Q. Describe Fire clay and Kaolinite Binders?
Fire clay: Fire clay is refractory clay usually found in the coal measures.
Kaolinite: Its general composition is al2o3 . 2sio2. 2H2o. It is one of the decomposition products of slow weathering of graphite and basalt. It is main constituent of china fire clay. Its melting point is 1750 to 17870c
Illite: This clay has approximate composition. K2O.Al2o3.Sio2.H2O. it is formed from the weathering of mica rocks. Its particle size is about the same as the kaolinite clay and has similar moulding properties.