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The Manufacturing Method Of Fused Cast Alumina Block

Fused cast alumina block is produced by melting high purity aluminum oxide and soda ash in an electric arc furnace at more than 2000℃, pouring the liquid into graphite molds, cooling and solidifying it, and then processing the blocks into the desired shapes.

Based on the chemical compositions, fused cast alumina blocks can be divided into fused cast α alumina block, fused cast β alumina block and fused cast α-β alumina block.

Fused Cast α Alumina Block comprises of a majority of α alumina crystals and a slight portion of β alumina crystals in its compact structure with almost no glassy phase. It has high refractoriness and good strength at high temperature. It is ideal for the lower temperature zones of the glass melting furnaces due to its high density, superior corrosion resistance and low blister potential. It is also preferred for Metallurgical Titanium Furnace because the superior thermal stability.

Fused cast β alumina block comprises of a majority of β alumina crystals and a slight portion of α alumina crystals. Its property of base saturation enables a higher resistance to alkali vapor, thus it has excellent thermal shock resistance and does not form molten droplets. It is the best choice for breast wall, port mouth and top crown of float glass furnace.

Fused cast α-β alumina block is formed by the compact structure of α alumina and β alumina crystals in a most ideal proportion which is approximately 50% and 50% respectively,where intertwined crystals of both materials result in a very dense structure. It has dense structure , excellent corrosion resistance of glass melt below 1350°C and no contamination of glass melt. The typical glass contact materials for the end zones of furnaces when glass quality is the priority.

The manufacturing process of fused cast alumina blocks is similar to that of the common fused cast refractories. Because Al2O3 has low viscosity and a strong ability to crystallize, it is apt to be solidified before degassing and, as a result, have a high porosity. In order to decrease the porosity, some additions are added. For fused cast α alumina block, a little amount of additions such as B2O3 will be added. For fused cast β alumina block and fused cast α-β alumina block, Na2O is added.

Fused cast alumina block of Sunrise Refractory is made of high purity raw materials with advanced technology. They have been widely used in glass industry and other non glass industries.

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The Manufacturing Method Of Fused Cast Alumina Block

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