Sulphatising roasting of a Greenlandic uranium ore, reactivity of minerals and recovery

J.K. Gamborg Hansen

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    Abstract

    Uranium in the lujavrite ore from Kvanefjeld, South Greenland, can be solubilised by sulphatising roasting at 700 °C. The reactivity of various lujavrite minerals in the roasting process and the mechanism of the reaction were investigated by X-ray diffraction, optical microscopy, electron microprobe, thermal analysis, Mossbauer and infrared spectroscopy. Soluble sulphates are formed on the surface of the grains; an outer zone of the grains is transformed; usually a core remains unchanged. Variations in uranium recovery can be explained by variations in the contents of the uranium-bearing minerals, steenstrupine and uranium-containing pigmentary material (altered Zr containing silicate minerals), and in the degree of alteration of steenstrupine. Characterization of these minerals required many qualitative and a few quantitative electron microprobe
    analyses.
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherRisø National Laboratory
    Number of pages144
    ISBN (Print)87-550-0483-0
    Publication statusPublished - 1977
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number355
    ISSN0106-2840

    Keywords

    • Risø-R-355
    • Risø-355
    • Risø report 355

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