Discovery of the REE minerals and its geological significance in the Quyang bauxite deposit, West Guangxi, China

Wang, Qingfei; Deng, Jun; Liu, Xuefei; Zhang, Qizuan; Sun, Silei; Jiang, Chengzhu; Zhou, Fang

doi:10.1016/j.jseaes.2010.05.005

Cited by 114 publications

(35 citation statements)

References 27 publications

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“…Cerium can occur in the oxide form as authigenic cerianite [26]. Some occurrences of REEs in bauxites are also attributed to the ion adsorption form on clay or diaspore surfaces [30]. It has also been reported that REE mineral composition can be highly variable even in bauxite samples collected a few meters apart from each other [25].…”

Section: Rees Geochemistry and Phases In Bauxitementioning

confidence: 99%

“…This list of REE minerals in bauxites is not exhaustive as there is a wide variety of REE phases described. An increasing volume of research is being published about the mineralogy of REEs in bauxite deposits worldwide in the recent years [16,[30][31][32]. An overview and a case study of the REEs geochemistry in European bauxite deposits as well as in the derived residues is given by Deady et al [15].…”

Section: Rees Geochemistry and Phases In Bauxitementioning

confidence: 99%

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Rare Earth Element Phases in Bauxite Residue

et al. 2018

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Abstract:The purpose of present work was to provide mineralogical insight into the rare earth element (REE) phases in bauxite residue to improve REE recovering technologies. Experimental work was performed by electron probe microanalysis with energy dispersive as well as wavelength dispersive spectroscopy and transmission electron microscopy. REEs are found as discrete mineral particles in bauxite residue. Their sizes range from <1 µm to about 40 µm. In bauxite residue, the most abundant REE bearing phases are light REE (LREE) ferrotitanates that form a solid solution between the phases with major compositions (REE,Ca,Na)(Ti,Fe)O 3 and (Ca,Na)(Ti,Fe)O 3 . These are secondary phases formed during the Bayer process by an in-situ transformation of the precursor bauxite LREE phases. Compared to natural systems, the indicated solid solution resembles loparite-perovskite series. LREE particles often have a calcium ferrotitanate shell surrounding them that probably hinders their solubility. Minor amount of LREE carbonate and phosphate minerals as well as manganese-associated LREE phases are also present in bauxite residue. Heavy REEs occur in the same form as in bauxites, namely as yttrium phosphates. These results show that the Bayer process has an impact on the initial REE mineralogy contained in bauxite. Bauxite residue as well as selected bauxites are potentially good sources of REEs.

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Section: Rees Geochemistry and Phases In Bauxitementioning

confidence: 99%

Section: Rees Geochemistry and Phases In Bauxitementioning

confidence: 99%

Rare Earth Element Phases in Bauxite Residue

et al. 2018

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“…These high ferrous bauxite is mainly composed of gibbsite (Al(OH) 3 ), diaspore (AlOOH), goethite (FeOOH), hematite (Fe 2 O 3 ) and kaolinite (Al 2 Si 2 O 5 (OH)4· 2H 2 O), the content of Al 2 O 3 and Fe 2 O 3 is over 65wt%, the content of SiO 2 is about 7-12wt% & Zhang et al 2014). Current studies estimate that the coal-based direct reduction method can be used to produce a high quality pig iron from low grade iron ores, and thus it is an ideal technology for adding value to marginal iron ore reserves (Kapure et al 2011& Guo et al 2013).…”

Section: Type Areamentioning

confidence: 99%

Early stage hydration properties of calcium aluminosilicate slag

Zhang¹,

Qi²,

Zou³

2016

Proceedings of the 2016 6th International Conference on Advanced Design and Manufacturing Engineering (ICADME 2016)

