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Sintering method using CDQ powder for sintering

A sintering method and technology for mixing powder, applied in the field of sintering using CDQ powder, can solve the problems of fluctuation in the sintering process, easy to be drawn into the large flue, and increased fuel consumption of sintered solids, so as to stabilize the sintering process and improve the system The effect of the particle effect

Active Publication Date: 2020-12-25
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] CDQ powder is the dedusting ash in the CDQ environment of coking plants. It is a waste produced under the requirements of environmental protection, energy saving and clean production in the coking industry. A large amount of CDQ powder will be produced in the CDQ production process, which is mainly divided into two types. The first CDQ dedusting coke powder produced by coke dry quenching and dedusting equipment, and the second type is dedusting coke powder produced by dedusting equipment in the coke warehouse in front of the furnace and coke cutter room. In order to ensure no pollution to the environment and reduce waste of resources, it has a high Fixed carbon and calorific value. At present, part of it is used in blast furnace instead of blast furnace injection coal, and part of it is used instead of fuel for sintering production to directly participate in batching. Due to the fine particle size of CDQ powder and short combustion flame, incomplete combustion occurs during sintering. Furthermore, the uniformity of the direct dosing amount is poor, resulting in sinter FeO fluctuations, which cannot ensure the heat balance and stability of the sintering process, resulting in fluctuations in the sintering process, affecting the strength, particle size, yield and output of the sintered ore. Large flue, lower utilization rate, sintered solid fuel consumption will inevitably increase
It can be seen that the consumption of CDQ powder in sintering production directly causes severe fluctuations in the sintering process, and inevitably there will be negative effects such as fluctuations in sinter composition and decrease in sinter strength
Another way is to mix miscellaneous ore into a large mixing pile to weaken the impact of CDQ powder on sintering production, but at the same time it will increase the processing fee of miscellaneous ore and affect the cost

Method used

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  • Sintering method using CDQ powder for sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In Example 1, it was determined that the central value of the basicity of sintered ore was 1.90 times, and CD Q powder pellets were laid on the belt behind the primary mixer, and the output was controlled to be 6t per hour.

[0033] Specifically, by weight percentage, the composition of the mixture is as follows: 59.8% of mixed powder, 25% of returned ore, 3.7% of coal powder, 4% of limestone, 4.5% of dolomite, and 3.0% of granular ash.

[0034] Specifically, by weight percentage, the composition of the mixed powder is as follows: Ka powder 23%, A powder 10%, Yangdi powder 46%, Sic concentrate 4%, super special powder 5%, Lake powder 4%, Iron dust mud 2%, new powder 4%, plum essence 2%.

[0035] By adopting the above-mentioned technical scheme, a mixed iron powder whose chemical composition meets the requirements is obtained, the planned value of TFe is 60.37%, and SiO 2 Planned value 4.84%, trace element control: Al 2 o 3 The planned value is 1.53%, the Mn planned v...

Embodiment 2

[0038] In Example 2, it is determined that the central value of the basicity of the sintered ore is 1.85 times, and CD Q powder pellets are laid on the belt behind the primary mixer, and the output is controlled to be 8t per hour.

[0039] In percent by weight, the compound composition is as follows: mixing powder (60)%, returning ore (25)%, coal dust (3.8)%, limestone (4)%, dolomite (4.2)%, granular ash ( 3.0)%.

[0040] In percent by weight, the mixed powder is composed as follows: Ka powder (23)%, A powder (10)%, Yangdi powder (46)%, Sic concentrate (4)%, super special powder (5)% , Lake Powder (4)%, Iron Dust Slime (2)%, Newborn Powder (4)%, Plum Essence (2)%.

[0041] By adopting the above-mentioned technical scheme, a mixed iron powder whose chemical composition meets the requirements is obtained, the planned value of TFe is 60.37%, and SiO 2 Planned value 4.84%, trace element control: Al 2 o 3 The planned value is 1.53%, the Mn planned value is 0.106%, the S planned v...

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Abstract

The invention discloses a sintering method using CDQ powder for sintering, and belongs to the technical field of sintering pellets in the metallurgical industry. The sintering method using the CDQ powder for sintering comprises the following steps that CDQ powder, return mine and a binder are proportioned according to a ratio of 1:2:(0.3 to 0.5), fed into a strong mixer for uniform material mixing, and fed into a disc pelletizer, pelletizing is carried out by taking return mine particles as cores, pelletized pellets are conveyed into a mixture belt behind a primary mixer in sintering production, conveyed into a secondary mixer for mixing and pelletizing, and then conveyed into a sintering machine for distributing, igniting and sintering, the CDQ powder is directly solidified on the returnmine particles through the binder, and the CDQ powder is wrapped with other materials in the pelletizing process of the secondary mixer. The pelletizing effect of a sintered mixture is improved, and the adverse effect that the CDQ powder is directly proportioned and participates in sintering production is overcome.

Description

technical field [0001] The invention relates to the technical field of sintered pellets in the metallurgical industry, in particular to a sintering method using CDQ powder for sintering. Background technique [0002] CDQ powder is the dedusting ash in the CDQ environment of coking plants. It is a waste produced under the requirements of environmental protection, energy saving and clean production in the coking industry. A large amount of CDQ powder will be produced in the CDQ production process, which is mainly divided into two types. The first CDQ dedusting coke powder produced by coke dry quenching and dedusting equipment, and the second type is dedusting coke powder produced by dedusting equipment in the coke warehouse in front of the furnace and coke cutter room. In order to ensure no pollution to the environment and reduce waste of resources, it has a high Fixed carbon and calorific value. At present, part of it is used in blast furnace instead of blast furnace injectio...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/245
CPCC22B1/16C22B1/245
Inventor 李井成蒋国波孙庆星范维国罗之礼
Owner 武汉钢铁有限公司