The kinetics of the oxidation of iron(II) by chlorate in the leaching of uranium ores

Hajime Miki, Michael Nicol

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The oxidation of iron(II) is an essential step in the oxidative leaching of uranium(IV) minerals such as uraninite and one of the reagents used in practice for this oxidation is sodium chlorate. This paper presents the results of an investigation into the kinetics of the oxidation of iron(II) by chlorate in solutions typical of the leaching of uranium. The results have confirmed the known form of the rate equation which is first-order in each of iron(II), chlorate and acid concentration. An overall rate equation has been derived which can be used to model the rate of iron(II) oxidation as a function of the reactant concentrations and the temperature. The half-life was found to be less than 1 min under typical leach conditions at the Olympic Dam operation in South Australia and this species cannot be considered to be the direct oxidant for uranium(IV) minerals.

Original languageEnglish
Pages (from-to)47-49
Number of pages3
JournalHydrometallurgy
Volume100
Issue number1-2
DOIs
Publication statusPublished - Jan 1 2009
Externally publishedYes

Fingerprint

Chlorates
Uranium
Ores
Leaching
Iron
Oxidation
Kinetics
Minerals
Oxidants
Dams
Sodium
Acids
Temperature

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering
  • Materials Chemistry
  • Metals and Alloys

Cite this

The kinetics of the oxidation of iron(II) by chlorate in the leaching of uranium ores. / Miki, Hajime; Nicol, Michael.

In: Hydrometallurgy, Vol. 100, No. 1-2, 01.01.2009, p. 47-49.

Research output: Contribution to journalArticle

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