Abstract
The thermal decomposition reaction of siderite mineral samples in water vapour/nitrogen atmospheres was studied using thermogravimetry. A reduction of about 120 °C in the decomposition temperature in 60 kPa water vapour, compared to that in nitrogen, was found for both siderite and ferroan magnesite. A different reaction mechanism in water vapour accounts for the differences in temperature. The effect of water vapour pressure between 0 and 80 kPa was non-linear, being relatively greater at low vapour pressures, and the inverse relationship between the peak decomposition temperature and water vapour pressure has been established. The results imply that the siderites and magnesian siderites present in Australian Tertiary oil shales will decompose during steam-retorting, although the possible countervailing effect of carbon dioxide remains to be defined.
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