摘要
The firing tests with clay blocks were undertaken to study thefluorine expulsion and retention char- acteristics of calcium-basedmaterials during the firing of brick clays. The results indicate thatfluorine expulsion begins at approx. 600-700 deg. C, and the mainportion occurs in 800-1000 deg. C. The mode of firing has someeffects on fluorine expulsion. Additives of calcium-based materialcan reduce fluorine expulsion, which is mainly attributed to theincreased formation of CaF_2 during clay firing. In addition, theoptimum addition tests of 6 calcium-based materials with higherefficiency were carried out in a brick kiln. More than 75/100fluorine is retained in the brick body and there is no adverse effecton brick product. This makes it possible for brickyard to achievenon-polluting production.
The firing tests with clay blocks were undertaken to study the fluorine expulsion and retention characteristics of calcium-based materials during the firing of brick clays.The results indicate that fluorine expulsion begins at approx.600-700℃,and the main portion occurs in 800-1000℃. The mode of firing has some effects on fluorine expulsion.Additives of calcium-based material can reduce fluorine expulsion,which is mainly attributed to the increased formation of CaF2 during clay firing.In addition,the optimum addition tests of 6 calcium-based materials with higher efficiency were carried out in a brick kiln.More than 75% fluorine is retained in the brick body and there is no adverse effect on brick product.This makes it possible for brickyard to achieve non-polluting production.
