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Mullite light heat-insulation brick based on kyanite tailings and manufacturing method of brick

A technology of kyanite tailings and lightweight heat insulation, applied in clay products, other household appliances, household appliances, etc., can solve the problems of unguaranteed industrial production, unfavorable industrial production, long production cycle, etc., and achieve thermal shock Excellent stability, low production cost, resource saving effect

Inactive Publication Date: 2014-06-18
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are technologies for the reuse of kyanite tailings, such as the patented technology of "a method for preparing glass fibers from kyanite tailings" (CN103193382A), which discloses a method for preparing glass fibers using kyanite tailings as the main raw material. technology, which solves the problem of utilization of kyanite tailings to a large extent, but the technology is relatively complicated and the cost is relatively high, which is not conducive to industrial production
Another example is "a mullite lightweight brick and its preparation method" (CN103011856A) patent technology, which discloses a method for preparing mullite lightweight bricks using kyanite powder, but this technology uses kyanite as The expansion agent is used, the addition amount is not large, and the process is relatively complicated, the production cycle is long, and industrial production cannot be guaranteed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A mullite lightweight heat-insulating brick based on kyanite tailings and a preparation method thereof. First, 50~60wt% kyanite tailings, 26~36wt% plastic clay, 9~16wt% α-Al 2 o 3 Mix with 3~5wt% silicon micropowder as raw material, then add 0.9~1.2wt% polyvinyl alcohol, 50~60wt% sawdust and 40~50wt% water, mix well, and keep the material for 12~24 hours , semi-dry method vibration and pressure molding, natural drying, baking at 110°C for 14-16 hours, and holding at 1400-1500°C for 6-8 hours, that is, the mullite light weight based on kyanite tailings Insulation bricks.

[0027] The bulk density of the mullite light weight brick that present embodiment 1 makes is 0.8~1.0g / cm 3 , the thermal conductivity is 0.24~0.28W / (m·K)(600℃), the compressive strength is 4.2~6.7MPa, and the change rate of reburning line is -0.50~-0.35%(1400℃×12h).

Embodiment 2

[0029] A mullite lightweight heat-insulating brick based on kyanite tailings and a preparation method thereof. First, 55~65wt% kyanite tailings, 20~30wt% plastic clay, 10~18wt% α-Al 2 o 3 Mix with 2~4wt% silicon micropowder as raw material, then add 0.4~0.6wt% pulp waste liquid, 45~55wt% sawdust and 25~35wt% water of the raw materials, mix evenly, and store the material for 12~24 hours , semi-dry method vibration and pressure molding, natural drying, baking at 110°C for 12-14 hours, and holding at 1350-1450°C for 4-7 hours, that is, the mullite light weight based on kyanite tailings Insulation bricks.

[0030] The bulk density of the mullite light weight brick that present embodiment 2 makes is 0.7~0.9g / cm 3 , the thermal conductivity is 0.20~0.25W / (m·K) (600°C), the compressive strength is 1.7~3.5MPa, and the change rate of reburning line is -0.40~-0.30% (1400°C×12h).

Embodiment 3

[0032] A mullite lightweight heat-insulating brick based on kyanite tailings and a preparation method thereof. First, 60~70wt% kyanite tailings, 12~22wt% plastic clay, 8~16wt% α-Al 2 o 3 Mix with 2~5wt% silicon micropowder as raw material, add 0.6~0.9wt% polyvinyl alcohol, 0.1~0.3wt% pulp waste liquid, 35~45wt% sawdust and 25~35wt% water , mix evenly, trap the material for 12-24 hours, semi-dry machine press molding, dry naturally, bake at 110°C for 10-12 hours, and keep warm at 1350-1400°C for 3-6 hours to get blue-based Mullite lightweight insulation bricks from spar tailings.

[0033] The bulk density of the mullite light weight brick that present embodiment 3 makes is 0.8~0.9g / cm 3, the thermal conductivity is 0.23~0.26W / (m·K) (600°C), the compressive strength is 3.1~5.2MPa, and the change rate of reburning line is -0.30~-0.20% (1400°C×12h).

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Abstract

The invention relates to a mullite light heat-insulation brick based on kyanite tailings and a manufacturing method of the brick. According to the adopted technical scheme, the manufacturing method comprises the following steps: mixing 50-85wt% of kyanite tailings, 10-36wt% of plastic clay, 2-18wt% of alpha-Al203 and 1-5wt% of silica powder as raw materials, adding 30-60wt% of pore-forming agent, 0.1-1.4wt% of binding agent and 15-50wt% of water, uniformly mixing, ageing the mixture for 12-24 hours, forming, naturally drying, baking for 10-16 hours at 110 DEG.C, warming to 1300-1550 DEG.C, and preserving heat for 2-8 hours to obtain the mullite light heat-insulation brick based on kyanite tailings. The mullite light heat-insulation brick based on kyanite tailings has the characteristics of being environment-friendly, low in production cost and simple in process; the prepared mullite light heat-insulation brick based on kyanite tailings is high in compression strength, excellent in thermal shock stabilization, low in volume density and low in heat conductivity coefficient, and especially small in variation of re-burning line, and suitable for working surface lining of an industrial furnace.

Description

technical field [0001] The invention belongs to the technical field of mullite lightweight heat-insulating bricks, in particular to a mullite light-weight heat-insulating brick based on kyanite tailings and a preparation method thereof. Background technique [0002] Mullite lightweight brick is a kind of Al 2 o 3 The content is 50~80wt%, with mullite (3Al 2 o 3 2SiO2 2 ) is a new type of high-quality heat-insulating refractory material with a main crystal phase and a bonded phase. It can directly contact the flame. It has the characteristics of high temperature resistance, high light weight, small thermal conductivity and remarkable energy-saving effect. Kiln, electric porcelain drawer kiln, glass crucible and lining of various electric furnaces. At present, the main raw materials for the production of mullite lightweight bricks are bauxite, kyanite and sillimanite. However, with the continuous exploitation of mineral resources, its high-quality resources are gradually...

Claims

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Application Information

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IPC IPC(8): C04B33/132
CPCY02P40/60
Inventor 李远兵胡梁董文吴继海刘柳根吴清顺钟金根李淑静李亚伟桑绍柏
Owner WUHAN UNIV OF SCI & TECH
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