Hydrothermal decomposition of industrial jarosite in alkaline media: the rate determining step of the process kinetics

  • Adrián Amilcare González-Ibarra CINVESTAV Unidad Saltillo
  • Fabiola Nava-Alonso CINVESTAV Unidad Saltillo
  • Juan Carlos Fuentes-Aceituno CINVESTAV Unidad Saltillo
  • Alejandro Uribe-Salas CINVESTAV Unidad Saltillo

Abstract


This work examines the role of NaOH and Ca(OH)2 on the hydrothermal decomposition of industrial jarosite deposited by a Mexican company in a tailings dam. The industrial jarosite in mainly composed by natrojarosite and contains 150 g Ag/t, showing a narrow particle size distribution, as reveled by XRD, fire assay, SEM-EDS and laser-diffraction analysis. The effect of the pH, when using NaOH or Ca(OH)2 as alkalinizing agent was studied by carrying out decomposition experiments at different pH values and 60°C in a homogeneous size particle system (pH = 8, 9, 10 and 11) and in a heterogeneous size particle system (pH = 11). Also, the kinetic study of the process and the controlling step of the decomposition reaction when NaOH and Ca(OH)2 are used was determined by fitting the data obtained to the shrinking core model for spherical particles of constant size. These results, supported by chemical (EDS), morphological (SEM) and mapping of elements (EDS) analysis of a partially reacted jarosite particle allowed to conclude that when NaOH is used, the process kinetics is controlled by the chemical reaction and when Ca(OH)2 is used, the rate determining step is changed to a diffusion control through a layer of solid products.

Published
2016/12/01
How to Cite
González-Ibarra, A. A., Nava-Alonso, F., Fuentes-Aceituno, J. C., & Uribe-Salas, A. (2016). Hydrothermal decomposition of industrial jarosite in alkaline media: the rate determining step of the process kinetics. Journal of Mining and Metallurgy, Section B: Metallurgy, 52(2), 135-142. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/8203
Issue
Vol. 52 No. 2 (2016)
Section
Original Scientific Paper

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