Beside fireclay,the other raw materials such as shale,gangue,fly ash could also be used for square runner bricks production.Although they are similar in chemicals with fireclay, they need to be combined with fireclay for brick production due to lower plasticity. In addition, the gangue and fly ash in the brick are flammable industrial waste containing cabon residue. They will burn inside the brick when calcination which helps save coal consumption volume. As a result,these type of bricks are also called Inner flammable bricks and semi-inner flammable bricks.
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