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Leaching of coarse caliche ore. Experiment and modelling
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Engineering.
2016 (English)In: Brazilian journal of chemical engineering, ISSN 0104-6632, E-ISSN 1678-4383, Vol. 33, no 1, 105-114 p.Article in journal (Refereed) Published
Abstract [en]

Heap leaching of caliche ores is frequently performed with run-of-mine (ROM) material, which includes rocks of very different sizes; however, most of the experimental data are obtained using small particles. To contribute to the understanding of caliche leaching, an experiment using coarse particles was carried out. The recoveries obtained from this experiment were compared with those observed in the leaching of fine particles and, as expected, a larger volume of leachant was required for leaching coarse particles to reach the same recovery. For the highly soluble species nitrate, the recovery was modelled using a previously developed model, obtaining good agreement without any fitting by using only the mass transfer coefficient obtained, by fitting, from fine particle leaching data in previous works. Physical properties such as permeability and capillarity were determined, showing that capillary forces are large, but that the permeability is very small, implying that flow through caliche particles should be very small.

Place, publisher, year, edition, pages
Assoc. Brasiliera de Eng. Quimica , 2016. Vol. 33, no 1, 105-114 p.
Keyword [en]
Nitrate, Physical properties, Column leaching, Particle size effect, Phenomenological model
National Category
Other Chemistry Topics
URN: urn:nbn:se:kth:diva-192417DOI: 10.1590/0104-6632.20160331s20140078ISI: 000380812800009ScopusID: 2-s2.0-84982823027OAI: diva2:968706

QC 20160912

Available from: 2016-09-12 Created: 2016-09-12 Last updated: 2016-09-12Bibliographically approved

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Moreno, Luis
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