The selection of refractory materials for kilns: Currently, most industrial high-temperature kilns are made of refractory and insulation materials, including refractory bricks, castables, insulation bricks, ceramic fiber wool, blankets, felt, and so on.
Selection of refractory material varieties
A. How to selection?
1 The selected refractory material should meet the technical conditions inside the furnace (high and low furnace temperature), furnace temperature fluctuations, slag erosion, and mechanical external impact, To ensure sufficient service life.
2 Choose different refractory materials for different parts. That is to say, a mixing furnace shooting should be designed. Low priced clay bricks above the liquid level in aluminum melting reflection furnaces and melt pools can meet technical requirements. If the aluminum liquid below the liquid level corrodes the clay bricks, high alumina bricks should be used Low heat loss, heating furnaces and heat treatment furnaces should choose lightweight refractory bricks, ultra lightweight refractory bricks, refractory fibers and other lightweight refractory materials as much as possible to reduce heat storage and thermal conductivity losses Clay bricks and high alumina bricks are priced appropriately.
B Choose the variety of insulation materials
1 Low thermal conductivity and low density.
2 Can withstand the external surface temperature of the refractory layer of the furnace body.
C Try to determine the refractory layer and insulation layer (both collectively referred to as furnace lining) as much as possible
1. The thickness of the refractory layer should ensure that the lining has sufficient service life. If there is slag erosion in the smelting furnace, it should be thickened
2. The thickness of the refractory layer should form sufficient thermal resistance to ensure that the temperature of the insulation layer does not exceed the allowable value
3. The thickness of the insulation layer should ensure that the temperature on the outer surface of the furnace shell is not too high (generally, it is required that the temperature of the fuel furnace should not exceed 60-80 ℃, and that of the resistance furnace should not exceed 40-60 ℃).