Low-aluminum alkali-resistant mullite brick and preparation method thereof

Abstract

The invention relates to a low-aluminum alkali-resistant mullite brick and a preparation method thereof. The raw materials for its preparation are as follows: 3-1mm high-voltage waste electric porcelain 30%-50%, 1-0.088mm synthetic low-alumina mullite 15-30%, <0.088mm synthetic low-alumina mullite 20-30%, <0.088mm silica sand Powder 5%-15%, plus 5-10% of the total weight of the above-mentioned raw material sulfurous acid pulp waste liquid. The preparation method is to knead the raw materials according to the proportion in a wet mill for 15-20 minutes, press them under a pressure of 200-250 MPa and then dry them in a kiln. Made at a temperature of 1300-1400°C for 6-8 hours. The invention uses industrial waste electrical porcelain and synthetic low-aluminum mullite as main raw materials, has good alkali corrosion resistance, high temperature resistance and thermal shock resistance, and can be widely used in the preheating decomposition zone of cement kiln.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and relates to an aluminum-silicon refractory material, in particular to a low-aluminum alkali-resistant mullite brick and a preparation method thereof. Background technique [0002] At present, the refractory materials in the preheating decomposition zone of the new dry-process cement rotary kiln in my country are mainly equipped with silica bricks. Although they can meet the production needs, the use of this product brings the following problems: all silica bricks use first-grade or super-grade bauxite, and Adding SiC with a mass ratio of 10%-25%, the production cost is high; and its high thermal conductivity increases the fuel consumption per ton of cement kiln, resulting in energy waste; The alkaline corrosion ability of the base is insufficient, and the phenomenon of alkali cracking occurs, which affects the service life. Therefore, no matter from the consideration of saving refr...

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Problems solved by technology

[0002] At present, the refractory materials in the preheating decomposition zone of the new dry-process cement rotary kiln in my country are mainly equipped with silica bricks. Although they can meet the production needs, the use of this product brings the following problems: all silica bricks use first-grade or super-grade bauxite, and Adding SiC with a mass ratio of 10%-25%, the production cost is high; and its high thermal conductivity increases the fuel consumption per ton of cement kiln, resulting in energy waste; Insufficient alkali corrosion ability, alkali cracking phenomenon occurs, affecting service life

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