Cinética de la disolución de ulexita calcinada en soluciones de sulfato de amonio

Nizamettin Demirkıran; Mehmet Kayra Tanaydin; G. Deniz Turhan Özdemir

doi:10.3989/revmetalm.112

Authors

Nizamettin Demirkıran Department of Chemical Engineering, Faculty of Engineering, Inönü University https://orcid.org/0000-0001-9021-2477
Mehmet Kayra Tanaydin Department of Chemical Engineering, Faculty of Engineering, Tunceli University https://orcid.org/0000-0003-1696-0754
G. Deniz Turhan Özdemir Department of Chemical Engineering, Faculty of Engineering, Inönü University https://orcid.org/0000-0003-4749-1989

DOI:

https://doi.org/10.3989/revmetalm.112

Keywords:

Ammonium sulfate, Dehydration, Dissolution kinetics, Ulexite

Abstract

Ulexite is one of the boron minerals, which include a respectable amount of hydration water. It can be used as a raw material in the production of boron compounds. Some part of water in the composition of ulexite can be removed from the solid matrix applying dehydration treatment, and a porous structure can be obtained to increase the reaction rate. In the present study, the effect of dehydration temperature on dissolution kinetics of ulexite in ammonium sulfate solutions was researched in a batch reactor utilizing the parameters of solution concentration, solid-to-liquid ratio, stirring speed and reaction temperature. It was determined that the dissolution rate of calcined material increased with increasing solution concentration and reaction temperature and with decreasing solid-to-liquid ratio. The highest dissolution rate was attained with the sample calcined at 150 °C. It was found that the dissolution rate fit to the first order pseudo-homogeneous model. The activation energy of the dissolution process was estimated to be 42 kJ·mol^-1.

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