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ABSTRACT:The calcium aluminosilicate slag cement clinker was prepared from bauxite-coal composite pellets by high temperature reduction and smelting process. The hydration results show that, after hydration for 28 days, the hydration products of calcium aluminosilicate slag are mainly composed of killalaite (Ca3.2(H0.6Si2O7)(OH)), calcium silicate hydrate (Ca1.5SiO3.5 · xH2O) and calcium aluminates hydroxid (3CaO·Al2O3·Ca(OH)2·18·H2O, Ca12Al13.86Fe0.14(OH)2). With the increase of w(CaO)/w(SiO2) ratio, the killalaite disappeared, the 3CaO ·Al2O3·Ca(OH)2·18·H2O and Ca12Al13.86Fe0.14(OH)2 amounts were increased gradually as a function of w(CaO)/w(SiO2) ratio. The C3A and C12A7 have very exothermic hydration characteristic and faster hydration rate, promoted the hydration activity of β -C2S. The calcium aluminosilicate slag cement clinker has a higher reactivity during the early stage of the hydration process.

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“…The main conclusions of this report were as follows: (1) The large-and medium-scale deposits consist of diaspore karst accumulation-type bauxite deposits, (2) the proportion of bauxite reserves is 94.91 %, (3) the ore is of high quality, and (4) highly efficient development and use of the mine are possible. The occurrence of the rare earth element (REE) minerals parisite and churchite in the bauxite deposits was first reported by Wang et al [13].…”

Section: Introductionmentioning

confidence: 97%

“…Liu et al [9] further explored the thermal characteristics of Xinxu bauxite ore from Jingxi County, Guangxi Province, via thermogravimetric/ Electronic supplementary material The online version of this article (doi:10.1007/s10973-015-4742-6) contains supplementary material, which is available to authorized users. differential thermogravimetric (TG/DTG) analysis, and the resulting curves indicated four decomposition stages: evaporation of adsorbed water, gibbsite decomposition, goethite decomposition and diaspore dehydroxylation [13,14]. Liu et al [15] demonstrated that diaspore, hematite and kaolinite are the main mineral components in Dajia Salento-type bauxite, with lesser concentrations of anatase, chamosite, gibbsite, goethite, illite, zircon, quartz and pyrite, and that the diaspore is primarily formed under reducing conditions.…”

Section: Introductionmentioning

confidence: 99%

Mineralogical and thermal characteristics of low-grade Jinlong bauxite sourced from Guangxi Province, China

Wang

Xing

Zhang

et al. 2015

J Therm Anal Calorim

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Characteristic samples from the No. 1 ore body of the Jinlong bauxite deposit in Guangxi Province, China, were assessed to determine their chemical composition using whole-rock geochemical analysis, their mineral components using X-ray diffraction, their thermal characteristics via differential thermal analysis, thermogravimetry and differential thermogravimetry, and their dissemination characteristics by scanning electron microscopy/energydispersive spectrometry. The results show that the average Al 2 O 3 content in the Jinlong bauxite deposit is 41 % and that the Al 2 O 3 /SiO 2 ratio is approximately 2.17, and thus, the ore may be defined as low-grade bauxite. The main minerals found in the ore were diaspore (20.3-43 %), gibbsite, clays and hematite. In differential thermal analysis results, the bauxite samples exhibit two distinct endothermic peaks, with the dehydration of gibbsite occurring in the 200-260°C range and the dehydration of diaspore occurring in the 524-550°C range. Thermogravimetry and differential thermogravimetry indicate four decomposition stages: evaporation of adsorbed water (50-160°C), gibbsite decomposition (190-280°C), goethite decomposition (190-280°C) and diaspore dehydroxylation (460-580°C). The diaspore belongs to the orthorhombic dipyramidal class and exists primarily in three dissemination forms-euhedral and subhedral grain, bean and oolitic shaped, and aphanitic and microcrystalline aggregates, and is always accompanied by kaolinite and pyrophyllite.

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Discovery of the REE minerals and its geological significance in the Quyang bauxite deposit, West Guangxi, China

Cited by 114 publications

References 27 publications

Rare Earth Element Phases in Bauxite Residue

Rare Earth Element Phases in Bauxite Residue

Early stage hydration properties of calcium aluminosilicate slag

Mineralogical and thermal characteristics of low-grade Jinlong bauxite sourced from Guangxi Province, China

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