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Blast furnace material distribution adjusting method by reasonably using multi-grade sintered ore

An adjustment method and technology of sintering ore, applied in the field of ironmaking, can solve problems such as changes in particle size composition, production impact, and reduction of sintering ore pulverization rate

Active Publication Date: 2019-10-15
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

This method is to pretreat the sintered ore that has not been put into the furnace by spraying water passivation agent to reduce the pulverization rate of the sintered ore in the low-temperature reduction zone of the blast furnace. This method will increase the processing cost, and the use of halides will make the equipment Corrosion, which affects production
[0005] At present, there are related technologies to adjust the particle size of the incoming raw material to solve the above problems, but usually only consider the influence of the composition of the initial incoming raw material particle size on the blast furnace, and use this as a basis to guide the blast furnace charge distribution, and do not fully consider the drop of the charge in the blast furnace and During the reduction process, the particle size composition will change significantly, and its impact and effect need to be re-evaluated
[0006] At present, there is no relevant technology to improve the blast furnace smelting process and reduce consumption by using the particle size change after reduction of sinter. Proposing a reasonable sinter blast furnace distribution technology is important for increasing the blast furnace's adaptability to raw materials and reducing blast furnace fuel consumption. significance

Method used

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Effect test

Embodiment 1

[0077] This embodiment provides a blast furnace material distribution adjustment method for reasonably using multi-grain sintered ore. The process is shown in the attached figure 1 shown, including the following steps:

[0078] (1) Preparation of test samples for reducing pulverization performance of sinters with different particle sizes. ①. Take 10kg of sinter from the blast furnace sinter tank; ②. Sieve the sinter according to 3.5~5mm, 5~10mm, 10~25mm, >25mm, and calculate the percentage of each particle size as: L 3.5～5 , L 5-10 , L 10-25 , L ＞25 ; ③. Take 2 samples of 500g for each particle size, respectively for the low-temperature reduction pulverization test and high-temperature reflow performance test at 500 ° C (standard). The reason for testing 3.5-5mm, 5-10mm, 10-25mm, and >25mm is that 3.5-5mm and 5-10mm are the main particle sizes that affect the air permeability of blast furnaces during the research process; 10-25mm and >25mm are in the The proportion of sin...

Embodiment 2

[0102] This embodiment adopts the blast furnace material distribution adjustment method of rationally using multi-grained sinter as shown in Example 1, and the 7# blast furnace of Wuhan Iron and Steel Co., Ltd. (3200m 3 ) to adjust the cloth, the details are as follows:

[0103] In June 2018, Wuhan Iron and Steel Co., Ltd. 7# blast furnace (3200m 3 ) The pulverization rate index of the reference sample of the sintered ore using the new ore blending structure was normal in the early stage, but then it showed an upward trend, the blast furnace air volume decreased, and the smelting efficiency decreased.

[0104] In view of the above situation, the production sample was taken to test its full particle size according to step (1) to step (8) shown in embodiment 1, and the sample pulverization after the sintered ore benchmark sample and production change in the blast furnace were obtained. situation and obtained the corresponding cumulative comprehensive values ​​of A, C, M, S, J, ...

Embodiment 3

[0116] This embodiment adopts the blast furnace material distribution adjustment method of rationally using multi-grained sinter as shown in Example 1, and is used for Wuhan Iron and Steel Co., Ltd. 3 ) to adjust the cloth, the details are as follows:

[0117] In September 2018, Wuhan Iron and Steel Co., Ltd. 1# blast furnace (4117m 3 ) The pulverization rate index of the reference sample of the sintered ore using the new ore blending structure is normal in the early stage, and then it shows a downward trend. The air volume of the blast furnace has room to increase, and the smelting efficiency can be improved.

[0118] In view of the above situation, the production sample was taken to test its full particle size according to step (1) to step (8) shown in embodiment 1, and the sample pulverization after the sintered ore benchmark sample and production change in the blast furnace were obtained. situation and obtained the corresponding cumulative comprehensive values ​​of A, C, ...

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Abstract

The invention discloses a blast furnace material distribution adjusting method by reasonably using multi-grade sintered ore. The method comprises the steps of sieving standard ore according to particle sizes of 3.5-5 mm, 5-10 mm, 10-25 mm and greater than 25 mm to obtain standard samples with different particle size grades, and obtaining the change amount of each particle grade before and after reductive pulverization test of the standard samples and recording B0 as smaller than 3.5, 3.5-5, 5-10, 10-25 and greater than 25; and in the same way, obtaining the change amount of each particle gradebefore and after the reductive pulverization test of the evaluation samples and recording B1 as smaller than 3.5, 3.5-5, 5-10, 10-25 and greater than 25. By evaluating the reduction and pulverizationperformance of the sintered ore with different grain sizes and the change rule of each grain size after pulverization, a reasonable adjusting method of sintered ore distribution in blast furnace is provided, the blast furnace smelting process can be obviously improved, and the consumption can be reduced; and the method is easy to implement and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and relates to a blast furnace material distribution adjustment method for rationally using multi-grain sintered ore. Background technique [0002] As the most important iron-containing raw material of blast furnace, sintered ore undergoes different degrees of reduction and pulverization of each particle size during the process of heating up the furnace, and the composition ratio of each particle size after pulverization will directly affect the upper solid material layer of the blast furnace The air permeability of the blast furnace makes it difficult to control the gas flow in the blast furnace, the gas utilization rate decreases, the smelting efficiency decreases, and even the lower furnace wall of the blast furnace is easily bonded and the blast furnace fluctuates frequently. How to increase the adaptability of the blast furnace to raw materials and how to solve the problems that are not c...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/008
Inventor 肖志新董汉东王齐武陈令坤郑华伟鲁婷
Owner 武汉钢铁有限公司