Automated Quantitative Characterization REE Ore Mineralogy …
The giant carbonatite-related Bayan Obo deposit contributes most REE resources in the world's market, while its origin is still unclear because of the complicated and diverse REE ore mineralogy ...
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Process mineralogy of Bayan Obo rare earth ore by MLA
More than 70%shares of the light rare earth productsare provided by the Bayan Obo deposit (Weng et al., 2015; J. Zhang, 2005; Zhou et al., 2019). Bayan Obo, world-class reserves of rare-earth elements, situated in Inner Mongolia on the northern edge of the Paleoproterozoic-Archean North China craton, which is one of the oldest cratons on Earth
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Anomalous abundance and redistribution patterns of rare
The Bayan Obo Mine, the largest rare earth element (REE) deposit ever found in the world, has been mined for nearly 60 years for iron and rare earth elements. To assess the influences of mining activities on geochemical behavior of REEs in soils, 27 surface soil samples and three soil profile samples were collected from different …
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Kinetics of Reduction in Stages of Pellets Prepared from the Bayan Obo
The Bayan Obo iron ore concentrate and bentonite are ground below 0.074 mm, respectively, and put into a WGL-30B electric thermostatic drying oven at 473.15 K for 90 min. Then, the dried mineral powder and bentonite are put into a mixing tank at a ratio of 97:3 and mixed for 60 min. After the raw materials are mixed, the electric thermostatic ...
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Ej Atlas
China now hosts 36% of the world's total REE reserve base, and the Chinese REE production accounted for 63% of the total world production in 2019 [10]. 80% of the REE reserves in China are distributed in the Bayan Obo region, Inner Mongolia, Northern China .The Bayan Obo open-pit mine contained approximately 1.4 billion tons of iron, 1 …
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Iron isotope fractionation during fenitization: a case study of
For the studied Bayan Obo fenites, it is observed that the dominated Fe-bearing minerals are silicates but Fe oxide mineral tends to occur for more weakly fenitized rocks (Fig. 1 and Le Bas 2008), indicating the increase of Fe 3+ /Fe tot ratio or oxygen fugacity in fenites far away from the contact. Such a trend has also been reported in other ...
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The formation of the ore-bearing dolomite marble from the …
south and east of Bayan Obo deposit. These magmatic rocks were formed in a post-collisional tectonic regime during clo-sure of the Paleo-Asian Ocean (Fig. 1; Fan et al. 2016). The ore host rock is traditionally assigned to the dolomite marble unit H8, which is overlain by H9 K-rich slate. The Bayan Obo deposit is located at the center of the ...
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Minerals | Free Full-Text | The Distribution Regularity and …
The characteristics of Baiyun Obo niobium-bearing minerals are complex physicochemical properties that make the beneficiation of niobium minerals extremely difficult. In this paper, X-ray diffraction, X-ray fluorescence and mineral liberation analyzer (MLA) systems were used to study the niobium occurrence state and distribution of …
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Mineralization of the Bayan Obo Rare Earth Element Deposit by
The genesis of the Bayan Obo giant rare earth element (REE) deposit has been debated for several decades. Here, we report the isotopic effects of dynamic …
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REE daughter minerals trapped in fluid inclusions in the Giant Bayan
The Bayan Obo REE-Nb-Fe deposit with giant rare earth reserves, still has no unified understanding of the REE and Nb-bearing mineral evolution and the division of mineralization stages, due to the ...
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Identification of ~1.3 Ga hydrothermal zircon from the giant Bayan Obo
The Bayan Obo deposit. Bayan Obo was first discovered as an iron deposit in 1927 and later recognized as a world-class REE and Nb deposit. This deposit contains 57.4 Mt at 6% REE 2 O 3, 2.2 Mt at 0.13 wt% Nb 2 O 3, and 1500 Mt at 35 wt% Fe (Fan et al., 2016). The Bayan Obo deposit locates in the northern margin of the North China …
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Bayan Obo world biggest rare earths mine, Baotou, Inner …
China now hosts 36% of the world's total REE reserve base, and the Chinese REE production accounted for 63% of the total world production in 2019 [10]. 80% of the REE reserves in China are distributed in the Bayan Obo region, Inner Mongolia, Northern China .The Bayan Obo open-pit mine contained approximately 1.4 billion tons of iron, 1 …
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Thermodynamic Constraints on REE Mineral Paragenesis in the Bayan Obo
The Bayan Obo REE-Nb-Fe deposit is a typical carbonatite-related deposit, which indicates the rare earth element (REE) resources originated from local carbonatite magma [1,2].However, there is still controversy about whether the abnormal REE enrichment was initiated during the intrusion of dolomitic carbonatite melt, or during …
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Natural Advantages of Preparation of Composites from Minerals
Fe-Al 2 O 3 composites were prepared by pressureless sintering, using Bayan Obo iron concentrate and bauxite as the main raw materials, activated carbon was added as the reducing agent. The effects of different bauxite additions on the phase composition, microstructures, mechanical properties, and the corrosion-resistance were …
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New evidence from a calcite-dolomite carbonatite dyke for
New data on Sr and Nd isotope composition and major and trace element distribution in dolomite-calcite carbonatite dykes at Bayan Obo are provided, and a Mid-Proterozoic age is deduced. The dykes and the neighbouring massive dolomite (H8) body have similar geochemical characteristics, interpreted to indicate a carbonatitic magmatic …
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(PDF) Geological features and genesis of the Bayan …
PDF | Geotectonically, the Bayan Obo deposit is located on the northern margin of the North China platform. When the Proterozoic …
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Occurrence State and Distribution Regularity of Key Metal
The Bayan Obo district is located at the northern margin of the North China Craton, bordering the Central Asian Orogenic Belt (Fig. 1a). 12,19,20 The ore district is 16 km long from east to west and 3 km wide from north to south, with a total area of about 48 km 2. 21 According to the boundary grade of iron, the Bayan Obo deposit is composed …
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(PDF) Genesis of the world's largest rare earth element deposit, Bayan
The Bayan Obo Fe-REE-Nb deposit is the largest rare earth deposit in the world, which also contains huge amounts of niobium resources, hosting 83% of industrial reserves in China.
