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Low-thermal-conductivity light-weight silica brick and preparation method thereof

A lightweight, low thermal conductivity technology, applied in the field of low thermal conductivity lightweight silica bricks and its preparation, can solve the problems of reduced life, low thermal conductivity of silica bricks, intergranular stress corrosion of steel shells, etc., to improve life, porosity The effect of moderate rate and lower steel shell temperature

Active Publication Date: 2021-11-30
郑州东豫新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the upper part of the regenerator of the top-fired hot blast stove and the lining of the cone section are generally made of silica bricks with the same performance as the silica checker bricks used in the regenerator. From the perspective of performance, the silica checker bricks inside the regenerator As a heat storage carrier, the greater the density, the higher the thermal conductivity, the stronger the heat transfer capacity, the better the performance; research shows that the thermal conductivity of silica bricks can reach 2.35-2.45w / mk, and the overall thermal conductivity can be increased by more than 20%. , if the silicon lining of the working layer also follows this design idea, then the same thickness of the lining will inevitably lead to an increase in the temperature of the furnace steel shell, especially the temperature of the vault, and the high temperature will inevitably cause intergranular stress corrosion of the steel shell, causing cracking Bad consequences such as welding reduce its life
Based on the above analysis process, it is not difficult to draw the conclusion that silica bricks used as furnace lining materials should have low thermal conductivity, which is completely different from the design idea that silica bricks used as regenerators should have high thermal conductivity

Method used

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  • Low-thermal-conductivity light-weight silica brick and preparation method thereof

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Effect test

Embodiment 1

[0020] A low thermal conductivity lightweight silica brick, selected from the following components in mass fraction: 65% of crystalline silica sand, 15% of waste brick cooked silica sand, 20% of crystalline silica Powder, plus 2.2% micron calcium carbonate powder, plus 0.6% iron scale powder, plus 0.5% bentonite, plus 1.2% fluorite powder. Wherein the crystalline silica sand particle size is less than or equal to 2.2mm and SiO 2 The content is not less than 98.5%, and the grain size of the waste brick cooked silica sand is less than or equal to 2.5mm and SiO 2 content of not less than 94.5%, the particle size of the crystalline silica powder is less than or equal to 0.074mm, the particle size of the micron calcium carbonate powder is less than or equal to 5 microns and the mass content is not less than 95%, the particle size of the iron scale powder is less than or equal to 0.088mm and Fe 2 o 3 The mass content is not less than 90%, the particle size of the fluorite powder i...

Embodiment 2

[0023] A low thermal conductivity lightweight silica brick, selected from the following components in mass fraction: including the following components in mass fraction: 65% crystalline silica sand, 18% waste brick cooked silica sand, 17% crystalline silica Powder, plus 2.6% micron calcium carbonate powder, plus 0.6% iron scale powder, plus 0.5% bentonite, plus 1.2% fluorite powder. Wherein the crystalline silica sand particle size is less than or equal to 2.2mm and SiO 2 The content is not less than 98.5%, and the grain size of the waste brick cooked silica sand is less than or equal to 2.5mm and SiO 2 content of not less than 94.5%, the particle size of the crystalline silica powder is less than or equal to 0.074mm, the particle size of the micron calcium carbonate powder is less than or equal to 5 microns and the mass content is not less than 95%, the particle size of the iron scale powder is less than or equal to 0.088mm and Fe 2 o 3 The mass content is not less than 90%...

Embodiment 3

[0026] A low thermal conductivity lightweight silica brick, selected from the following components in mass fraction: including the following components in mass fraction: 65% crystalline silica sand, 20% waste brick cooked silica sand, 15% crystalline silica Powder, plus 3% micron calcium carbonate powder, plus 0.6% iron scale powder, plus 0.5% bentonite, plus 1.2% fluorite powder. Wherein the crystalline silica sand particle size is less than or equal to 2.2mm and SiO 2 The content is not less than 98.5%, and the grain size of the waste brick cooked silica sand is less than or equal to 2.5mm and SiO 2 content of not less than 94.5%, the particle size of the crystalline silica powder is less than or equal to 0.074mm, the particle size of the micron calcium carbonate powder is less than or equal to 5 microns and the mass content is not less than 95%, the particle size of the iron scale powder is less than or equal to 0.088mm and Fe 2 o 3 The mass content is not less than 90%, ...

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Abstract

The invention relates to a low-thermal-conductivity light-weight silica brick and a preparation method thereof. The silica brick can be prepared from the following components in percentage by mass: 60%-65% of crystalline silicon sand, 15%-20% of cooked silica sand, 15%-25% of crystalline silicon stone powder, 1.5%-3.5% of micron calcium carbonate powder, 1%-2% of a mineralizer and 1%-2.5% of a binder. By mixing and blending the materials and controlling the temperature in the sintering process, a light-weight silica brick product with moderate porosity and low thermal conductivity is prepared. The temperature of a steel shell of a furnace body is reduced, the service life of the steel shell is prolonged, and the silica brick is environment-friendly.

Description

technical field [0001] The invention relates to the technical field of silica brick preparation, in particular to a low-thermal conductivity lightweight silica brick and a preparation method thereof. Background technique [0002] At present, the upper part of the regenerator of the top-fired hot blast stove and the lining of the cone section are generally made of silica bricks with the same performance as the silica checker bricks used in the regenerator. From the perspective of performance, the silica checker bricks inside the regenerator As a heat storage carrier, the greater the density, the higher the thermal conductivity, the stronger the heat transfer capacity, the better the performance; research shows that the thermal conductivity of silica bricks can reach 2.35-2.45w / mk, and the overall thermal conductivity can be increased by more than 20%. , if the silicon lining of the working layer also follows this design idea, then the same thickness of the lining will inevita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/636C04B38/02
CPCC04B35/14C04B38/02C04B35/636C04B2235/3208C04B2235/3272C04B2235/445C04B2235/349C04B2235/9607C04B2201/50C04B2235/77C04B38/0074C04B38/0067
Inventor 董红芹樊效乐李建涛
Owner 郑州东豫新材料科技有限公司