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The Manufacturing Method Of Fused Cast AZS Block

Fused cast AZS block is abbreviated as AZS because it contains Al2O3-ZrO2-SiO2 and are widely used in the glass industry. Fused cast AZS block is made through the process of melting the raw material, casting the melt in a mold, cooling and solidifying it into the final AZS blocks: 33#, 36#, and 41#.
 
First ,fuse or melt a blended raw material of pure alumina powder, Zircon sand (composed of 65% zirconia and 34% SiO2) and a little amount of flux (Na2O or B2O3) in an arc furnace at 1800~1900℃. Then the melt are cast into various molds formed and cooled down to form 33# AZS blocks. Based on this method, by adding desilication zircon sand, 36# and 41# AZS blocks are made. 
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There are two methods to melt the raw materials: oxidization and reduction. Compared to reducing method, oxidizing method is more complex and can produce more high quality products. It can avoid pollution of the product and the final product is white or light yellow. Oxidized fused cast AZS block has lower porosity and higher exudation temperature of glass phase, which makes it have better corrosion resistance to melten glass.  
 
During the melting process, pure alumina powder is re-crystallized into corundum and the zircon is re-crystallized into baddeleyite. Thus, AZS blocks consist of two major crystalline phases (alpha-corundum and baddeleyite) and a quite large volume fraction of glassy phase. 
 
There are four casting methods for the production of the fused cast AZS block: Normal casting(PT), Tilt casting(QX), Semi-Void-Free casting(ZWS) and Void-free casting(WS). Different casting ways are used to meet different requirements. 
 
Fused cast AZS block 33# and 41# is available in a large size straight or approximate bricks and special formats and shapes which are available for special machining processes. Fused cast AZS block 36# is only available for straight brick.

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