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 exponent m 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.
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