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Mullite light bricks 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: 2013-03-06
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 light brick and a preparation method thereof. First, 50-60wt% of coal gangue and 40-50wt% of bauxite are used as raw materials, plus 13-16wt% of bran, 0.5-2.0wt% of kyanite and 0.1-0.3wt% of carboxymethyl cellulose. , mix evenly; then add 25-28wt% water of the above-mentioned raw materials to make mud material, trap the material for 24-36 hours under the conditions of temperature of 20-40 ℃ and humidity of 25-80%; The material is extruded and formed, naturally dried at room temperature for 30 to 36 hours, and finally baked at 60 to 120 °C for 20 to 24 hours, and kept at 1300 to 1350 °C for 2.5 to 6 hours to obtain mullite light bricks.

[0023] The bulk density of the mullite light bricks prepared in Example 1 is 1.0-1.3 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 light brick and a preparation method thereof. First, use 60-70wt% coal gangue and 30-40wt% bauxite as raw materials, add 12-15wt% sawdust, 1.0-2.5wt% kyanite and 0.1-0.3wt% silica sol, and mix them evenly ; Add 28-30wt% water of the above-mentioned raw materials to make mud material, trap the material for 24-36h under the conditions of temperature of 20-40 ℃ and humidity of 25-80%; then squeeze the mud after the trapped material Forming, natural drying at room temperature for 26-32 hours, and finally baking at 60-120 ℃ for 18-22 hours, and heat preservation at 1310-1360 ℃ for 3-7 hours to obtain mullite light bricks.

[0026] The bulk density of the mullite light bricks prepared in Example 2 is 0.9-1.2 g / 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 light brick and a preparation method thereof. First, 70-75wt% of coal gangue and 25-30wt% of bauxite are used as raw materials, and 11-14wt% of bran, 1.5-3.0wt% of kyanite and 0.1-0.3wt% of pulp waste liquid are added. uniform; add 30-32wt% water of the above-mentioned raw materials to make mud material, trap the material for 24-36 hours under the condition of temperature of 20-40 ℃ and humidity of 25-80%; then squeeze the trapped mud material Press molding, naturally dry at room temperature for 24-30 hours, and finally bake at 60-120 °C for 16-20 hours, and keep the temperature at 1320-1380 °C for 2.5-6 hours, to obtain mullite light bricks.

[0029] The bulk density of the mullite light 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 particularly relates to a mullite lightweight brick and a preparation method thereof. Background technique [0002] Mullite light bricks contain Al 2 O 3 50%~80%, with mullite (3Al 2 O 3 ·2SiO 2 ) is a new type of high-quality heat-insulating refractory with the main crystalline phase and the combined phase. Due to its high high-temperature structural strength, low high-temperature creep rate, small thermal expansion coefficient and good thermal shock resistance, it can be used as the working face lining of kilns in direct contact with flames, which will significantly improve the efficiency of kilns. energy saving effect. At present, most of the light insulation bricks are produced with kyanite, sillimanite and bauxite as the main raw materials, but these resources are relatively short in our country, and the cost of producing mullite light bricks with the above...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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