Investigation of the dehydration process of iron(II) sulfate heptahydrate by filtration method

Abstract

The filtration method of dehydrating iron(II) sulfate heptahydrate was proposed to involve the formed compounds in the production process of fabrication of iron oxide pigments. Using the method of complex thermal analysis, the influence of the heating rate on the temperature limits and the intensity of the dehydration process was revealed. Based on the results of the differential thermal analysis, the heat agent temperature was chosen to be 3350.5 K, which is lower than the melting point of the sample. The effects of increasing the speed of the heat agent on the kinetics of dehydration of iron(II) sulfate heptahydrate by the filtration method and on the intensity of the heat exchange process were determined. The values of the heat transfer coefficients were calculated based on experimental data in a thin layer and from the calculated dependence. The calculated coefficients were generalized using a dimensionless dependence within the range of Reynolds numbers of 20 to 100. The equation for forecasting heat energy costs at the stage of designing equipment for dehydration was proposed.