Kinetics of dehydration of FeSO4.7H2O under different atmospheres

International audience; Hydrated ferrous sulfate is a by-product of titanium and surface treatment industries. The majority of this product has to be disposed as a waste. Disposal is a significant extra cost for these industries. Recently, the ferrous sulfate partially dehydrated was successfully used for the synthesis of a new superoxidant material containing iron in hexavalent state (Fe-VI).The kinetics of dehydration of FeSO4. 7H2O under neutral, oxidizing and chlorinating atmospheres were studied by thermogravimetric and differential scanning calorimetry analysis. The obtained products were analyzed by X-ray diffraction and Mossbauer spectroscopy. The effects of temperature, gas velocity, type of sulfate, etc, on the dehydration rate were defined.