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Mullite lightweight refractory material and preparation method thereof

A technology of refractory materials and mullite, which is applied in the field of lightweight refractory materials, can solve the problems of difficulty in ensuring foam strength and stability, reducing the yield of lightweight refractory materials, and collapse and damage of lightweight refractory materials, so as to save labor resources , Guaranteed foam stability and high yield

Active Publication Date: 2015-07-22
SUZHOU ZIGUANG WEIYE LASER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the moisture content of the prepared mud is relatively high. During the drying process in the oven, with the escape of a large amount of water, the foam is easy to burst and cause the formed lightweight refractory material to collapse and be damaged.
[0008] All in all, the chemical method and burn-off method are used to prepare lightweight refractory materials, and the physical properties of the products are poor; while the foaming method almost all uses the "foaming + drying" preparation process. On the one hand, the strength and stability of the foam ( It is difficult to ensure that the foam is not easy to break); on the other hand, in the subsequent drying process of the lightweight refractory material, the escape of moisture will easily lead to the rupture of the foam, which will cause a certain degree of damage to the lightweight refractory material and reduce the performance of the lightweight refractory material. Yield of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A mullite lightweight refractory material and a preparation method thereof. The concrete steps of described preparation method are:

[0037] The first step is to put AC foaming agent, polyethylene glycol 400, ammonium bicarbonate and water into a container under the condition of 40-50°C water bath, and stir for 15-20 minutes to prepare a foaming liquid. Wherein, the mass ratio of AC blowing agent: polyethylene glycol 400: ammonium bicarbonate: water is 1: (2~4): (1~3): (80~96).

[0038] The second step, foaming liquid, ρ-Al 2 o 3 Stir with coal gangue powder for 6 to 8 minutes, add to a mold for molding, and obtain a molded mixture. Among them, the foaming liquid: ρ-Al 2 o 3 : The mass ratio of coal gangue powder is (50~55):(1~2):100.

[0039] The third step is to freeze-dry the molded mixture in a vacuum freeze dryer for 72 to 80 hours to obtain a dried molded mixture.

[0040] The fourth step is to place the dried molding mixture in a resistance furnace, heat i...

Embodiment 2

[0043] A mullite lightweight refractory material and a preparation method thereof. The concrete steps of described preparation method are:

[0044]The first step is to put AC foaming agent, polyethylene glycol 400, ammonium bicarbonate and water into a container under the condition of 40-50°C water bath, and stir for 15-20 minutes to prepare a foaming liquid. Wherein, the mass ratio of AC blowing agent: polyethylene glycol 400: ammonium bicarbonate: water is 1: (2~4): (1~3): (88~104).

[0045] The second step, foaming liquid, ρ-Al 2 o 3 Stir with coal gangue powder for 6 to 8 minutes, add to a mold for molding, and obtain a molded mixture. Among them, the foaming liquid: ρ-Al 2 o 3 : The mass ratio of coal gangue powder is (50~55):(2~3):100.

[0046] The third step is to freeze-dry the molded mixture in a vacuum freeze dryer for 72 to 80 hours to obtain a dried molded mixture.

[0047] The fourth step is to place the dried molding mixture in a resistance furnace, heat i...

Embodiment 3

[0050] A mullite lightweight refractory material and a preparation method thereof. The concrete steps of described preparation method are:

[0051] The first step is to put AC foaming agent, polyethylene glycol 400, ammonium bicarbonate and water into a container under the condition of 40-50°C water bath, and stir for 15-20 minutes to prepare a foaming liquid. Wherein, the mass ratio of AC blowing agent: polyethylene glycol 400: ammonium bicarbonate: water is 1: (2~4): (2~4): (96~112).

[0052] The second step, foaming liquid, ρ-Al 2 o 3 Stir with coal gangue powder for 6 to 8 minutes, add to a mold for molding, and obtain a molded mixture. Among them, the foaming liquid: ρ-Al 2 o 3 : The mass ratio of coal gangue powder is (55~60):(1~2):100.

[0053] In the third step, the molded mixture is placed in a vacuum freeze dryer to freeze-dry for 76-84 hours to obtain a dried molded mixture.

[0054] The fourth step is to place the dried molding mixture in a resistance furnac...

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Abstract

The invention relates to a mullite lightweight refractory material and a preparation method of the mullite lightweight refractory material. The invention adopts the technical scheme that the method comprises the steps of preparing materials under a 40-55 DEG C water bath condition according to a mass ratio of an AC (azodicarbonamide) foaming agent to polyethylene glycol 400 to ammonium bicarbonate to water of 1:(2-5):(1-4):(80-120), stirring, preparing foaming liquid, preparing materials at a mass ratio of the foaming liquid to rho-Al2O3 to gangue powder of (50-60):(1-3):100, stirring, forming to prepare a formed mixture, putting the formed mixture in a vacuum freeze drier for freeze drying for 72-84h, preparing a dried formed mixture, putting the dried formed mixture in a resistance furnace, holding temperature at 1280-1400DEG C for 45-50min, naturally cooling with the furnace, and obtaining the mullite lightweight refractory material. The method has the characteristics of low cost, simple technology and high finished product rate, and the prepared mullite lightweight refractory material is low in volume density, high in cold crushing strength and low in heat conductivity coefficient.

Description

technical field [0001] The invention belongs to the technical field of lightweight refractory materials. It specifically relates to a mullite lightweight refractory material and a preparation method thereof. Background technique [0002] As people pay more and more attention to resources and the environment, the requirements for energy saving and consumption reduction in various high-temperature industrial fields are also getting higher and higher, and lightweight (insulation / insulation) refractories are necessary for high-temperature kilns and thermal equipment. Energy-saving materials. Therefore, the selection of lightweight refractory materials with excellent performance and low price is directly related to the energy saving and emission reduction of high-temperature industries, and at the same time helps to ensure the smooth operation of high-temperature industries. [0003] Mullite (3Al 2 o 3 2SiO2 2 , abbreviated as A 3 S 2 ) has the characteristics of high melt...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B35/66C04B35/185
Inventor 张寒赵惠忠何晴李静捷辛兆鹏刘志强余俊聂建华
Owner SUZHOU ZIGUANG WEIYE LASER TECH CO LTD
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