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A kind of mullite lightweight brick and preparation method thereof

A light brick and mullite technology, applied in the field of mullite light brick and its preparation, can solve the problems of high production cost, long production cycle, low production efficiency, etc., achieve good economic and social benefits, improve The effect of thermal insulation performance and low production cost

Inactive Publication Date: 2011-12-14
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main shortcoming of this method is reflected in: (1) the utilization rate of solid waste coal gangue is too low, and the highest usage is only 40wt%, and production cost is relatively high
(2) The coal gangue used is calcined coal gangue, and the heat released by the burning of coal gangue to form pores and its component carbon was not fully utilized, which indirectly caused the waste of coal gangue
(3) This method is used for foam casting, which has a long production cycle and low production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A mullite lightweight brick and a preparation method thereof. First, 50-60wt% coal gangue and 40-50wt% bauxite are used as raw materials, plus 13-16wt% bran, 0.5-2.0wt% kyanite and 0.1-0.3wt% carboxymethyl cellulose , and mix evenly; then add 25-28wt% of the above-mentioned raw materials to make mud, and trap the mud for 24-36h under the conditions of temperature 20-40°C and humidity 25-80%; then put the trapped mud The material is extruded, dried naturally at room temperature for 30-36 hours, finally baked at 60-120°C for 20-24 hours, and kept at 1300-1350°C for 2.5-6 hours to obtain mullite lightweight bricks.

[0023] The bulk density of the mullite lightweight bricks prepared in Example 1 is 1.0 to 1.3 g / cm 3 , the thermal conductivity is 0.38~0.55w / (m·k), and the compressive strength reaches 12.4~20.0MPa.

Embodiment 2

[0025] A mullite lightweight brick and a preparation method thereof. First, 60-70wt% coal gangue and 30-40wt% bauxite are used as raw materials, plus 12-15wt% sawdust, 1.0-2.5wt% kyanite and 0.1-0.3wt% silica sol, and mix well Add 28-30wt% of the above-mentioned raw materials to make mud, and trap the mud for 24-36 hours at a temperature of 20-40°C and a humidity of 25-80%; then extrude the trapped mud Molded, dried naturally at room temperature for 26-32 hours, finally baked at 60-120°C for 18-22 hours, and kept at 1310-1360°C for 3-7 hours to obtain mullite lightweight bricks.

[0026] The bulk density of the mullite lightweight bricks prepared in Example 2 is 0.9~1.2g / cm 3 , the thermal conductivity is 0.35~0.50w / (m·k), and the compressive strength reaches 8.0~16.8MPa.

Embodiment 3

[0028] A mullite lightweight brick and a preparation method thereof. First, 70-75wt% coal gangue and 25-30wt% bauxite are used as raw materials, plus 11-14wt% bran, 1.5-3.0wt% kyanite and 0.1-0.3wt% pulp waste liquid, mixed uniform; then add 30-32wt% of the above raw materials to make mud, and trap the mud for 24-36 hours under the conditions of temperature 20-40°C and humidity 25-80%; then squeeze the trapped mud Press molding, dry naturally at room temperature for 24-30 hours, finally bake at 60-120°C for 16-20 hours, and keep warm at 1320-1380°C for 2.5-6 hours to obtain mullite lightweight bricks.

[0029] The bulk density of the mullite lightweight bricks prepared in Example 3 is 0.8 to 1.0 g / cm 3 , the thermal conductivity is 0.28~0.40w / (m·k), and the compressive strength reaches 6.8~12.4MPa.

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Abstract

The invention relates to mullite light bricks and a preparation method thereof. The invention adopts a technical scheme that the preparation method comprises: uniformly mixing 50 to 90 weight percent of coal gangue and 10 to 50 weight percent of alumina, which serve as raw materials, and 8 to 16 weight percent of pore forming agent, 0.5 to 5 weight percent of swelling agent and 0.05 to 0.5 weightpercent of bonding agent; adding water in an amount which is 25 to 40 weight percent based on the raw materials to make a mud material, and aging the mud material for 24 to 36 hours under conditions of a temperature of 20 to 40 DEG C and a humidity of 25 to 80 percent; and performing extruding forming of the aged mud material, and drying for 12 to 36 hours naturally under a room temperature condition; and firing for 12 to 24 hours under a condition of a temperature of 60 to 120 DEG C, performing heat preservation for 2.5 to 12 hours under a condition of a temperature of 1,300 to 1,550 DEG C, and thus, obtaining mullite light bricks. The preparation method disclosed by the invention has the advantages of resource conservation, environment friendliness and continuous production; and the prepared mullite light bricks have the characteristics of high strength and high thermal shock resistant stability, can be directly used as working surface liners for industrial kiln furnaces and can create good economic and social benefit.

Description

technical field [0001] The invention belongs to the technical field of lightweight refractory materials, and in particular relates to a mullite lightweight brick and a preparation method thereof. Background technique [0002] Mullite lightweight bricks contain Al 2 o 3 50% to 80%, 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 combined phase. Due to its higher high-temperature structural strength, lower high-temperature creep rate, smaller thermal expansion coefficient and good thermal shock resistance, it can be used as the lining of the working face of the kiln directly in contact with the flame, which will significantly improve the performance of the kiln. energy-saving effect. At present, kyanite, sillimanite and bauxite are mostly used as the main raw materials for the production of lightweight insulation bricks, but these resources are relatively short in my country, and the cost...

Claims

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Application Information

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IPC IPC(8): C04B35/185C04B35/622C04B38/00
Inventor 李远兵刘静静黄志明赵雷李亚伟雷中兴金胜利王兴东李淑静
Owner WUHAN UNIV OF SCI & TECH
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