Pellet with high FeO content and preparation method of pellet

A technology of pellets and raw pellets, which is applied in the field of high-FeO pellets and its preparation, can solve the problems of impacting the smooth running of blast furnaces, low pellet strength, and poor air permeability of blast furnace charge, so as to avoid abnormal crystal cracking, Improved reduction strength and low cost effect

Active Publication Date: 2013-12-11
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

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
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Example Embodiment

[0038] Example 1

[0039] According to the mass percentage, 93% of iron concentrate powder, 0% of coal powder and 2% of bentonite are mixed and evenly mixed, and formed into balls in the pelletizing disc to obtain wet balls, the diameter of wet balls is 11-16mm, and the wet balls are The strength is 7-12N / piece.

[0040] The outer rolling coal powder and bentonite are added to the pelletizing disc, the mass percentage of the outer rolling coal powder wrapped on the surface of the wet ball is 5%, and the bentonite accounts for 5% of the outer rolling coal powder mass percentage to obtain green balls, and the diameter of the green balls is 12~ 18mm, and the green ball strength is 12-22N / piece.

[0041] The green balls were dried at a temperature of 120° C. for 4 hours to obtain dry balls.

[0042] Dry balls were roasted at 1200 °C, and high FeO pellets were obtained after roasting for 4 min.

[0043] The mass percentage content of FeO in the obtained high FeO pellets is 21%, ...

Example Embodiment

[0044] Example 2

[0045] According to the mass percentage, 92% of iron concentrate powder, 1% of coal powder and 2% of bentonite are mixed and evenly mixed, and formed into balls in the pelletizing disc to obtain wet balls. The diameter of wet balls is 11-16mm. The strength is 7-12N / piece.

[0046] Add the outer rolling coal powder and bentonite to the pelletizing disc, the mass percentage of the outer rolling coal powder wrapped on the surface of the wet ball is 0%, and the bentonite accounts for 7% of the outer rolling coal powder mass percentage to obtain green balls, and the diameter of the green balls is 12~ 18mm, and the green ball strength is 12-22N / piece.

[0047] The green balls were dried at a temperature of 100° C. for 5 h to obtain dry balls.

[0048] The dry balls were calcined at 1150 °C, and high FeO pellets were obtained after 6 min of calcination.

[0049] The mass percentage content of FeO in the obtained high FeO pellets is 45%, the mass percentage conte...

Example Embodiment

[0050] Example 3

[0051] According to the mass percentage, 91% of iron concentrate powder, 2% of coal powder and 3% of bentonite are mixed and evenly mixed, and formed into balls in the pelletizing disc to obtain wet balls, the diameter of wet balls is 11-16mm, and the wet balls are The strength is 7-12N / piece.

[0052] The outer rolling coal powder and bentonite are added to the pelletizing disc, the mass percentage of the outer rolling coal powder wrapped on the surface of the wet ball is 5.5%, and the bentonite accounts for 8% of the outer rolling coal powder mass percentage to obtain a green ball, and the green ball diameter is 12~ 18mm, and the green ball strength is 12-22N / piece.

[0053] The green balls were dried at a temperature of 110° C. for 4 hours to obtain dry balls.

[0054] Dry balls were calcined at 1200 °C, and high FeO pellets were obtained after calcination for 7 min.

[0055] The mass percentage content of FeO in the obtained high FeO pellets is 48%, t...

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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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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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