Clay brick appear “black” or “red” reasons

Clay brick firing, sometimes a “black” or “red” waste. The reason there is no consensus clear. That is due to lack of oxidizing atmosphere, and firing caused by excessive. Brick kiln firing process, if the lack of organic matter oxidation atmosphere, the brick at the beginning beforesintering to oxidation burn, will make the sintering products inside showed different degrees of black, red. In addition, iron, titanium impurities contained in the brick, in the original fast atmosphere, reducing from high valence oxide into low oxide, also can make the products inside is black or brown green. When the firebrick appear after firing this kind of situation, often used in the production of: enhanced oxidation atmosphere in the kiln, to keep the adobe oxidizing atmosphere longer and give a full 600 to 1000 DEG C; or adjust the kiln method, increase tile surface oxidized area, make direct contact with the flame of the green area increases, improve the effect of oxidation.