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Información tecnológica

On-line version ISSN 0718-0764


MORALES, Graciela V  and  QUIROGA, Oscar D. Dissolution Kinetics of Hydroboracite in Hydrochloric Acid and Sulphuric Acid Solutions. Inf. tecnol. [online]. 2008, vol.19, n.3, pp.7-12. ISSN 0718-0764.

The dissolution kinetics of hydroboracite in hydrochloric acid and sulphuric acid solutions was investigated. The experiments were carried out in a steel batch reactor equipped with a mechanical stirrer, at atmospheric pressure. The effect of reaction temperature, particle size, solid/liquid ratio and acid concentration on the dissolution rate was determined. It was found that the dissolution rate increased with increasing the acid concentration and reaction temperature. However, the increase of particle size and solid/liquid ratio decreased the dissolution rate. The activation energy for the hydroboracite dissolution in hydrochloric acid was calculated as 44.9 kJ/mol, which does not permit to know the process controlling step. The activation energy for the hydroboracite dissolution in sulphuric acid was found to be 14.6 kJ/mol, which indicates that the dissolution is a diffusion controlled process.

Keywords : hydroboracite; boric acid; dissolution kinetics; kinetics studies.

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