Brannerite, a new uranium mineral

Hess, Frank L.; Wells, Roger C.

doi:10.1016/s0016-0032(20)91588-0

Cited by 24 publications

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“…The sample originates from the Dieresis deposit, near Cordoba, Spain and was coated in a white-pale yellow/brown alteration layer similar to the description given by Hess and Wells (1920). X-ray diffraction analyses by Costine et al (2013) have shown that the alteration layer consisted of anatase.…”

Section: Feed Samplementioning

confidence: 88%

“…In the first published description of brannerite, Hess and Wells (1920) describe brannerite crystals from Custer County, Idaho, USA as brownish yellow on the outside with an opaque black interior. The outer weathered layer was of a similar or lesser thickness to a sheet of paper, while the inside was filled with minute cracks, containing quartz.…”

Section: Feed Samplementioning

confidence: 99%

“…The outer weathered layer was of a similar or lesser thickness to a sheet of paper, while the inside was filled with minute cracks, containing quartz. The mineral had a dark greenish brown streak (Hess and Wells, 1920). The material used in the experiments in the present study was a sample of a 100 g single crystal (Fig.…”

Section: Feed Samplementioning

confidence: 99%

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Leaching of brannerite in the ferric sulphate system — Part 1: Kinetics and reaction mechanisms

Gilligan

Nikoloski

2015

Hydrometallurgy

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The uranium titanate mineral brannerite, UTi2O6 is the most common of the uranium minerals which is considered refractory. Ore containing brannerite mineralisation has been mined and processed in several locations around the world. Under typical uranium ore processing conditions, brannerite is often lost to tailings. In order to design an effective process for the leaching of high-brannerite uranium ores, it is first necessary to understand the mechanism of the chemical processes through which brannerite dissolves in the absence of interferences from the host rock. In the present study, a specimen of brannerite obtained as a single crystal was leached in sulphuric acid (10-200 g/L) and ferric sulphate (2.8 g/L Fe 3 + ) solution at 25-96 °C for 5 h. The rate of titanium dissolution was monitored along with uranium. Comparisons between the rates at which these two elements dissolved and the morphological changes that were observed to take place during the dissolution process indicated two different sets of leaching reaction mechanisms. At low temperatures, uranium dissolved at a much higher rate than titanium initially, leaving titanium rich areas on the brannerite particles similar to observations reported in earlier investigations which suggest incongruent dissolution. The calculated activation energies for uranium and titanium dissolution were 36 and 48 kJ/mol respectively. At higher temperatures, uranium and titanium dissolved at similar rates in constant proportions suggesting congruent dissolution. The calculated activation energy for this reaction was 23 kJ/mol. The transition between incongruent and congruent dissolution took place at lower temperatures when the acid concentration was higher. Titanium appeared to undergo hydrolysis after dissolution, forming anatase. This side reaction was most favourable at lower acid concentrations and high temperatures.

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Section: Feed Samplementioning

confidence: 88%

Section: Feed Samplementioning

confidence: 99%

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Leaching of brannerite in the ferric sulphate system — Part 1: Kinetics and reaction mechanisms

Gilligan

Nikoloski

2015

Hydrometallurgy

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“…Natural brannerite, ideally UTi 2 O 6 , is an important accessory phase in uranium mineral ores and is mined as the principal ore mineral in some localities [7]. Natural specimens of UTi 2 O 6 exhibit chemical flexibility, with significant substitution of Pb, Ca, Th, Ln, on the U site, and Si, Al, Fe on the Ti site, commonly observed (Ln¼lanthanide) [7][8][9][10][11][12][13][14][15]. Closely related synthetic solid solutions, incorporating pentavalent uranium, have also been described by several authors [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and non-stoichiometry of cerium brannerite: Ce0.975Ti2O5.95

Stennett

Freeman

Gandy

et al. 2012

Journal of Solid State Chemistry

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“…The observed forms and measurements for the California crystals are given in the table below. The Idaho material had earlier been considered by Hess and Wells (1920) to be an isometric paramorph after a tetragonal or orthorhombic species, and considered the mineral to be monoclinic from visual inspection of large rough crystals from Fuenteovejuna, Spain. Brannerite is metamict, and X-ray single-crystal data are lacking.…”

Section: Compositionmentioning

confidence: 99%

Systematic mineralogy of uranium and thorium

1958

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Brannerite, a new uranium mineral

Cited by 24 publications

References 0 publications

Leaching of brannerite in the ferric sulphate system — Part 1: Kinetics and reaction mechanisms

Leaching of brannerite in the ferric sulphate system — Part 1: Kinetics and reaction mechanisms

Crystal structure and non-stoichiometry of cerium brannerite: Ce0.975Ti2O5.95

Systematic mineralogy of uranium and thorium

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