated. The pellets produced by this consolidation method have high compressive strength. 2 o 3 , during the blast furnace ironmaking process, Fe 2 o 3 →Fe 3 o 4 The transformation of →FeO→Fe produces reduction volume expansion, and the strength of the pellets after reduction is low, which makes the air permeability of the blast furnace charge worse, which in turn affects the forward movement of the blast furnace

Method used

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  • Pellet with high FeO content and preparation method of pellet
  • Pellet with high FeO content and preparation method of pellet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to mass percentage, 93% of iron ore concentrate powder, 0% of internal coal powder and 2% of bentonite are mixed and evenly mixed, and balls are formed in the pelletizing disc to obtain wet balls. The diameter of the wet ball is 11-16mm. The strength is 7~12N / piece.

[0038] Add the rolled coal powder and bentonite into the pelletizing disc, the mass percentage of the rolled coal powder wrapped on the surface of the wet ball is 5%, and the bentonite accounts for 5% of the mass percentage of the rolled coal powder to obtain green pellets with a diameter of 12- 18mm, the green ball strength is 12-22N / piece.

[0039] The green balls were dried at 120°C for 4 hours to obtain dry balls.

[0040] The dry pellets were calcined at 1200°C, and high FeO pellets were obtained after 4 minutes of calcining.

[0041] The mass percent content of FeO in the obtained high-FeO pellets is 21%, the mass percent content of TFe is 59%, the mass percent content of metal Fe is 0.27...

Embodiment 2

[0043] According to mass percentage, 92% of iron ore concentrate powder, 1% of internal coal powder and 2% of bentonite are mixed evenly and formed into balls in the pelletizing disc to obtain wet balls. The diameter of the wet ball is 11-16mm. The strength is 7~12N / piece.

[0044] Add the rolled coal powder and bentonite into the pelletizing disc, the mass percentage of the rolled coal powder wrapped on the surface of the wet ball is 0%, and the bentonite accounts for 7% of the mass percentage of the rolled coal powder to obtain green pellets with a diameter of 12- 18mm, the green ball strength is 12-22N / piece.

[0045] The raw balls were dried at 100°C for 5 hours to obtain dry balls.

[0046] The dry pellets were roasted at 1150°C, and high FeO pellets were obtained after roasting for 6 minutes.

[0047] The mass percent content of FeO in the obtained high FeO pellets is 45%, the mass percent content of TFe is 60%, the mass percent content of metal Fe is 0.53%, CaO and Si...

Embodiment 3

[0049] According to the mass percentage, 91% of iron ore concentrate powder, 2% of internal coal powder and 3% of bentonite are mixed and evenly mixed, and formed into balls in the pelletizing plate to obtain wet balls. The diameter of the wet ball is 11-16mm. The strength is 7~12N / piece.

[0050] Add the rolled coal powder and bentonite into the pelletizing disk, the mass percentage of the rolled coal powder wrapped on the surface of the wet ball is 5.5%, and the bentonite accounts for 8% of the mass percentage of the rolled coal powder to obtain green pellets with a diameter of 12- 18mm, the green ball strength is 12-22N / piece.

[0051] Dry the green balls at a temperature of 110°C for 4 hours to obtain dry balls.

[0052] Dry pellets were calcined at 1200°C, and high FeO pellets were obtained after 7 minutes of calcining.

[0053] The mass percentage content of FeO in the obtained high FeO pellets is 48%, the mass percentage content of TFe is 61%, the metal Fe mass percen...

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Abstract

The invention discloses a pellet with high FeO content. The pellet comprises the following components in percentage by mass: 59-61% of TFe, 21-48% of FeO, 0.27-0.8% of metal Fe, 3.8-4.5% of CaO and 4.3-5.4% of SiO2. The pellet is prepared by the following components in percentage by mass: 91-93% of iron ore concentrate powder, 0-2.0% of inner-coal blending powder, 2-3% of bentonite, and 0-5.5% of outer-rolling coal powder containing 5%-8% of bentonite. The invention further discloses a preparation method of the pellet with high FeO content. The pellet with high FeO content is free from Fe2O3, so that abnormal crystal cracking in the reduction process of transforming Fe2O3 into Fe3O4 is avoided, and the strength is high after the reduction.

Description

technical field [0001] The invention relates to the field of manufacturing blast furnace charge, in particular to a high-FeO pellet and a preparation method thereof. Background technique [0002] At present, belt roasters or grate-rotary kiln processes are used at home and abroad to produce oxidized pellets, that is, during the roasting process, the Fe in the pellets should be as much as possible 3 o 4 and FeO oxidation to form Fe 2 o 3 Therefore, the content of FeO in the pellets produced by this method is relatively low, and the mass percentage of FeO is generally 0.5-1.5%. Oxidized pellets mainly rely on Fe during calcination 2 o 3 The crystallization and growth of the oxidized pellets are consolidated. The pellets produced by this consolidation method have high compressive strength. 2 o 3 , during the blast furnace ironmaking process, Fe 2 o 3 → Fe 3 o 4 The transformation of →FeO→Fe produces reduction volume expansion, and the strength of pellets after reduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24
Inventor 李玉柱邬虎林白晓光刘周利吕志义付国伟陈革张永王雅军孙睿寇沙沙高志国
Owner INNER MONGOLIA BAOTOU STEEL UNION
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