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Boom in Mining Rare Earths Poses Mounting Toxic Risks
Bayan-Obo, China's largest rare earths project, has been operating for more than four decades. According to the Germany-based Institute for Applied Ecology, the site now has an 11-square-kilometer waste pond — about three times the size of New York City's Central Park — with toxic sludge that contains elevated concentrations of thorium.
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PART I. THE BAYAN OBO ORE DEPOSIT
The Bayan Obo mine area is about 100 km south of the suture marking Caledonian subduction (fig. 4; Wang, 1985) that took place at the northern edge of the North China Platform or craton. A small granitic intrusion of Caledonian age occurs in the Hejao area, south of Bayan Obo (fig. 1). No direct evidence of rifting involving the Bayan Obo Group ...
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Constraints and insights into the tectonics of the Bayan Obo …
ABSTRACT. The Bayan Obo deposit in Inner Mongolia is a crucial source of rare earth elements-niobium-iron, with significant economic importance for China. The …
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(PDF) Geochemical background and dispersion pattern of the …
The Bayan Obo deposit is the largest deposit of rare earth elements (REEs) in the world, with its light REE (LREE) reserve constituting approximately 45% of the world's total LREEs. This study ...
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A preliminary investigation of autometasomatic phenomena
Geotectonically, the Bayan Obo deposit is located on the northern margin of the North China platform. When the Proterozoic Bayan Obo Group was formed, the area was probably a rift tectonic ...
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Bayan Obo Rare Earth Mine, Inner Mongolia, China
The Bayan Obo mine site is spread over 48km 2 in the Inner Mongolia Autonomous Region, on the northern edge of the North China Kraton, approximately 150km north-west of Baotou. Bayan Obo is a massive polymetallic rare earth element (REE) and iron ore deposit of hydrothermal origin. Mineralogy of the Bayan Obo ore
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ISIJ Int. 58(2): 364-366 (2018)
Generally, the Bayan Obo deposit has been mainly mined as an iron ore in China, while only 70% of iron and 10% of REEs migrate to the iron and rare-earth concentrates after mineral processing5) respectively. Considering that only 230 million ton ores were left in the Bayan Obo ore body while the designed capacity was 12 million ton annually,6) many
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Geological features and genesis of the Bayan Obo REE ore …
Abstract. Geotectonically, the Bayan Obo deposit is located on the northern margin of the North China platform. When the Proterozoic Bayan Obo Group was …
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Determining the location of the Bayan Obo rare earth elements
ABSTRACT. Bayan Obo is the largest rare earth element (REE) deposit in the world. The occurrence of REE is closely related to the dolomite in this area. Dolomite serves as the …
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Abstract EGU23-5183
As the world's largest rare earth elements (REEs) deposit, the giant Bayan Obo deposit accounts for more than one third of the world's REEs resources. Fenitization is an alkali metasomatism that widely occurs around the carbonatite dykes at Bayan Obo and recent studies reveal huge quantities of REEs could be transferred from the alkaline magma ...
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The giant Bayan Obo REE-Nb-Fe deposit, China: Controversy …
The Bayan Obo deposit is located approximately 90 km south of the China and Mongolia border, at 109°58′E and 41°48′N, and just situated at the northern margin of the North China Craton (NCC), bordering the Central Asian Orogenic Belt to the north (Xiao et al., 2003, Xiao and Kusky, 2009) (Fig. 1).Gentle fold structures, composed mostly of …
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B 2143 Contents
Internal isochrons of monazite from two samples (7B31-2 and 7B31-9) of Bayan Obo ores that have essentially the same internal isochron mineral ages and 208Pb/204Pb initial ratios 22. Internal isochrons of bastnaesite from sample 85-10,21-4 and monazite from sample 7B30-20 having different internal isochron mineral ages but high radiogenic 208 ...
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