1. Fused alumina zirconium silica brick (AZS)
Fused AZS bricks are are divided into 3 grades according to the content of zirconium: 33%, 36% and 41%. The zirconium corundum bricks used in the glass industry contain 50%~70% Al₂O₃ and 20%~40% ZrO₂. The density is 3.4~4.0g/cm³, the apparent porosity is 1%~10%, and the maximum operating temperature is about 1700℃. Fused zirconium corundum bricks with zirconium content of 33% and 36% are used to build kiln pool walls, flame space parapets, port craters, port flats, port stacks, tongues, etc. 41% zirconium content fused AZS are used to build the corners of the pool wall, liquid holes and other parts where the glass liquid has the most severe erosion on the refractory material. AZS is the most widely used fused cast refractory in the glass industry.
2. Fused alumina brick
It mainly refers to fused α-β alumina brick and fused β alumina bricks, mainly composed of 92%~94% Al₂O₃ corundum crystal phase, density 2.9~3.05g/cm³, apparent porosity 1%~10%, the highest The operating temperature is around 1700°C.
Fused alumina has excellent resistance to glass dialysis and hardly pollutes the glass liquid. It is widely used in the working part pool wall, pool bottom, runner, working part forehearth pool wall, forehearth pool bottom and other parts of glass melting furnace that are in contact with glass liquid and require no refractory contamination.
3. Silica brick for glass kiln:
The main component of silica brick is SiO₂, which contains up to 99%, the density is 1.9~2g/cm³, the refractoriness is 1650 °C, the working temperature is about 1600 °C, and it is resistant to acid erosion. Flame space thermocouple hole brick, etc.
4. Alkaline refractories
Alkaline refractories mainly refer to magnesia bricks, alumina magnesia bricks, magnesia chrome bricks, and forsterite bricks. Its performance is resistant to the erosion of alkaline materials, and the refractoriness is 1900~2000℃. It is widely used in the upper wall of the regenerator of the glass melting furnace, the turret of the regenerator, the body of the regenerator, and the partial structure of the port, etc.
5. Low-pore clay bricks
Low-pore clay bricks are a type of refractory clay bricks. They are mainly made of high-alumina bauxite and charred gemstones as the main raw materials. Sillimanite and andalusite are added in proportion, and binders and adhesives are added after mixing and shaping. , low-porosity clay products that are kiln-fired after drying, the porosity is generally less than 17%.
6. Insulation bricks
The heat dissipation area of glass furnaces is large and the thermal efficiency is low. In order to save energy and reduce consumption, it is necessary to use a large number of thermal insulation materials for comprehensive thermal insulation. Especially in the regenerator, melting part, working part and other parts of the pool wall, pool bottom, turrets, walls should be insulated to reduce heat dissipation. The porosity of the thermal insulation brick is very large, the weight is very light, and the density does not exceed 1.3g/cm³. Due to the poor heat transfer performance of air, thermal insulation bricks with large porosity have a thermal insulation effect. Its thermal conductivity is 2 to 3 times lower than that of general refractory materials, so the larger the porosity, the better the thermal insulation effect. There are many different types of insulation bricks, including clay insulation bricks, silica insulation bricks, high alumina insulation bricks, etc.
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