Other
Scientific paper
Jul 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..19..168s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 19, Issue 3, pp.168-176
Other
Scientific paper
The uranyl fluoride content of fully hydrofluorinated uranium oxides, whether pure or mixed with the oxides of a number of other metals, is a practical measure of the original U VI content. This observation forms the basis for determining the oxidation state of pitchblende when more precise methods are inapplicable. Metallic and carbonaceous contamination must be absent, and the sulphide content of the ore must be reduced to the level of a few per cent relative to the uranium content, by means of oredressing techniques. The method involves reacting the finely ground concentrate to constant weight with anhydrous hydrogen fluoride gas at a maximum temperature of 35°C in a thermobalance modified for work with corrosive gases. Uranyl fluoride is leached from the product with cold saturated aqueous sodium fluoride, and uranium tetrafluoride is dissolved from the residue with hot ammonium oxalate solution. In each case, the extracted uranium is determined either spectrophotometrically or fluorimetrically. Application to problematical ores other than pitchblende, such as davidite, is envisaged.
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