Mullite poly light bricks are known to be used in the insulation layer to play a role in heat preservation and energy saving; however, for furnace linings with low erosion, they can be used in the working layer (that is, the area directly exposed to the flame).
JM23, 26, 28, 30, 32, for neutral furnace linings, can all be used in direct contact with flames, especially JM30 and 32 bricks, which, like alumina hollow ball bricks, can be used in high temperature sections, and they themselves play a role in heat preservation. They are light in weight and are used in light kilns for better results.
Currently, the bricks used in the insulation layer on the market are clay light bricks and high-alumina light bricks. The most commonly used insulation layer bricks are clay light bricks, because the thermal conductivity of light bricks and poly light mullite bricks is not much different. As long as the light bricks of suitable material density are selected at the appropriate temperature, it can be used.
Polylight mullite bricks are high-end insulation materials, and when the furnace temperature is high, polylight mullite bricks with different body densities and different use temperatures can be used to save energy. In some special furnace linings, especially when the furnace temperature outside the furnace is low, mullite polylight bricks can be used for the insulation layer and the bricks directly in contact with the flame layer.
However, polylight bricks are not suitable for the working layer of some strong acid and strong alkali furnace linings, because the strength of polylight bricks is not strong under high erosion, and the corrosive slag will corrode the polylight bricks, but alumina hollow ball bricks can also be used.
According to the current market usage, mullite polylight bricks are mostly used in the insulation layer. When the temperature outside the furnace shell is low and the temperature and environment are suitable, mullite polylight bricks can be used, or multi-layer masonry can be used. JM23 is used close to the furnace shell, and JM28, 30, and 32 can be used at the flame.
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