Hungarian journal of industrial chemistry, 1985
Vassányi, I. et al.: Examination of Changes in Phase and Chemical Composition of Pyrophyllite-lTc on Chlorination
2 I. Vassányi, S. Szabó, Mbs. Zs. Csikós and R. Jelinkó Vol. 13. Experimental The chlorination of the material was carried out in a quartz tube reactor [8]. The flow rates Va, and Fco of the chlorinating gas mixture were maintained at 12 1/h and 8 1/h, respectively. The phase analytical examinations were made with a Philips X-ray diffractometer using CuKa radiation and a crystall monochromator. To determine the chemical composition, a Philips PW 1540/10 fluorescent X-ray spectrometer and the double dilution technique [9] were used. Mass Losses of Heating and Chlorinating Experiments Samples were heated and chlorinated at 873, 973, 1123 and 1273 K, always taking a new sample. Since the material proved to be very resistant against chlorination, experiments of not only 1 hour, but of 2 or 3 hours as well were Figure 1 X-ray diffractograms of original pyrophyllite samples and of those subjected to heat treatments at different temperatures and reaction time a: original; b: 873 K, 1 hour; c: 973 K, 1 hour; d: 1123 K, 1 hour; e: 1273 K, 1 hour; /.' 1273 K, 2 hours; g: 1273 K, 3 hours; h: 1773 K, DTA examination residue