TY - RPRT
T1 - Sulphatising roasting of a Greenlandic uranium ore, reactivity of minerals and recovery
AU - Gamborg Hansen, J.K.
PY - 1977
Y1 - 1977
N2 - 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 microprobeanalyses.
AB - 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 microprobeanalyses.
KW - Risø-R-355
KW - Risø-355
KW - Risø report 355
M3 - Report
SN - 87-550-0483-0
T3 - Denmark. Forskningscenter Risoe. Risoe-R
BT - Sulphatising roasting of a Greenlandic uranium ore, reactivity of minerals and recovery
PB - Risø National Laboratory
CY - Roskilde, Denmark
ER -