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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/44982
Title: A kinetic study of the thermal decomposition of ammoniojarosite
Authors: Alonso Gámez, Manuel; López-Delgado, Aurora; López Gómez, Félix Antonio
Keywords: Thermal decomposition ammoniojarosite
Kinetic study
Issue Date: 1998
Publisher: Springer
Citation: Journal of Materials Science 33 (24) : 5821-5825 (1998)
Abstract: Polycrystalline powdered ammoniojarosite was obtained by hydrolysis from bio-oxidized sulphuric pickling waste water. The kinetic parameters of the thermal decomposition process of ammoniojarosite were calculated by means of thermogravimetric measurements. Analyses were performed in non-isothermal conditions at different heating rates. The three stages of the thermal decomposition process (dehydration, dehydroxylation and deammoniation, and sulphate decomposition) are best described by the Avrami–Erofeev Am model. The kinetic exponentm increases, in general, with the heating rate. Apparent activation energies of 54, 244 and 130 kJ mol¡1, respectively, were obtained for each decomposition stage. C ° 1998 Kluwer Academic Publishers
Publisher version (URL): http://dx.doi.org/10.1023/A:1004406216081
URI: http://hdl.handle.net/10261/44982
DOI: 10.1023/A:1004406216081
ISSN: 0022-2461
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