Large-sized special-shaped composite magnesium aluminate spinel product and technique for producing the same

Abstract

The invention relates to large or specific compound magnesium-aluminum spinel products with the formula of 48 to 56 percent of 5-1mm magnesium-aluminum spinel, 12 to 22 percent of 1-0.088mm magnesium-aluminum spinel, 16 to 25 percent of magnesium-aluminum spinel with d90 less than 0.088mm, 3 to 6 percent of magnesium-aluminum spinel with d90 less than 0.010mm, 3 to 15 percent of beta alumina powder with d95 less than 0.020mm, 2 to 6 percent of hydratable alumina, 1 to 5 percent of magnesium promoter, 0.05 to 0.4 percent of external efficient water reducing agents (polycarboxylic acid plus sulfonation naphthaldehyde polymer plus sulfonation melamine polymer), 1 to 6 percent of latex of the system of external polyacrylic acid and 1 to 6 percent of external water. The magnesium-aluminum spinel composite combined refractory has the following chemical compositions: 72 to 87 percent of Al2O3, 12 to 27 percent of MgO, 0.2 to 1.5 percent of Na2O and 0.1 to 0.5 percent of SiO2. The raw materials are weighed according to the ratios, and are mixed, molded and maintained to make billets, and then are subjected to the processes of drying, firing at the temperature of 1430 to 1650 DEG C and inspection and the like so as to make products of large or specific compound magnesium-aluminum spinel refractory. The magnesium-aluminum spinel product has excellent manufacturing performance and excellent performances of high-temperature resistance, erosion resistance and creep resistance. As the products are casted and moulded, large and specific products can be produced.

Description

technical field [0001] The invention relates to a composite magnesium-aluminum spinel refractory material, which has the advantages of high temperature resistance, thermal shock resistance, wide sintering temperature range, and is convenient for manufacturing large-scale and special-shaped products. The material is suitable for various high-temperature kilns, such as making It is a brick for the lattice body of ordinary glass kilns and the superstructure of all-oxygen glass melting kilns. Background technique [0002] With the improvement of energy-saving requirements, high-temperature kilns need to use a large number of refractory materials with excellent performance or special shapes. For example, in order to prolong the service life and improve the heat exchange capacity, the glass kiln regenerator needs to have excellent corrosion resistance, creep resistance and lattice body with special shape and size. In addition, the upper structure of the oxy-fuel combustion glass ...

AI Technical Summary

Problems solved by technology

The sintering temperature of this process is high, the sintering range is narrow, and deformation, cracking, and underfiring are prone to occur during sintering, and it is inconvenient to manufacture large-sized or special-shaped products due to the limitations of molds and presses.