Leaching kinetics of natural cobalt triarsenide in chlorine solutions
Identifieur interne : 001698 ( Main/Exploration ); précédent : 001697; suivant : 001699Leaching kinetics of natural cobalt triarsenide in chlorine solutions
Auteurs : J. Vi Als [Espagne] ; J. Oliveras [Espagne] ; C. Nú Ez [Espagne]Source :
- Metallurgical Transactions B [ 0360-2141 ] ; 1986-12-01.
Abstract
Abstract: The influence of stirring speed, particle size, chlorine and hydrochloric acid concentrations, and temperature on the kinetics of chlorine leaching of skutterudite particles in a stirred vessel has been investigated. The reaction rate is limited by transport in the aqueous phase with significant resistance of the chemical reaction at temperatures below 20 °C. This is supported by (a) the rate constant increases with decrease in particle size, (b) the first-order dependence of the leaching rate with the total chlorine concentration and the insignificant effect of the hydrochloric acid concentration, (c) an apparent activation energy of 18 kJ/mole for transport control and an approximate value of 85 kJ/mole for the chemical reaction, and (d) the agreement of the experimental transport constants with the expected values for mass transfer coefficients. The reaction kinetics were analyzed by a shrinking core model in which [(Sh) p − 2] (D/d) was considered virtually independent of particle size, which is consistent with the experimental data.
Url:
DOI: 10.1007/BF02657125
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Vi Als</name><affiliation wicri:level="3"><country xml:lang="fr">Espagne</country><wicri:regionArea>Department of Metallurgy, University of Barcelona, Avda. Diagonal 647, 08028, Barcelona</wicri:regionArea><placeName><settlement type="city">Barcelone</settlement><region nuts="2" type="region">Catalogne</region></placeName></affiliation></author><author><name sortKey="Oliveras, J" sort="Oliveras, J" uniqKey="Oliveras J" first="J." last="Oliveras">J. Oliveras</name><affiliation wicri:level="3"><country xml:lang="fr">Espagne</country><wicri:regionArea>Department of Metallurgy, University of Barcelona, Avda. Diagonal 647, 08028, Barcelona</wicri:regionArea><placeName><settlement type="city">Barcelone</settlement><region nuts="2" type="region">Catalogne</region></placeName></affiliation></author><author><name sortKey="Nu Ez, C" sort="Nu Ez, C" uniqKey="Nu Ez C" first="C." last="Nú Ez">C. 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The reaction rate is limited by transport in the aqueous phase with significant resistance of the chemical reaction at temperatures below 20 °C. This is supported by (a) the rate constant increases with decrease in particle size, (b) the first-order dependence of the leaching rate with the total chlorine concentration and the insignificant effect of the hydrochloric acid concentration, (c) an apparent activation energy of 18 kJ/mole for transport control and an approximate value of 85 kJ/mole for the chemical reaction, and (d) the agreement of the experimental transport constants with the expected values for mass transfer coefficients. The reaction kinetics were analyzed by a shrinking core model in which [(Sh) p − 2] (D/d) was considered virtually independent of particle size, which is consistent with the experimental data.</div></front></TEI><affiliations><list><country><li>Espagne</li></country><region><li>Catalogne</li></region><settlement><li>Barcelone</li></settlement></list><tree><country name="Espagne"><region name="Catalogne"><name sortKey="Vi Als, J" sort="Vi Als, J" uniqKey="Vi Als J" first="J." last="Vi Als">J. Vi Als</name></region><name sortKey="Nu Ez, C" sort="Nu Ez, C" uniqKey="Nu Ez C" first="C." last="Nú Ez">C. Nú Ez</name><name sortKey="Oliveras, J" sort="Oliveras, J" uniqKey="Oliveras J" first="J." last="Oliveras">J. Oliveras</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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