Fused cast AZS refractory is an indispensable building material for glass melting furnaces, and its production technology and quality directly affect the quality of molten glass and the life of the furnace. The development of the glass industry has increased the temperature of the flame space of the glass furnace and has also brought a large amount of SO3, V2O5, water vapor, and alkaline volatiles. This puts forward higher requirements on refractories for glass furnaces, especially fused cast AZS refractories used in superstructures. In order to meet and meet the development needs of the glass industry, a variety of new fusion cast AZS refractories have been developed one after another. At the same time, due to the limitations of the production process and the material itself, the inhomogeneity of the fused cast AZS bricks is caused, and the results of the physical and chemical properties analysis of different parts of the material are also different. Therefore, each batch of fused cast AZS refractories must undergo strict testing and quality supervision in accordance with the requirements of the standard JC/T493-2015 “Fused Cast Zirconium Corundum Refractory Products for Glass Furnace”. Provide a guarantee for the safe and stable operation of the glass furnace and the production of high-quality glass products.
Fused Cast Zirconia Corundum Refractory
Fused cast zirconium corundum AZS refractories are made of industrial alumina, quartz sand, and de-siliconized zirconium as the main raw materials, plus a small amount of Na2O flux, which is added in the form of sodium carbonate. Refractory products formed by casting after melting in an electric arc furnace. Usually, according to the content of zirconium dioxide, the solution cast AZS refractories are divided into three varieties: No. 33, No. 36, and No. 41 (AZS33#, AZS36#, AZS41#).
AZS33# is the most widely used and most widely used product among fused cast AZS series products. It is mainly suitable for the upper structure of the melting tank, the wall and bottom of the working tank, and the feeding channel.
AZS36# has the same aluminum-zirconium eutectic as AZS33# fused zirconia corundum bricks, but also adds more chain-like zirconia crystals. At the same time, the glass phase content is low. Therefore, the corrosion resistance is further enhanced. Therefore, it is suitable for areas where the flow rate of the molten glass is relatively fast or the temperature is relatively high, such as key parts such as the wall near the hot spot of the melting pool.
AZS41# contains more uniformly distributed zirconia crystals. Among the cast AZS series products, its corrosion resistance is the best. Therefore, the key part of the glass furnace was selected. Such as the corners of the feed inlet, the liquid hole, the kiln ridge, the bubbling at the bottom of the pool, etc. So that the life of these parts can be balanced with the life of other parts.
Precautions for the Detection of Fused Cast Zirconia Corundum Refractories
Refractory performance testing is the quality level of refractory materials detected under certain controlled conditions. Correct performance testing can correctly evaluate the physical quality of refractory materials. Through performance testing, find out the relationship between various factors and quality, so as to propose ways to improve quality and evaluate its effects. It is very useful for optimizing the composition and structure of materials, improving the production process, and improving quality. The microstructure and production process of fused cast refractories are very different from other refractory materials. It is also different from other refractory materials in the nature of use. In addition to common properties, there are also important properties that other refractory materials do not have, such as resistance to glass liquid corrosion, glass phase exudation temperature, exudation volume, and bubble precipitation rate.
In order to achieve the long life of the glass melting furnace and obtain high-quality glass at the same time, it is necessary to use refractory materials that are highly resistant to corrosion by the molten glass. Therefore, determining the static resistance of AZS products to molten glass corrosion is a key indicator to characterize whether the material can be used in glass melting furnaces and the quality.
AZS products that have been in contact with molten glass for a long time will undergo physical and chemical changes due to the material itself or when the refractory material contacts the molten glass during actual use. Thus, there is a tendency to generate bubbles. For example, AZS products in the clarification part, the cooling part, and the runner part. If the bubbles generated at the working temperature are difficult to eliminate or continue to generate bubbles, it will affect the quality of the molten glass, and may even cause bubble defects in the glass. Therefore, measuring the bubble precipitation rate of AZS products is also an important indicator for judging their performance.
In addition, the glass phase of AZS products will ooze out in a high-temperature environment, becoming a weak link in the fused cast refractory material and a channel through which corrosive substances are easy to diffuse, affecting the service life of the material. At the same time, it will also affect the quality of molten glass. Therefore, the determination of the primary precipitation temperature of the glass phase and the amount of exudation are important indicators for evaluating the performance of this kind of material.
Get Refractory Prices from Rongsheng Refractory Manufacturer
Rongsheng is a refractory material manufacturer with rich experience in production and sales. Get Rongsheng’s refractory prices, and Rongsheng Refractory materials products have been sold to more than 60 countries and regions all over the world. For example, Russia, South Africa, Kazakhstan, Philippines, Chile, Malaysia, Uzbekistan, Indonesia, Vietnam, Kuwait, Turkey, Zambia, Peru, Mexico, Qatar, etc., and received good reviews and return orders from customers. Customers will regularly supplement their refractory needs from us. If you need to buy high-quality AZS products for glass kilns, please contact us. We will provide you with requirements according to your specific needs.