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Ion-adsorbed rare earth minerals are mainly distributed in the south of China and are named for rare earth elements adsorbed in the form of cations on the surface of clay minerals weathered by granite or …
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Almost all known heavy rare earth resources in the world occur in this form [7], and it is significant to effectively exploit ion-absorbed rare earth resources. In ion-adsorbed rare earth ores, REEs are adsorbed on clay mineral surfaces in an ionic state [8]. As such, cation exchange has become the main extraction method of these elements.
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situ leaching. In leaching mining, solution of salt leaching. agent is injected into the clay ore through the injection well, ... mineral leaching of ion-absorbed rare earth, hydrated cations ...
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In situ leaching was a very important technical approach in ion-adsorption rare earth mining, because it can effectively avoid the geological hazards, protect the environment, and reduce the ...
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Ion-absorbed rare-earth ores have seen three different mining methods employed across generations: vat leach - ing, heap leaching, and in-situ leaching (Yang et al., 2013; Zhang et al., 2016). At present, in-situ leaching is the predominant method for extracting rare-earth re-sources, and the leaching agents have transitioned from
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Although clay mineral content in ion-absorbed rare earth ores is crucial for migrating and releasing rare earth elements, the formation, distribution, and migration of clay minerals in supergene ...
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Currently, ion-absorbed rare earth is mainly exploited by in situ leaching. In leaching mining, solution of salt leaching agent is injected into the clay ore through the injection well, thus triggering chemical replacement reaction between ammonium ions in the leaching solution and rare earth ions adsorbed on the clay. ... During the mineral ...
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Xunzhong and Maonan made an introduction to the technical process of in situ leaching of ion-absorbed rare earth minerals, and they proved that this type of in situ leaching had many advantages . Based on the principle of pollution control, Zhu et al. proposed six pollution control measures to serve as reference for mine design, pollution ...
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A Review of the mining technologies of ion-absorbed rare earth mineral. J Chin Rare Earth Soc. 2016;37(3):129. ... The problem of reabsorption of ion-absorbed rare earth mineral in situ leaching mining and the measure to overcome it. J Cent South Univ (Sci & Technol). 1998;29(6):523. CAS Google Scholar Chi RA, Wang DZ. Rare …
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The alternative technique of in-situ leaching for ion-adsorption rare earth minerals was developed in the mid-1980s and the first plant began operating in 1997. ... In-situ leach mining of ion-absorbed rare-earth mineral and some problems in application and dissemination. Journal of the Southern Institute of Metallurgy (in Chinese), 21 ...
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The chemical reaction of ion-adsorption-type rare earth ore during the in situ leaching process is accompanied by ion migration and charge movement, making the leaching process electrochemical in ...
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Mariano A (2012) Rare earth mining and exploration in North America. Elements 8(5): 369-376. Wu C, Yuan Z, Bai G (1996) Rare earth deposits in China, Rare Earth Miner. Chem Orig. Jun T, Jingqun Y, Ruan C, Guohua R, Mintao J (2010) Kinetics on leaching rare earth from the weathered crust elution-deposited rare earth ores with …
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Semantic Scholar extracted view of "Spatiotemporal distribution of residual ammonium in a rare-earth mine after in-situ leaching: A modeling study with scarce data" by Xiaoying Yang et al. ... Ion-absorbed rare earth mines, leached in situ, retain a large amount of ammonium nitrogen (NH_4—N) that continuously releases into the …
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Heap leaching for rare earth elements poses a serious long-term threat to the adjacent ecological systems in mining areas. The purpose of this research is to thoroughly study the environmental effects of heap leaching in ion-adsorption rare earth element mine tailings after restoration by ecological measures. Soil samples were …
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To date, three major types of leaching techniques have been developed for IAD mining 16 —namely, pond leaching, heap leaching and in situ leaching, among …
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Currently, in situ leaching technology is widely recommended for the mining of ion-absorbed rare earth ores, which provides the advantages of high efficiency, being environmentally …
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The chemical reaction of ion-adsorption-type rare earth ore during the in situ leaching process is accompanied by ion migration and charge movement, making the leaching process electrochemical in …
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During rare earth mining, in-situ leaching technology instead of obsolete pool leaching and heap leaching techniques has been widely used to separate and extract ion-absorbing heavy rare earth ...
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Ganzhou Rare Earth Mining Co., Ltd, China Rare Earth Group Co., Ltd, Ganzhou 341000, China ... used on ion-absorbed rare-earth ores: vat leaching, heap leaching, and in-situ leaching (Yang et al. 2013; ... strength of in-situ rare-earth ore samples and the par-ticle size grading as well as the void ratio. Yin et al.
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The mining of ion-adsorption rare earth minerals or ores generated a large amount of wastewater containing rare earth elements at low-concentration, resulting in continuous environmental pollution. For this problem, our study prepared an efficient, recyclable MgO/MgFe 2 O 4 magnetic adsorbent, synthesized by a template method …
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In-Situ Leach Mining of Ion-Absorbed Rare-Earth Mineral and Some Problems in Application and Dissemination. Zhao Zhongbo. Engineering, Materials Science. 2000; The author makes an approach to the principle of in-situ leach mining,establishes the route of ... Ion-absorbed rare earth deposits mining and separating technologies …
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In-situ leach mining of ion-absorbed rare-earth mineral and some problems in application and dissemination. Journal of the Southern Institute of Metallurgy (in Chinese) 21 (3), 179 – 183 . Zuo ...
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In 1970, ion-adsorption rare earth deposits were first discovered in Ganzhou, China. These deposits were formed by chemical weathering decomposition and dissolution of granites, which contained relatively high abundance of rare earth elements [7]. Ion-adsorption rare earth reserves only accounted for 2.9% of the total rare earth reserves …
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Ion-adsorption-type rare earth ores (IRE-ores) are a vital source of rare earth elements globally. The percolation properties of the ore body significantly determine the ease of rare earth extraction using in situ leaching processes. This paper investigates the interactions among clay particles in ion-adsorption-type rare earth ores within …
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Ion-absorbed rare earth ores radioactive residues (IREORR) are a class of waste residue from the production of rare earth elements (REEs). Because of its radioactive dose, IREORR are usually stored in waste warehouses. IREORR are difficult to be disposed of. However, it contains relatively high concentrations of REEs, which can …
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analyze and predict condition variables' data and leaching efficiency index in the heap leaching process of rare earth ore, with a prediction accuracy exceeding 90%, thus providing intelligent guid-ance for the heap leaching process of rare earth ores. Keywords: rare earth ore; heap leaching; data mining; process prediction 1.
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Ion-adsorbed rare-earth ores are mined using in-situ leaching, and their mechanical properties significantly affect the efficient and safe recovery of rare earth elements. However, the mechanism of the change in the mechanical properties of the ore body due to the physicochemical processes caused by leaching remains unclear. To …
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In situ leaching of ion-adsorption rare earth element (REE) deposits has released large amounts of REE-containing wastewater. However, the origin, speciation, …
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The leaching process of ion-absorbed type rare earth ores involves ion exchange between the cations in the electrolyte solution and the REE ions adsorbed on the surfaces of the clay minerals (Chen et al., 2020). However, the changes in clay mineral content and alterations in the clay mineral microstructures in rare earth ores are still …
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The most important rare earth minerals are monazite [(Ce, La, Nd)PO 4], bastnaesite [(Ce, La) (CO 3)F], and yttrium phosphorite [YPO 4], which reserves occupy about 95% of the known rare earth resource reserves. Other rare earth minerals are apatite, fluorite and ion adsorption rare earths (IAREs) (Rasoulnia et al., 2021). LREE …
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