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Whether to use lightweight refractory bricks in high-temperature kilns depends on many factors, including process requirements, material properties, thermal properties, etc. Here are some possible reasons:
Thermal shock resistance: Lightweight refractory bricks have good thermal shock resistance, that is, when the temperature changes drastically, their thermal expansion and contraction are small, which is beneficial to reducing thermal stress and avoiding brick cracking caused by temperature changes. In some kilns that require frequent heating and cooling, the use of lightweight refractory bricks can better cope with the impact of this thermal cycle.
Thermal conductivity: Lightweight refractory bricks usually have low thermal conductivity, which is advantageous for some high-temperature kilns that need to reduce energy losses. Lower thermal conductivity can slow down the conduction speed of heat in the wall, reduce the temperature of the wall, and help maintain the stable operation of the kiln.
Reduce the load: Lightweight refractory bricks are relatively light, and their use can reduce the deadweight load of the kiln. This is beneficial for some occasions with high structural requirements and the need to reduce the weight of the equipment.
Energy saving: Lightweight refractory bricks usually have good thermal insulation properties, which can reduce the temperature of the outer wall of the kiln and reduce energy loss. This is a consideration for some high-temperature kilns that have high energy consumption requirements.
Process requirements: Different production processes may have different requirements for refractory materials. Some processes have higher requirements for heat capacity, thermal conductivity, and other properties, and lightweight refractory bricks may better meet these requirements.
However, there are also some high-temperature kiln processes or environmental conditions that may require the use of heavy refractory bricks because they may have better resistance to chemical attack, wear resistance, and other properties. Therefore, the specific choice of lightweight or heavy refractory bricks must be comprehensively considered based on the actual situation, process requirements, and equipment design.
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