Chemical and microstructural characterisation studies on natural and heat treated brannerite samples

Charalambous, Fiona; Ram, Rahul; Pownceby, Mark I.; Tardio, James; Bhargava, Suresh K.

doi:10.1016/j.mineng.2012.08.006

Cited by 26 publications

(25 citation statements)

References 23 publications

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“…Similar to brannerite from Roxby Downs and Crocker Well (both in South Australia) (Charalambous et al, 2012), the Witwatersrand, South Africa (Smits, 1984) among other localities, fine-grained, sometimes nanoscale, anatase is a dominant TiO 2 polymorph associated with brannerite ( Figure 2).…”

Section: Relevant Properties Of the Feed Mineralsmentioning

confidence: 85%

“…Titanium oxides are the most common alteration products of brannerite under oxidizing natural conditions (Charalambous et al, 2012;Lumpkin et al, 2012). reported by Smits (1984) for metamict brannerite of a hydrothermal origin from the Witwatersrand in South Africa, which was intersected by cracks filled with anatase associated with quartz and anglesite.…”

Section: Relevant Properties Of the Feed Mineralsmentioning

confidence: 97%

“…3 crystal lattice have been related to enhanced reactivity of altered brannerite compared with unaltered material (Charalambous et al, 2012). Ifill et al, (1996) observed a relationship between the texture of a brannerite grain within ore and the rate at which it dissolved, with the presence of secondary coffinite facilitating the formation of leached pits on the brannerite surface.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Most natural specimens of brannerite are XRD amorphous (Pabst, 1954;Feather and Koen, 1975;Theis, 1979;Burns, 1999;Finch and Murakami, 1999;Charalambous et al, 2012). The XRD analyses of brannerite from Sierra Albarrana revealed that the large volume of the sample is also amorphous (Figure 2).…”

Section: Relevant Properties Of the Feed Mineralsmentioning

confidence: 99%

“…reported by Smits (1984) for metamict brannerite of a hydrothermal origin from the Witwatersrand in South Africa, which was intersected by cracks filled with anatase associated with quartz and anglesite. Altered areas of brannerite from several locations were enriched in aluminium, silicon and phosphorus and depleted in uranium and calcium relative to titanium (Zhang et al, 2006;Charalambous et al, 2012;Lumpkin et al, 2012). Lumpkin et al, (2012) proposed the mechanism of brannerite alteration where uranium dissolves as uranyl ions, followed by precipitation of a secondary titanium oxide phase.…”

Section: Relevant Properties Of the Feed Mineralsmentioning

confidence: 99%

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Leaching of brannerite in the ferric sulphate system. Part 2: Mineralogical transformations during leaching

2016

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractBrannerite, UTi 2 O 6 , is the most common refractory uranium mineral and is the most important uranium ore mineral after uraninite and coffinite. In order to develop an effective treatment method for the hydrometallurgical extraction of uranium from ores containing brannerite, it is necessary to understand the chemistry of the leaching process. Part 1 of this series described the results of a study of the chemical reaction mechanisms of brannerite under conditions similar to those used industrially. In this paper, the mineralogical data obtained from samples collected during the leaching work is used to derive further insight into the transformations that take place during leaching. Detailed characterisation of the brannerite feed specimen and leach residues were carried out using surface imaging and X-ray diffraction techniques. It was shown that the brannerite specimen is heterogeneous, consisting of at least two phases. The brannerite phase was metamict and showed signs of natural alteration to fine-grained (10-20 nm) crystalline anatase. Comparisons between the feed and residues showed that the X-ray amorphous material, in particular lead and silicon enriched areas identified near the anatase were most susceptible to leaching while the crystalline material was relatively resistant to leaching. These results demonstrate that the extent of brannerite alteration and its texture are important considerations to the hydrometallurgical behaviour of a particular ore along with the typical concerns such as grade, liberation size and gangue mineralogy.

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Section: Relevant Properties Of the Feed Mineralsmentioning

confidence: 85%

Section: Relevant Properties Of the Feed Mineralsmentioning

confidence: 97%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Relevant Properties Of the Feed Mineralsmentioning

confidence: 99%