Abstract

MORALES, Graciela V; QUIROGA, Oscar D  and  TOLABA, Ebelia N. Kinetics Modeling of Hydroboracite Dissolution in Hydrochloric Acid. Inf. tecnol. [online]. 2010, vol.21, n.5, pp.21-26. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642010000500004.

The kinetics modeling of hydroboracite in hydrochloric acid solutions was developed. The dissolution was carried out in a batch reactor at atmospheric pressure. The effects of the temperature, particle size, solid/liquid ratio and concentration of the solution on the dissolution rate were investigated. It was found that the dissolution rate is always very fast, increases with increasing reaction temperature and with decreasing particle size, and decreases with an increase in the solid/liquid ratio. The experimental data were analyzed with different kinetics models presented in literature, for fluid-solid reactive transformations. It was determined that the dissolution rate fit to the diffusive control model, with activation energy of 13.48 KJ/mol.

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

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