AZS Zircon Ramming Material
AZS Zircon Ramming Material
AZS zircon ramming material is a kind of refractory bricks with good construction performance and strong anti-erosion ability.azs zircon ramming material It is widely used in glass melting furnaces, frit kilns and some foundry plants. It is a white solid formed by pure alumina powder and zircon sand. It contains 65% zircon sand and about 34% alumina sand.
Generally, alumina refractory materials are classified into two types: clay-based and nonclay-based products.azs zircon ramming material The former are bonded by liquid-sintering processes and the latter by chemical reactions between constituents. During a glass melting process, the liquid-sintering process binds particles together in order to produce partial vitrification. The reaction-bonded products, such as alumina bricks, are much stronger than the nonclay-based products.
The chemical stability of clay-based refractories is very poor. The high refractoriness of alumina-based refractories is mainly attributed to the presence of alumina and other chemical additives such as phosphate. Moreover, the presence of chemical additives increases the temperature of the refractory material during firing and reduces its strength.
In addition, the refractory materials in a glass melting furnace also need to be resistant to corrosion and oxidation from the air. The alumina-based products have a very strong resistance to corrosion from air and are generally considered as one of the strongest refractories for glass melting furnaces.
Due to the strong resistance of alumina-based bricks to air and oxygen, a glass melting furnace can operate at higher temperatures. In particular, the temperature of a fused cast AZS brick roof can reach 1600 or 1700 °C, which is the highest operating temperature for a refractory material in a kiln. This is because the alumina-based bricks can withstand the air and oxygen in the glass pool more effectively.
Alumina-based refractory bricks are the most commonly used materials in a refractory kiln and have a wide range of applications, including superstructures, side walls, paving blocks and forehearth channel bricks. In general, alumina-based bricks have excellent chemical and thermal properties and can prevent stoning of the glass matrix by controlling its crystal structure.
This is because alumina-based bricks are phased as eutectoids of corundum and zircon, and their glassy phases are filled between the crystals. In addition to the corrosion resistance of alumina-based bricks, their glassy phases are able to retain their glassy phase when they re-melt after cooling, thus greatly increasing their refractoriness.
However, the refractory bricks are also susceptible to erosion by other refractory bricks. This is especially true of the doghouse corner bricks. The corners of the doghouse bricks are the most prone to wear and tear because of their proximity to the hot zone, which causes strong abrasion and erosion of the doghouse corner. In addition, the doghouse corner bricks are subject to abrasion and wear due to the difference in temperature between the inside and outside of the bricks.
Therefore, it is necessary to use special refractory bricks to protect the corners of the doghouse bricks. Specifically, azs-33 fused cast refractory bricks with low chromium content are recommended. They are characterized by low chromium, which helps to improve the service life of the kiln.
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