Coal-injection duct prefabricated brick and production method thereof

A technology of prefabricated bricks and coal injection pipes, which is applied in the field of prefabricated bricks and production of coal injection pipes, can solve the problems of short service life, easy cracking and easy peeling of coal injection pipes, etc. Good shock stability

Inactive Publication Date: 2014-12-17
长兴鑫鼎耐火材料厂(普通合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing coal injection pipe is easy to crack, easy to peel off, and has a short service life, so as to provide a prefabricated brick for coal injection pipe and a production method that can improve wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The prefabricated brick for coal injection pipe is composed of the following components by weight percentage: white corundum 54.96%, mullite 11.07%, corundum fine powder 10.82%, fused spinel 5.57%, silicon carbide 5.62%, lactic acid glue 6.17%, Leveling agent 5.79%.

Embodiment 2

[0019] The prefabricated brick for coal injection pipe is composed of the following components by weight percentage: white corundum 60%, mullite 10%, corundum fine powder 10%, fused spinel 5%, silicon carbide 5%, lactic acid glue 5.5%, Leveling agent 4.5%.

Embodiment 3

[0021] The prefabricated brick for coal injection pipe is composed of the following components by weight percentage: white corundum 63.44%, mullite 8.71%, corundum fine powder 9.11%, fused spinel 4.72%, silicon carbide 4.43%, lactic acid glue 4.76%, Leveling agent 4.83%.

[0022] The production method adopted for the above-mentioned coal injection pipe prefabricated bricks sequentially includes the following steps:

[0023] a) Mixing of raw materials: add lactic acid glue and leveling agent to white corundum, mullite, fine corundum powder, fused spinel, and silicon carbide, and then mix them uniformly to form a castable;

[0024] b) Pouring molding: Put the mixed castable in step a) into a molding mold and form it by stirring and vibration;

[0025] c) Demoulding: demoulding the prefabricated bricks formed in step b), and pre-curing the prefabricated bricks before demolding, and the curing time is 12-24h;

[0026] d) Baking: the prefabricated bricks processed in step c) are baked at hi...

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Abstract

The invention relates to a coal-injection duct prefabricated brick which is composed of the following components: white corundum, mullite, fine corundum powder, electrically-fused spinel, silicon carbide, lactic acid glue and a flatting agent. A production method of the coal-injection duct prefabricated brick sequentially comprises the following steps of mixing of raw materials; moulding by casting; demoulding; roasting; heat treatment, and inspection for warehousing. The prepared coal-injection duct prefabricated brick has the advantages of good thermal shock stability and good overall high-temperature resistance and corrosion resistance, so that the anti-stripping performance, the abrasion resistance and the oxidation resistance of a coal-injection duct are improved, i.e., the running time of the coal-injection duct is prolonged; the content of Al2O3 in the prefabricated brick is greater than or equal to 75%; the content of SiO2 in the prefabricated brick is less than or equal to 20%; the usage temperature of the prefabricated brick can reach up to 1650 DEG C; the overall volume density of the prefabricated brick is greater than or equal to 2.75g / cm<3>; the highest compression strength of the prefabricated brick can reach 130MPa; the highest rupture strength of the prefabricated brick is 12MPa; the linear change rate of the prefabricated brick at 1100 DEG C is equal to + / -0.3, and the linear change rate of the prefabricated brick at 1500 DEG C is equal to + / -0.5.

Description

Technical field [0001] The invention relates to a coal injection pipe prefabricated brick and a production method. Background technique [0002] In the past, the castable for coal injection pipe was made of special castable for coal injection pipe, which was cast on site. In particular, the head of the injection pipe has high temperature, easy to crack and peel off. Especially in this part, the working environment of refractory materials is even worse. The coal injection pipe not only withstands considerable high temperature, some will be severely corroded, but also a large amount of fine-grained clinker high-speed tertiary air flow is scoured, so the environment is particularly harsh, the castable is seriously damaged, and it often affects production. The refractories used in coal pipes are roughly divided into high-alumina castables and mullite corundum castables. The use of the former is only about 1 to 2 months, and the use time of mullite corundum castables can only last for...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
Inventor 丁志祥
Owner 长兴鑫鼎耐火材料厂(普通合伙)
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