Alumina-magnesia refractory brick containing light porous aggregate and its making process

Abstract

The present invention relates to one kind of alumina-magnesia refractory brick containing light porous aggregate and its production process. The technological scheme is that the alumina-silica refractory brick is produced with light porous Al2O3-MgO refractory material 30-70 wt%, compact Al2O3-MgO refractory material 0-35 wt%, fine magnesia powder 5-30 wt%, fine alpha-Al2O3 powder 3-10 wt%, fine corundum powder 0-25 wt% and fine spinel powder 0-25 wt%, and through mixture, adding waste pulp liquid in 3-7 wt% as binding agent, stirring, pressing to form adobe, drying at 100-150 deg.c for 12-48 hr, sintering at 1400-1600 deg.c for 2-5 hr and naturally cooling. The alumina-magnesia refractory brick has high macro porosity, small average pore size, low heat conductivity and high medium erosion resistance, and may be used in the permanent layer or work layer in high temperature kiln, furnace and container.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to an aluminum-magnesia refractory brick containing lightweight porous aggregate and a preparation method thereof. Background technique [0002] With the world's increasing requirements for reducing energy consumption and saving energy, the requirements for lightweight insulation materials are increasing. However, traditional lightweight insulation materials such as diatomite bricks, asbestos bricks, vermiculite bricks, lightweight clay bricks, lightweight mullite and lightweight corundum bricks cannot be used in parts that are in direct contact with liquid or other media. Because it is susceptible to erosion and erosion of the working medium (Xu Pingkun, Dong Yingbang. Corundum refractories. Beijing: Metallurgical Industry Press, 1999; Wang Weibang. Refractory Technology. Beijing: Metallurgical Industry Press, 1994), affecting the service life, even Affec...

AI Technical Summary

Problems solved by technology

However, traditional lightweight insulation materials such as diatomite bricks, asbestos bricks, vermiculite bricks, lightweight clay bricks, lightweight mullite and lightweight corundum bricks cannot be used in parts that are in direct contact with liquid or other media.

Because it is susceptible to erosion and erosion of the working medium (Xu Pingkun, Dong Yingbang. Corundum refractories. Beijing: Metallurgical Industry Press, 1999; Wang Weibang. Refractory Technology. Beijing: Metallurgical Industry Press, 1994), affecting the service life, even Affect the safe production of high temperature kiln or container

On the other hand, in traditional refractory materials, people often use dense materials as aggregates. Dense aggregates require high-temperature firing and consume a lot of energy. However, during the use of refractory materials, solvents such as slag first erode the matrix, and the matrix surrounds When the matrix is ​​eroded into a metamorphic layer, the aggregate will peel off from the refractory material together with the matrix into the slag (W.E.Lee and S.Zhang, "Melt corrosion of oxide and oxide-carbon refractories" International Materials Reviews 1999 Vol. 44 No.377.), so the advantage of dense aggregate is not obvious, and it will cause a certain waste