Microwave digestion of zircon with ammonium acid fluoride: derivation of kinetic parameters from non-isothermal reaction data

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dc.contributor.author Nhlabathi, T.N.
dc.contributor.author Nel, J.T.
dc.contributor.author Puts, Gerard Jacobs
dc.contributor.author Crouse, Philippus L.
dc.date.accessioned 2013-07-02T13:35:03Z
dc.date.available 2013-07-02T13:35:03Z
dc.date.issued 2012-11-21
dc.description.abstract Zircon is notoriously inert. Aggressive processing methods such as alkaline fusion are conventionally used to extract zirconium values from the mineral. In this study results are presented with respect to microwave digestion of zircon using ammonium acid fluoride (NH4F·1.5HF). Two distinct experimental methods were used. In the first method the reaction was followed in the temperature range of 100 to 200 °C, for a full reaction period of 60 min at each temperature. The secondmethod comprised successive digestion periods interrupted bywashing and re-introduction of fresh acid fluoride at a series of reaction temperatures varying between 120 and 240 °C. Complete digestion was achieved with the latter technique. The kinetics is shown to be controlled by product-layer diffusion. The two data sets were combined to derive consistent temperature-dependent kinetic parameters. A facile numerical technique for extracting these parameters from the experimental data is used. en_US
dc.description.librarian hb2013 en_US
dc.description.sponsorship The Advanced Metals Initiative of the Department of Science and Technology of South Africa. en_US
dc.description.uri http://www.elsevier.com/locate/ijimpro en_US
dc.identifier.citation Nhlabathi, TN, Nel, JT, Puts, GJ & Crouse, PL 2012, 'Microwave digestion of zircon with ammonium acid fluoride: derivation of kinetic parameters from non-isothermal reaction data', International Journal of Mineral Processing, vol. 114-117, no. 11, pp. 35-39. en_US
dc.identifier.issn 0301-7516 (print)
dc.identifier.issn 1879-3525 (online)
dc.identifier.other /10.1016/j.minpro.2012.09.002
dc.identifier.uri http://hdl.handle.net/2263/21783
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.rights © 2013 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in International journal of Mineral Processing.Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International journal of Mineral Processing, vol.114-117, no. 11, 2012. DOI : 10.1016/j.minpro.2012.09.002 en_US
dc.subject Zircon en_US
dc.subject Microwave digestion en_US
dc.subject Ammonium acid fluoride en_US
dc.subject Kinetics en_US
dc.title Microwave digestion of zircon with ammonium acid fluoride: derivation of kinetic parameters from non-isothermal reaction data en_US
dc.type Postprint Article en_US


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