A formula and preparation method of high-temperature mullite lightweight insulation brick
A technology of mullite and thermal insulation bricks, which is applied in the field of refractory materials, can solve the problems that cannot be eliminated, high harmful impurities, and affect the use temperature of products
Active Publication Date: 2016-04-13
洛阳北苑新材料技术有限公司
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Problems solved by technology
The harmful impurities in these raw materials are relatively high and cannot be eliminated, which directly affects the use temperature of the product
Method used
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[0021] a), ingredients; see Table 1 for raw materials and ratios.
[0022] Table 1
[0023]
[0024] b) Mix the above raw materials evenly in a blender according to the ratio.
[0025] c) Put the mixture into a wooden mold or metal mold and mold it into a green body on a vibrating press. The molding pressure is shown in Table 2.
[0026] d) Put the molded green body into a drying box or a drying oven for drying. See Table 2 for the drying temperature.
[0027] e) Put the dried body into a high-temperature kiln for sintering, see Table 2 for the sintering temperature.
[0028] Table 2
[0029]
[0030] The performance indicators of the prepared mullite lightweight insulation bricks are shown in Table 3.
[0031] table 3
[0032]
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Abstract
The invention discloses a formula of a light high-temperature mullite heat-insulating brick. The formula comprises 25-45wt% of silica flour, 55-75wt% of alumina powder, saw powder and bonding agents, wherein the saw powder occupies 15-20wt% of the silica flour and the alumina powder, and the bonding agents occupy 5-10wt% of the silica flour and the alumina powder. The preparation method of the light high-temperature mullite heat-insulating brick includes the detailed steps: a) compounding according to the formula; b) uniformly mixing the raw materials in the proportion in a stirrer; c) filling the mixture subjected to the step b) into a wood mould or a metal die for forming on a vibration press, wherein the forming pressure is 5-8Mpa; d) drying a formed blank for 6-10 hours at the temperature of 80-100 DEG C; and e) placing the dried blank into a high-temperature kiln for sintering at the temperature of 1550-1650 DEG C, and maintaining the temperature for 6-10 hours. By the preparation method, use temperature of the light high-temperature mullite heat-insulating brick can be greatly increased, and heat-insulating effects are excellent.
Description
technical field [0001] The invention relates to the technical field of refractory materials, in particular to a formula of high-temperature mullite lightweight insulation brick and a preparation method thereof. Background technique [0002] Mullite (3Al 2 o 3 2SiO2 2 ) Due to its high melting point (melting point is 1870-1920°C), it is a high-quality refractory material with stable high-temperature performance. [0003] Mullite lightweight thermal insulation brick is currently the most commonly used refractory thermal insulation material in foreign countries. Its biggest disadvantage is that the operating temperature is low, mostly below 1500 °C. The main reason is that the product contains low melting point impurities (such as Fe 2 o 3 、K 2 O, Na 2 O, TiO 2 etc.) caused by higher. The raw materials usually used in ordinary mullite lightweight insulation brick products are mostly continuous, aluminum-silicon-based natural materials, such as clay, bauxite, burnt gems...
Claims
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IPC IPC(8): C04B35/66
Inventor 张拯雷复兴孙学义刘广彬
Owner 洛阳北苑新材料技术有限公司