What is Glass kiln zirconium ramming material？
In the construction of glass melting furnaces, there are two commonly used zirconium ramming materials, namely zirconium ramming materials and fused cast AZS ramming materials. Although both zirconium ramming materials have good resistance to glass It has excellent liquid erosion properties and has very low pollution to the glass liquid. However, it still needs to be reasonably selected according to the properties of the glass produced.
Ramming materials are composed of gas phase, crystal phase and glass phase. Although the existence of glass phase is beneficial to sintering, compared with the crystal phase, its resistance to the erosion of glass liquid is poor, which is the weak link in the erosion resistance of ramming materials and other refractory materials. The properties and content have an important impact on the performance of ramming materials.
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The pores are the pathways through which the glass liquid penetrates into the ramming material. The porosity is high and the ramming material has poor resistance to chemical erosion. This is because most of the pores are concentrated in the binding phase. Once the glass liquid penetrates into the ramming material, the gas phase, glass phase and The corrosive agents blend with each other to form weak points that resist erosion. Therefore, if the chemical composition is constant, the lower the total porosity, the greater the erosion resistance.
The type and composition of the corrosive agent also play a large role in the erosion resistance of the ramming material. In glass furnaces, the corrosive agent mainly refers to high-temperature glass liquid and dense metal or metal oxide deposited on the bottom of the tank. Different glass liquids have different effects on ramming materials, and the characteristic rates and forms of erosion are very different between soda-lime-silica glass, borosilicate glass, lead glass and other types of glass.
The main difference between fused cast AZS ramming material and zircon ramming material lies in the Al2O3 content and porosity. Since there are masonry gaps in the paving bricks located on the upper layer of the zirconium ramming material, the glass liquid will penetrate into the ramming layer through the brick gaps. The corrosion resistance of the ramming material will vary depending on the chemical composition, movement speed and temperature of the glass liquid. different. The soda-lime-silica glass melt is highly corrosive because the melt contains ionized alkali. When they come into contact with the ramming material, the ionized alkali is the driving force of the corrosion mechanism. The viscosity of the melt also has a great influence on the erosion rate, regardless of the scope of the glass system, and the erosion increases sharply as the viscosity decreases.
The following is a further explanation of the effects of zircon ramming materials and fused AZS ramming materials when they come into contact with alkaline glass liquid.
(1) The fused cast AZS ramming material is in contact with the alkaline glass liquid, and an aluminum (Al2O3) layer is formed at the contact interface. The degree of ZrO2 in the ramming material melting into the glass liquid is very low, the viscosity increases, and the interface layer has a dull Chemical properties, the ramming material has enhanced resistance to mechanical wear and chemical erosion.
(2) The zircon ramming material is in contact with the alkaline glass liquid. Since there is no aluminum in the zircon ramming material, the zircon is easily decomposed. The decomposed SiO2 will reduce the viscosity, thereby accelerating erosion, resulting in The ramming layer is damaged.
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