Thermal treatment of hydrated ferrous sulfate waste under different atmospheres

Abstract : Hydrated iron sulfate, especially ferrous sulfate heptahydrate (FeSO4·7H2O-melanterite), is generated by industries of titanium dioxide and surface treatment of steel. In the case of TiO2 production, the amount of FeSO4·7H2O generated can reach up to 6 tons per ton of produced TiO2 leading to huge amount of ferrous sulfate heptahydrate in the European countries which is considered as an extra cost for this industry. This work deals with the thermal treatment of ferrous sulfate (heptahydrate and monohydrate) samples under non - and isothermal conditions. Experimental tests were performed by using thermogravimetry from room temperature up to 1000 °C in oxidizing and neutral atmospheres. The dehydration of iron sulfate heptahydrate in nitrogen started from room temperature giving essentially FeSO4·4H2O. Ferrous sulfate monohydrate (FeSO4·H2O) was obtained at temperatures close to 150 °C. Whilst, the anhydrous ferrous sulfate (FeSO4) was produced when the samples are heated in nitrogen over 225 °C. Decomposition kinetic of FeSO4 into Fe2O3 was studied under isothermal conditions between 500 °C and 575 °C. The decomposition strongly depended on the temperature as it proceeded with an apparent activation energy of about 250 kJ/mol. Obtained powder iron oxide should be used as raw material in ferrous metallurgy sector.
Type de document :
Communication dans un congrès
6th International Conference on Engineering for Waste and Biomass Valorisation, 2016, Albi, France. pp.1178-1185, 2016, Proceedings of WasteEng'16
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https://hal.univ-lorraine.fr/hal-01511429
Contributeur : Ndue Kanari <>
Soumis le : vendredi 21 avril 2017 - 08:04:58
Dernière modification le : mardi 29 mai 2018 - 12:51:03

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Ndue Kanari, Noureddine Menad, Frédéric Diot, Jacques Yvon. Thermal treatment of hydrated ferrous sulfate waste under different atmospheres. 6th International Conference on Engineering for Waste and Biomass Valorisation, 2016, Albi, France. pp.1178-1185, 2016, Proceedings of WasteEng'16. 〈hal-01511429〉

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