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Embossed brick
09-03
High internal combustion and coal gangue bricks often have blue-black scars at the stacking of the two blanks, sometimes the black scars are slightly depressed, called embossing. It is caused by anoxic combustion at the superposition, and the ferric oxide in the mud is reduced to blue black ferrous oxide. Because ferrous oxide has strong fluxing ability to clay, roasting causes shrinkage to form depression, but does not affect its strength. Therefore, the internal heat of the brick can not be too high. For coal gangue bricks with high internal combustion, the code kiln form of paperback code can be adopted to transfer embossing to the large surface that does not affect the appearance of masonry. Strengthen sand scattering during molding so that a certain amount of air can flow through the laminated surface; Dry billet enters the kiln to prevent upper and lower brick billets"Embossing adhesion"; roasting using low temperature long burning, as far as possible fully oxidized, reduce embossing.
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