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A kind of preparation method of sintering mixture and its distribution method and device

A technology for sintering mixed materials and fabrics, which is applied in the field of iron-making production to achieve the effects of improving air permeability and sintering utilization coefficient

Active Publication Date: 2019-06-25
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control method does not provide real-time improvement in the segregation of the mixture for ultra-thick bed sintering

Method used

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  • A kind of preparation method of sintering mixture and its distribution method and device
  • A kind of preparation method of sintering mixture and its distribution method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The mass percentages of raw iron ore powder, coke powder, returned ore, quicklime and limestone are: iron ore powder 70%, coke powder 4%, returned ore 12%, quicklime 5%, limestone 9%, and the alkalinity of the sintering mixture is 2.0. Coke powder with a particle size of less than 3mm accounts for 75%, with an average particle size of 1.8mm; limestone with a particle size of less than 3mm accounts for 80%, with an average particle size of 1.55mm.

[0032] For wetting the returned ore water, the mass fraction of the returned ore fetched water with a particle size of less than 3mm is 4.5%, and the mass fraction of the returned ore fetched water with a particle size of 3-5mm is 3.5%; The returned ore, coke powder with a particle size of 0-3mm, and limestone with a particle size of less than 3mm were added with water accounting for 85% of the total water addition, and the filling rate of the primary mixer was 14%. After mixing for 6 minutes in the primary mixer, the primary ...

Embodiment 2

[0038] The mass percentages of raw iron ore powder, coke powder, returned ore, quicklime and limestone are: iron ore powder 74%, coke powder 3%, returned ore 10%, quicklime 5%, limestone 8%, and the alkalinity of the sintering mixture is 1.9. Coke powder with a particle size of less than 3mm accounts for 78%, with an average particle size of 1.92mm; limestone with a particle size of less than 3mm accounts for 75%, with an average particle size of 1.65mm.

[0039] For the wetting of returning ore fetching water, the mass fraction of returning ore fetching water with a particle size of less than 3mm is 5%, and the mass fraction of returned ore fetching water with a particle size of 3 to 5mm is 4%; The returned ore, coke powder with a particle size of 0-3mm, and limestone with a particle size of less than 3mm were added with water accounting for 80% of the total water addition, and the filling rate of the primary mixer was 18%. After mixing in the primary mixer for 5 minutes, the ...

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Abstract

The invention relates to a sintered mixture preparation method, a sintered mixture distribution apparatus and a sintered mixture distribution method, wherein the raw materials of the sintered mixturecomprise iron ore powder, coke powder, return ore, quicklime and limestone. The sintered mixture preparation method comprises: placing iron ore powder, quicklime, return ore with a particle size of less than 3 mm after wetting, coke powder with a particle size of less than 3 mm, limestone and water to a primary mixer, and uniformly mixing to obtain a primary mixture; and placing the primary mixture, return ore with a particle size of 3-5 mm after wetting, coke powder with a particle size of more than 3 mm, limestone with a particle size of greater than 3 mm and water to a secondary intensive mixer, and uniformly mixing to prepare the sintered mixture. The sintered mixture distribution method comprises: distributing the sintered mixture onto a sintering machine in layers through the sintered mixture distribution apparatus comprising three sets of multi-roller material distributors, wherein the particle sizes of the layers are sequentially reduced from bottom to top, the particle size ofthe first layer is more than 8 mm, the particle size of the second layer is 5-8 mm, the particle size of the third layer is 3-5 mm, and the particle size of the uppermost layer is less than 3 mm. According to the present invention, the particle size ratio of the sintered mixture is improved, the precise segregation multi-layer material distribution is achieved, and the gas permeability and the sintering utilization coefficient of the sintered mixture are improved.

Description

technical field [0001] The invention belongs to the technical field of ironmaking production, and in particular relates to a method for preparing a sintering mixture capable of improving the air permeability of a sintering layer, and a method and device for distributing it. Background technique [0002] Sinter is the main raw material for smelting molten iron in blast furnaces in my country. At present, the commonly used production equipment is belt-type draft sintering machine. Thick bed sintering is a widely used sintering technology, which has the advantages of improving sinter strength and reducing sintering fuel consumption, but the application of thick bed sintering technology also faces some difficulties. [0003] With the thickening of the sintering material layer, the airflow resistance through the material layer increases, and the sintering speed slows down, which not only increases the power consumption of the fan, but also leads to a decrease in sintering product...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/24F27D3/00
CPCC22B1/16C22B1/24F27D3/0033F27M2001/02F27M2003/04
Inventor 张辉周明顺夏铁玉刘帅翟立委刘杰徐礼兵童晓宇吴远飞
Owner ANGANG STEEL CO LTD
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