Calcium hexaluminate and corundum composite porous light heat insulation refractory material and preparation method thereof

A calcium hexaaluminate, lightweight heat insulation technology, applied in the field of refractory materials, can solve the problems of low strength affecting service life, high thermal conductivity, affecting energy saving effect, etc.

Active Publication Date: 2010-12-29
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of high thermal conductivity of corundum series lightweight refractory bricks used in kiln lining which affect the energy saving effect, and the low strength of lightweight calcium hexaaluminate heat insulating refractory materials affects the service life and other problems, and utilizes the high temperature resistance of corundum Good, calcium hexaaluminate has low thermal conductivity, good stability in high temperature reducing atmosphere, good alkali corrosion resistance and slag corrosion resistance, and calcium hexaaluminate and Al 2 o 3 Based on the characteristics of very close expansion coefficients, a calcium hexaaluminate and corundum composite porous lightweight heat-insulating refractory material and its preparation method are proposed to achieve high-efficiency, energy-saving, long-life lightweight refractory for high-temperature industrial kiln linings bricks, thereby contributing to energy saving in high-temperature industries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw materials and ratio:

[0018] Calcium carbonate (requires CaCO 3 ≥99.0%) as calcium source, aluminum hydroxide (requires Al(OH) 3 ≥99.0%) is the aluminum source, and the particle size of the raw material is less than 0.15mm.

[0019] Ingredients, Grind:

[0020] Firstly, the various raw materials according to Al 2 o 3 / CaO>6 (molar ratio) is loaded into the mill and ground to a sieve with an aperture of less than 0.060mm, and the sieve residue is less than 3.0wt.%.

[0021] Add pore forming agent and stir to form:

[0022] Add polystyrene balls accounting for 8.0% of the total batching, 4.0% wood chips and sawdust (requiring its particle diameter≤3.0mm) of the total batching, stir and mix the ball milled mixture with polystyrene balls and wood chips and sawdust for 10 minutes, then Add 6% potable water and stir for 5 minutes, and the mud material obtained is molded by pressurized vibration casting.

[0023] dry:

[0024] The formed wet body is naturally drie...

Embodiment 2

[0032] Raw materials and ratio:

[0033] With calcium oxide (required CaO≥99.0%) as calcium source, γ-Al 2 o 3 (Requires Al 2 o 3 ≥99.0%) is the aluminum source, and the particle size of the raw material is less than 0.15mm.

[0034] Ingredients, Grind:

[0035] Firstly, the various raw materials according to Al 2 o 3 The ratio of / CaO>6 (molar ratio) is loaded into a ball mill for 12 hours, and the raw materials are ground to a size of less than 0.060mm and the sieve residue is less than 3.0wt.%.

[0036] Add pore forming agent and stir to form:

[0037] Add 10% polystyrene balls (requiring its particle diameter≤3.0mm) that account for total batching 10%, mix the ball-milled mixture and polystyrene balls for 10 minutes, then add 6% potable water and stir for 5 minutes, The obtained mud is molded by pressurized vibration casting.

[0038] dry:

[0039] The formed wet body is naturally dried at room temperature for 12 hours, then dried in a drying kiln at 100°C for 4 ...

Embodiment 3

[0047] Raw materials and ratio:

[0048] Calcium carbonate (requires CaCO 3 ≥99.0%) as calcium source, γ-Al 2 o 3 (Requires Al 2 o 3 ≥99.0%) is the aluminum source, and the particle size of the raw material is less than 0.15mm.

[0049] Ingredients, Grind:

[0050] Firstly, the various raw materials according to Al 2 o 3 The ratio of / CaO>6 (molar ratio) is loaded into a ball mill for 12 hours, and the raw materials are ground to a size of less than 0.060mm and the sieve residue is less than 3.0wt.%.

[0051] Add pore forming agent and stir to form:

[0052] Add 10.0% coke powder and 4.0% sawdust (requiring its particle diameter≤3.0mm) that account for total batching, mix with coke powder and stir and mix for 30 minutes, then add 13% potable water and stir for 5 minutes to obtain The mud material is formed by vibratory casting to obtain a green body.

[0053] dry:

[0054] The formed wet body is naturally dried at room temperature for 12 hours, then dried in a dryin...

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Abstract

The invention relates to a calcium hexaluminate and corundum composite porous light heat insulation refractory material, in particular to a high-quality refractory material for high temperature kiln liners, which has the advantages of low heat conductivity, high strength, high stability in high-temperature reducing atmosphere, high alkali and scouring corrosion resistance and long service life, and belongs to the technical field of refractory materials. The main phases of the refractory material are a calcium hexaluminate phase and a corundum phase; and the main chemical compositions of the refractory material are Al2O3 and CaO which account for over 95 weight percent. CaCO3, Ca(OH)2, CaO and the like are taken as calcium sources, and Al2O3, Al(OH)3 and the like are taken as aluminium sources; and a preparation method comprises the following steps of: uniformly mixing Al2O3 and CaO according to a molar ratio of more than 6, grinding, adding a certain amount of pore-forming material, uniformly stirring, and performing a series of technological processes such as forming, drying, sintering, cutting and the like to prepare the calcium hexaluminate and corundum composite porous light heat insulation refractory material. The heat insulation refractory material is a light refractory brick for the high temperature kiln liners, which has the advantages of low heat conductivity, high strength and long service life, and can provide high-efficiency and energy-saving guarantee for industrial furnace equipment.

Description

Technical field: [0001] The invention relates to a calcium hexaaluminate and corundum composite porous lightweight heat-insulating refractory material and a preparation method thereof, belonging to the field of refractory materials. Background technique: [0002] my country's economy is developing rapidly, but the development of energy production is much lagging behind. During the "Tenth Five-Year Plan" period, my country's economy maintained a growth rate of 9%, while the growth rate of primary energy production only reached about 4%. Another way to solve the energy shortage is to save energy, that is, to reduce heat loss, improve the utilization efficiency of heat energy, and reduce energy waste. Internationally, energy-saving projects are regarded as the "fifth energy source", and its significance is very important. According to calculations by relevant state departments, due to poor insulation of various kilns and heat pipes in my country, the annual heat loss is equiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 易帅黄朝晖房明浩刘艳改
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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