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Heat-insulating and fire-resistant calcium alumino-titanate material and preparation method thereof

A refractory material, calcium titanate aluminate technology, applied in the field of thermal insulation refractory materials, can solve the problems of high temperature strength decrease, thermal conductivity increase, high bulk density and the like of calcium titanate aluminate thermal insulation materials, so as to achieve excellent thermal shock resistance, The effect of low thermal conductivity and low bulk density

Active Publication Date: 2018-09-21
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] "A Calcium Aluminate Titanate Thermal Insulation Material and Its Preparation Method" (CN106747527A) patent technology, although the calcium aluminate titanate thermal insulation material prepared by the foaming method has a low thermal conductivity, due to the Ca((Al 0.84 Ti 0.16 ) 2 ) 6 o 19 Titanium oxide that is stripped out at high temperature will exist in CA 6 Between the grains, resulting in a decrease in the high-temperature strength and an increase in the thermal conductivity of the calcium aluminate thermal insulation material
"A lightweight mullite-silicon carbide refractory material and its preparation method" (CN103553650A) patent technology, using porous mullite-silicon carbide particles, mullite fine powder, silicon carbide fine powder, etc. Compression forming, the pores are formed by the gas generated by the decomposition of aluminum hydroxide and magnesium carbonate at high temperature. Although the lightweight mullite-silicon carbide refractory has high strength, it still has a high volume density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A calcium aluminate heat-insulating refractory material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0022] The first step, according to the mass ratio of calcium aluminate titanate fine powder: coke powder (8~8.4): 1, premix the calcium aluminate titanate fine powder and the coke powder for 1~2 hours to obtain premixed material; then the premixed material is placed in a tube furnace, kept at 1600-1650°C in a nitrogen atmosphere for 1-1.6 hours, cooled with the furnace, crushed, and magnetically separated; then kept at 1400-1430°C After 0.5~0.8 hours, cool with the furnace, crush, and grind to a particle size of ≤0.088mm to obtain a mixture.

[0023] The second step, adding sodium dodecylbenzenesulfonate, 6~8wt% dextrin, 0.2~0.5wt% sodium polyacrylate and 35~ 37wt% water, stirring for 6~8min, vibration molding, curing at room temperature for 8~12h, drying at 100~110°C for 20~24h, and holding at 1400~1450°C f...

Embodiment 2

[0026] A calcium aluminate heat-insulating refractory material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0027] The first step, according to the mass ratio of calcium aluminate titanate fine powder: coke powder (8.2~8.6): 1, premix the calcium aluminate titanate fine powder and the coke powder for 1~2 hours to obtain premixed material; then the premixed material is placed in a tube furnace, kept at 1650-1700°C in a nitrogen atmosphere for 1.4-2.0 hours, cooled with the furnace, crushed, and magnetically separated; then kept at 1420-1450°C After 0.7~1.0 hours, cool in the furnace, crush, and grind to a particle size of ≤0.088mm to obtain a mixture.

[0028] Second step, adding sodium dodecylbenzenesulfonate, 4~6wt% dextrin, 0.2~0.5wt% sodium polyacrylate and 36~ 38wt% water, stirring for 6~8min, vibration molding, curing at room temperature for 8~12h, drying at 100~110°C for 20~24h, and holding at 1400~1450°C for...

Embodiment 3

[0031] A calcium aluminate heat-insulating refractory material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0032] The first step, according to the mass ratio of calcium aluminate titanate fine powder: coke powder (8.4~8.8): 1, premix the calcium aluminate titanate fine powder and the coke powder for 1~2 hours to obtain premixed material; then the premixed material is placed in a tube furnace, kept at 1600-1650°C in a nitrogen atmosphere for 1-1.6 hours, cooled with the furnace, crushed, and magnetically separated; then kept at 1400-1430°C After 0.5~0.8 hours, cool with the furnace, crush, and grind to a particle size of ≤0.088mm to obtain a mixture.

[0033] Second step, add sodium dodecylbenzenesulfonate, 5~7wt% dextrin, 0.2~0.5wt% sodium polyacrylate and 37~ 39wt% water, stirring for 6-8min, vibration forming, curing at room temperature for 8-12h, drying at 100-110°C for 20-24h, and holding at 1450-1500°C for 2-...

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Abstract

The invention relates to a heat-insulating and fire-resistant calcium alumino-titanate material and a preparation method thereof. According to the technical scheme, the method comprises the steps thatfine calcium alumino-titanate powder and coke powder are pre-mixed in a mass ratio of (8-9):1, and then placed in a tube furnace, heat preservation is conducted at the temperature of 1600-1700 DEG Cin the nitrogen atmosphere, and cooling, crushing and magnetic separation are conducted in sequence; heat preservation is conducted at the temperature of 1400-1450 DEG C, cooling and crushing are conducted, grinding is conducted until the particle size is smaller than or equal to 0.088 mm, and a mixture is obtained; sodium dodecyl benzene sulfonate accounting for 2-3 wt% of the mixture, dextrin accounting for 3-8 wt% of the mixture, sodium polyacrylate accounting for 0.2-0.5 wt% of the mixture and water accounting for 35-40 wt% of the mixture are added into the mixture, stirring, forming, maintaining and drying are conducted in sequence, heat preservation is conducted at the temperature of 1400-1500 DEG C, and the heat-insulating and fire-resistant calcium alumino-titanate material is obtained. The preparation method has the advantages of being low in cost, simple in process and high in yield. The heat-insulating and fire-resistant calcium alumino-titanate material has the advantages of being small in bulk density, high in compression strength, high in high-temperature breaking strength, small in heat conductivity coefficient and high in thermal shock resistance.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation refractory materials. In particular, it relates to a calcium aluminate heat-insulating refractory material and a preparation method thereof. Background technique [0002] At present, the average thermal efficiency of industrial kiln linings in my country is less than 40%, which is about 20% lower than that of industrial furnaces in developed countries. As an essential energy-saving material for thermal equipment, lightweight refractory materials have the advantages of low thermal conductivity, good thermal shock stability and high temperature resistance. Therefore, it is of great significance to vigorously develop high-efficiency thermal insulation technology. In addition, with the massive accumulation of industrial waste residues, it is of great practical significance to rationally recycle industrial waste residues to achieve sustainable development. [0003] "A Calcium Aluminate Ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/465C04B35/636C04B35/634C04B35/626C04B38/10
CPCC04B35/465C04B35/6261C04B35/62645C04B35/6268C04B35/63424C04B35/6365C04B35/66C04B38/10C04B2235/77C04B2235/96C04B2235/9607C04B38/0067
Inventor 赵惠忠陈建威张寒余俊王相辉刘艳丽冯立
Owner WUHAN UNIV OF SCI & TECH
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