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A 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 the strength of the sintered ore is reduced, so as to stabilize the sintering process and improve the granulation. effect of effect

Active Publication Date: 2022-08-02
武汉钢铁有限公司
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  • Summary
  • 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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  • A sintering method using cdq powder for sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0033] Specifically, by weight percentage, the mixture is composed 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, in terms of percentage by weight, the mixed powder is composed as follows: 23% card powder, 10% A powder, 46% Yangdi powder, 4% Sic concentrate, 5% ultra-special powder, 4% Leike powder, Iron dust mud 2%, New Zealand powder 4%, plum essence 2%.

[0035] By adopting the above technical solutions, the mixed iron powder with the required chemical composition is obtained, the planned TFe value is 60.37%, the SiO 2 Planned value 4.84%, trace element control: Al 2 O 3 The planned value is 1.53%, the planned value of Mn is 0.106%, the planned...

Embodiment 2

[0038] In Example 2, the central value of basicity of sintered ore was determined to be 1.85 times, and CD Q powder pellets were spread on the belt after the primary mixer, and the output was controlled to 8t per hour.

[0039] By weight percentage, the composition of the mixture is as follows: mixed powder (60)%, returned ore (25)%, coal powder (3.8)%, limestone (4)%, dolomite (4.2)%, granular ash ( 3.0)%.

[0040] By weight percentage, the composition of the mixed powder is as follows: card powder (23)%, A powder (10)%, Yangdi powder (46)%, Sic concentrate (4)%, ultra-special powder (5)% , Lake powder (4)%, iron dust mud (2)%, new powder (4)%, plum essence (2)%.

[0041] By adopting the above technical solutions, the mixed iron powder with the required chemical composition is obtained, the planned TFe value is 60.37%, the SiO 2 Planned value 4.84%, trace element control: Al 2 O 3 The planned value is 1.53%, the planned value of Mn is 0.106%, the planned value of S is 0.016...

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Abstract

The invention discloses a sintering method using CDQ powder for sintering, belonging to the technical field of sintering pellets in the metallurgical industry. ~ 0.5 proportion of ingredients, and sent to a strong mixer for material mixing, and then sent to a disc pelletizer to make pellets with the returned ore particles as the core, and the pellets were sent to the sintering production after the primary mixer. On the mixing belt, it is sent to the secondary mixer for mixing and granulation, and then sent to the sintering machine for distribution, ignition and sintering, and the CDQ powder is directly consolidated on the returned ore particles through the binder. It is wrapped by other materials, which improves the granulation effect of the sintering mixture and overcomes the adverse effects of the direct ingredients of CDQ powder participating in the sintering production.

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 coking plant CDQ environmental dust, which is the waste produced under the requirements of environmental protection, energy saving and clean production in the coking industry. The CDQ production process will produce a large amount of CDQ powder, which is mainly divided into two types, the first one. The CDQ dust-removing coke powder produced by the coke quenching and dust-removing equipment, and the second is the dust-removing coke powder produced by the dust-removing equipment in the coke warehouse in front of the furnace and the coke cutting machine room. Fixed carbon and calorific value. At present, some of them are used in blast furnaces instead of blast furnace injection coal, and some are used as substitute fuels for sintering production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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