an investigation into the phase formation during calcination of kaolin and calcite mixture

in this research, the effects of temperature, time and grinding on the types of phases in the calcined kaolin and calcite mixture was investigated. differential thermal analysis (dta) and x-ray diffraction of samples showed that gehlenite is formed at 990 ˚c as the main phase which transforms into anorthite with an increase in the temperature to 1200 ˚c. after grinding the mixture and with increasing the grinding time at the calcination temperature of 900 ˚c, anorthite was recognized to be the main phase.