Self-flow type large-area batching mix for revolving furnace and methods for preparing and using self-flow type large-area mix

A repair material and converter technology, applied in the field of refractory materials, can solve the problems of poor resistance to molten steel erosion and steel slag erosion, affecting material fluidity, material compactness, and poor high-temperature sintering performance, and achieves low production costs and excellent preparation methods. Practical, the effect of improving the erosion resistance of molten steel

Inactive Publication Date: 2012-12-05
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of large-surface repair material has the following disadvantages: 1) Using high-grade magnesia such as sintered magnesia and fused magnesia as the main raw material, the cost is high and the cost performance is poor; 2) The use of sintered magnesia, fused magnesia, etc. The high-grade magnesia as the main raw material of the large surface repair material has poor high-temperature sintering performance, low high-temperature strength, poor resistance to molten steel erosion and steel slag erosion, so the service life generally does not exceed 50h; Segregation and stratification occurs, which affects the fluidity of the material and the compactness of the repaired material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this example, the parts by weight of the components of the self-flowing large surface repair material for converters are as follows: 70 aggregates, 20 fine powders, 5 micropowders, 5 binders, 5 burning accelerators, 0.2 explosion-proof agents, and 2 thickeners .

[0031] The aggregates include: 3mm2 Micropowder and active α-Al 2 o 3 Mixture of micropowders, where SiO 2 Micropowder, SiO 2 Content≥92%, particle size≤45μm, α-Al 2 o 3 In micropowder, α-Al 2 o 3 Content ≥ 99%, particle size ≤ 2μm. The binding agent is sodium hexametaphosphate. The sintering accelerator is a mixture of synthetic magnesia-calcium-iron sand and forsterite, among which, the content of MgO in the synthetic magnesia-calcium-iron sand is 65-74%, the content of CaO: 20-23%, and the content of Fe 2 o 3Content: 3~8%, MgO content of forsterite ≥40%, SiO 2 Content ≤ 42%. The explosion-proof agent is polypropylene fiber. The thickener is a mixture of dextrin and sodium carboxymethylcellul...

Embodiment 2

[0034] In this example, the parts by weight of the components of the self-flowing large surface repair material for converters are as follows: 60 aggregates, 22 fine powders, 15 fine powders, 3 binders, 7 burning accelerators, 0.3 explosion-proof agents, and 3 thickeners .

[0035] The aggregates include: 0.088mm2 Micropowder and active α-Al 2 o 3 Mixture of micropowders, where SiO 2 Micropowder, SiO 2 Content≥92%, particle size≤45μm, α-Al 2 o 3 In micropowder, α-Al 2 o 3 Content ≥ 99%, particle size ≤ 2μm. The binding agent is sodium tripolyphosphate. The sintering accelerator is a mixture of synthetic magnesia-calcium-iron sand and forsterite, among which, the content of MgO in the synthetic magnesia-calcium-iron sand is 65-74%, the content of CaO: 20-23%, and the content of Fe 2 o 3 Content: 3~8%, MgO content of forsterite ≥40%, SiO 2 Content ≤ 42%. The explosion-proof agent is glass fiber. The thickener is a mixture of dextrin and sodium polyacrylate.

[0036...

Embodiment 3

[0038] In this example, the parts by weight of the components of the self-flowing large surface repair material for converters are as follows: 50 aggregates, 25 fine powders, 20 fine powders, 5 binders, 5 burning accelerators, 0.5 explosion-proof agents, and 1 thickener .

[0039] The aggregates include: 3mm2 Micropowder and active α-Al 2 o 3 Mixture of micropowders, where SiO 2 Micropowder, SiO 2 Content≥92%, particle size≤45μm, α-Al 2 o 3 In micropowder, α-Al 2 o 3 Content ≥ 99%, particle size ≤ 2μm. The binding agent is sodium hexametaphosphate. The sintering accelerator is synthetic magnesia-calcium-iron sand, of which the content of MgO in the synthetic magnesia-calcium-iron sand is 65-74%, the content of CaO is 20-23%, and the content of Fe 2 o 3 Content: 3~8%. The explosion-proof agent is polypropylene fiber. The thickener is a mixture of dextrin and clay.

[0040] The performance testing results of the self-flowing large surface repair material for convert...

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Abstract

The invention discloses a self-flow type large-area batching mix for a revolving furnace and methods for preparing and using the self-flow type large-area batching mix. The batching mix consists of the following components in part by weight: 50 to 70 parts of aggregate, 20 to 30 parts of fine powder, 10 to 20 parts of micro powder, 1 to 10 parts of binding agent, 2 to 20 parts of burning promoter, 0.1 to 0.5 part of detonation inhibitor and 0.1 to 4 parts of thickening agent, and the sum of the parts of the aggregate, fine powder, micro powder and binding agent is 100; the aggregate and the fine powder are one or both of the medium-grade magnesia with the MgO content of more than or equal to 95 percent and the first-grade magnesia with the MgO content of more than or equal to 92 percent, and the grain sizes are more than 0.088mm and less than or equal to 5mm and less than or equal to 0.088mm respectively; and the micro powder is the mixture of SiO2 micro powder and active alpha-Al2O3 micro powder. The preparation method comprises the following steps of adding the aggregate, fine powder, micro powder and binding agent in a forced mixer, stirring for 5 to 8 minutes, adding the burning promoter, detonation inhibitor and thickening agent, and stirring the mixture for 3 to 5 minutes. The using method comprises the following steps of putting the batching mix in a mixer, performing dry mixing on the batching mix for 2 to 3 minutes, adding water in an amount which is 8 to 15 percent of the weight of the batching mix, uniformly stirring the mixture for 4 to 5 minutes, discharging, and adding the batching mix into the revolving furnace within one hour. The batching mix is low in cost, high in sintering property, long in service life and long in standing time.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a self-flowing large surface repair material for a converter and a preparation and use method. Background technique [0002] The furnace age of the converter is an important technical and economic index in the converter steelmaking, and it is an important factor for the steelmaking plant to exert its benefits. Increasing the furnace life of the converter can not only improve the production efficiency of the converter, reduce the consumption of refractory materials, ensure the operation rate of the continuous casting machine, but also give full play to the comprehensive benefits of the blast furnace, steelmaking, steel rolling and other systems. [0003] With the popularization and popularization of converter slag splash protection technology, the furnace life of converter can reach up to 30,000 to 40,000 furnace times. After the application of the slag s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 王志强洪学勤雷中兴田先明郑吉红徐超姚亚双谭喜阳
Owner 武钢集团有限公司
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