Light-weight and heat-isolation mullite bricks and preparation method thereof

A light heat insulation and mullite technology, applied in ceramic products, other household utensils, applications, etc., can solve the problems of low compressive strength and volume density, high thermal conductivity of products, and large line change rate after firing, etc., to achieve Low linear shrinkage, good thermal stability, and low bulk density

Active Publication Date: 2017-05-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the manufactured product has high compressive strength, its defects are: complex preparation process, high thermal conductivity of the product, and high linear shrinkage
[0004] "A clay lightweight brick and its preparation method" (CN103435332A) patented technology, the patented technology uses 30~40wt% kyanite or coke gem, 35~45wt% fly ash and 15~35wt% plastic clay As a raw material, add 35~55wt% pore forming agent or 2~4wt% polystyrene balls of the raw material, and add 6~10wt% binder of the raw mate

Method used

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Examples

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preparation example Construction

[0029] The preparation method of the described pore-forming agent is: according to sawdust: the mass ratio of silica sol is (1.5~2): 1, adds silica sol to sawdust, stirs evenly, at 10 3 ~10 4 Immerse 5~10min under Pa condition, dry, obtain modified sawdust; Then described primary modified sawdust is ball-milled 3~5h, after ball milling, modified sawdust is at 10 3 ~10 4Pa stand for 2 to 3 minutes, and dry to obtain a pore-forming agent.

[0030] The main chemical composition of the kyanite is: SiO 2 35~40wt%, Al 2 o 3 55~60wt%, ZrO 2 1~2wt%, Fe 2 o 3 0.5~0.9wt%, CaO+MgO 0.5~0.8wt%, loss on ignition 0.1~0.25wt%; the particle size of kyanite is less than 0.088mm.

[0031] The main chemical composition of the burnt gem is: Al 2 o 3 45~50wt%, SiO 2 40~50wt%, Fe 2 o 3 0.5~1wt%, CaO 0.5~0.6wt%, MgO 0.2~0.3wt%, Na 2 O is 0.5~1.0wt%, K 2 O is 0.1-0.2wt%, loss on ignition is 1-1.5wt%; the particle size of the burnt gem is less than 0.088mm.

[0032] The α-Al 2 o 3 The...

Embodiment 1

[0037] A mullite lightweight heat-insulating brick and a preparation method thereof. The raw materials and contents of the mullite lightweight heat-insulating bricks are: 40-44wt% of coke gem, 33-38wt% of kyanite, 6-12wt% of clay, α-Al 2 o 3 The micro powder is 14-20wt%; the binder is 19-20wt% of the raw material, and the pore-forming agent is 45-48wt% of the raw material.

[0038] The preparation method of the mullite lightweight heat-insulating brick is: according to the content of the above-mentioned raw materials, binder and pore-forming agent, the α-Al 2 o 3 Mix micropowder with pore-forming agent, wet mill for 8-10 hours to obtain homogeneous mud, then stir the homogeneous mud, burnt gemstone, kyanite, clay and binder at room temperature for 6-10 hours, trap materials, and form , baked at 110°C for 24 hours, and kept at 1325-1350°C for 3-5 hours to obtain mullite lightweight heat-insulating bricks.

[0039] In this embodiment: the clay is Suzhou soil; the binder is p...

Embodiment 2

[0042] A mullite lightweight heat-insulating brick and a preparation method thereof. The raw materials and contents of the mullite lightweight heat-insulating bricks are: 41~45wt% of coke gemstone, 28~33wt% of kyanite, 7~13wt% of clay, α-Al 2 o 3 The micro powder is 15-21wt%; the binder is 18-19wt% of the raw material, and the pore-forming agent is 48-51wt% of the raw material.

[0043] The preparation method of the mullite lightweight heat-insulating brick is: according to the content of the above-mentioned raw materials, binder and pore-forming agent, the α-Al 2 o 3 Mix micropowder with pore-forming agent, wet mill for 8-10 hours to obtain homogeneous mud, then stir the homogeneous mud, burnt gemstone, kyanite, clay and binder at room temperature for 6-10 hours, trap materials, and form , baked at 110°C for 24 hours, and kept at 1350-1375°C for 3-5 hours to obtain mullite lightweight heat-insulating bricks.

[0044] In this embodiment: the clay is kaolin; the binder is a...

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Abstract

The invention particularly relates to light-weight and heat-isolation mullite bricks and a preparation method thereof. The technical scheme is that the light-weight and heat-isolation mullite bricks are prepared from the following raw materials in percentage by weight: 40 to 48 percent of flint clay, 14 to 38 percent of kyanite, 6 to 16 percent of clay and 14 to 24 percent of alpha-Al2O3 fine powder, wherein a bonding agent is 15 to 20 percent by weight of the raw materials, and a pore-forming agent is 45 to 60 percent by weight of the raw materials. The preparation method comprises the following steps of firstly mixing the alpha-Al2O3 fine powder with the pore-forming agent, and carrying out wet grinding for 8 to 10 hours to obtain homogenized mud; uniformly stirring the homogenized mud, the flint clay, the kyanite, the clay and the bonding agent; carrying out aging, forming and baking; and preserving the heat at 1,325 to 1,450 DEG C for 3 to 5 hours to obtain the light-weight and heat-isolation mullite bricks. The light-weight and heat-isolation mullite bricks and the preparation method thereof have the advantages of saving resources, being simple in process, and being environmentally-friendly; and the prepared light-weight and heat-isolation mullite bricks are high in heat stability, low in heat conduction coefficient, low in volume density, low in after-burning linear shrinkage ratio, high in compression strength and good in heat insulation and isolation effect.

Description

technical field [0001] The invention belongs to the technical field of lightweight heat insulating bricks. It specifically relates to a mullite lightweight heat-insulating brick and a preparation method thereof. Background technique [0002] At present, affected by the lack of energy at home and abroad and the price of available energy, the development of new energy-saving refractory materials has a huge market demand at home and abroad. The research and development of environmentally friendly heat-insulating refractory materials and the preparation of low-density, low thermal conductivity, high-strength, and low-cost lightweight heat-insulating materials have become the mainstream direction. [0003] "A high-silicon mullite with the structure of gramineous plants and its preparation method" (CN201410457026.9) patent technology, using 30~90wt% aluminum sol as impregnating agent in normal pressure or 10 3 ~10 4 Soaking under Pa conditions, stirring evenly; then baking the ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/185C04B38/06
CPCC04B35/185C04B35/66C04B38/0675C04B2235/3217C04B2235/3418C04B2235/3427C04B2235/3463C04B2235/349C04B2235/77C04B2235/96C04B2235/9607C04B2235/9615C04B38/0067
Inventor 李远兵刘建博李淑静向若飞徐娜娜欧阳思
Owner WUHAN UNIV OF SCI & TECH
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