CaCl2的高温稳定性试验研究

The stability of CaCl2 in dry and moist air at elevated temperatures were studied by direct absorption of gaseous chlorides and mercury thiocyanate measurements technique supplemented by chemical analysis (pyrohydrolysis- mercury thiocyanate method) and flame atomic absorption spectrometer (FAAS). The principal reaction is shown to be hydrolysis of CaCl2 at high temperature and CaCl2 is actually hydrolyzed appreciably at about 700 ℃ in moist atmospheres. Kinetics calculation has shown that hydrolysis is two order reaction and the activation energy for the hydrolysis is 37.82 kJ/mol and 18.13 kJ/mol, over the range 700 ℃～1 000 ℃ and 1000℃～1300℃. The results will be of significance for chloride pollution control during coal combustion.