High-purity low-creep-deformation electrofused mullite brick and preparation method thereof

Abstract

The invention specifically relates to a high-purity low-creep-deformation electrofused mullite brick and a preparation method thereof, belonging to the technical field of refractory materials. The high-purity low-creep-deformation electrofused mullite brick comprises the following raw materials: 5 to 15% of electrofused mullite with a particle size of 3.35 to 2 mm, 20 to 30% of electrofused mullite with a particle size of 2 to 0.85 mm, 25 to 35% of electrofused mullite with a particle size of 0.85 to 0.1 mm, 20 to 30% of electrofused mullite with a particle size of no more than 0.045 mm, 5 to8% of alpha-alumina micropowder with a particle size of no more than 0.005 mm, 1 to 4% of fused silica micropowder with a particle size of no more than 0.005 mm, and an external organic binding agentaccounting for 0.1 to 5% of the total weight of the above raw materials. The high-purity low-creep-deformation electrofused mullite brick provided by the invention is extremely low in impurity content, high in softening-point temperature under load, good volume stability at high temperature and low creep rate at high temperature. The invention also provides the preparation method which is simple,practicable, energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to a high-purity and low-creep fused mullite brick and a preparation method thereof, belonging to the technical field of refractory materials. Background technique [0002] The new generation of special glass melting furnaces generally adopt the oxy-fuel combustion technology with the characteristics of energy saving and emission reduction. The temperature of the flame space of the furnace reaches 1600 ℃ or above. The high-quality silica bricks usually used in glass furnaces are no longer safe to use. [0003] Chinese patent application 201010171542.7 (CN 101817676B) discloses a low-creep fused mullite brick and its manufacturing method. The manufacturing method is: using high-quality fused mullite raw materials together with calcined alumina raw materials, kaolin and water Adding to a grinder for fine grinding, sieving, drying, grinding and sieving again to obtain matrix powder; 60wt%-75wt% fused mullite granules are mixed with 4...

AI Technical Summary

Problems solved by technology

However, due to the use of clay, kyanite, titanium oxide, and natural quartz raw materials, the impurity content is high, and a large number of low-temperature glass phases are produced at high temperatures, which greatly reduces high-temperature performance, and the softening point under load is reduced to 1350 ° C. Creep, can no longer be used under the conditions of use above 1300°C

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