Rare earth resources in the weathered crust elution-deposited rare earth ore (WCEDRE-ore) are mainly recovered by in situ leaching process. A new understanding of the engineering properties modification of WCEDRE-ore as well as the occurring microscopic mechanism was presented when leaching using ammonium sulfate agent occurred. …
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 …
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 ...
The ion-adsorption type rare earth ore is an unconsolidated bed of clay minerals. Column leaching, heap leaching and in situ leaching are used in the industrial practice [].Nowadays, rare earth is recovered by in situ leaching process with (NH 4) 2 SO 4 solution in the industry and precipitated with ammonium bicarbonate. However, there …
In-situ leach mining is now the dominating technology, given that there is less topsoil removed, the ... capable to extract the significant amounts of REEs absorbed on clay minerals such as kaolinite, halloysite and montmorillonite at room ... Yang XJ, Lin A, Li XL, Wu Y, Zhou W (2013) China's ion-adsorption rare earth resources, mining ...
Ion-adsorbed rare-earth ores are mined using in-situ leaching, and their mechanical proper-ties significantly afect the eficient and safe recov-ery of rare earth elements. …
The concentration of rare earth ion and Al element in rare earth ore was determined by Inductively Coupled Plasma Emission Spectrometer (ICP-OES). The total content of REEs in ion-adsorption type rare earth ore was shown in Table 1, and the total content of REEs could be calculated as 731.91 mg/kg. Al element accounted for 6.87 %.
The soil-water characteristic curve is the basic constitutive relation to express the water-holding characteristics of ion-absorbed rare earth. ... provides an effective solution to the landslide early warning …
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 ...
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 …
rare earth [1, 2]. Ion-absorbed rare earth mainly distributes in seven provinces and regions in South China. It is the stra-tegic resource that is concerned by the whole world and it is titled as the "mother of new materials" and "industrial gold." Currently, ion-absorbed rare earth is mainly exploited by in situ leaching. In leaching ...
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 ...
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 …
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.
A clear understanding of the evolution characteristics of leaching solution's damage to the basement rock of ion-adsorbed rare earth deposits is essential in the in situ leaching mining.
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 …
about the behavior of leaching agents and the fractionation of RE and heavy metal during the mining process for ion adsorp-tion of rare earth ore (IRE-ore) in the previously available papers. In this study, (NH 4) 2 SO 4 solution, which commonly used in the production of mining IRE-ore, was used as a leaching agent.
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 …
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 …
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 …
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 ...
A clear understanding of the evolution characteristics of leaching solution's damage to the basement rock of ion-adsorbed rare earth deposits is essential in the in …
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 …
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 …
Tang XZ, Li MN, Yang D. The problem of reabsorption of ion-absorbed rare earth mineral in situ leaching mining and the measure to overcome it. J Central South Univ Technol Sci Technol. 1998;29(6):13. Google Scholar Chi RA, Tian J. Review of weathered crust rare earth ore. J Chin Rare Earth Soc. 2007;25(6):641.
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 …
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 …
Mineral Economics. 2014; Rare earth metals are important inputs into the development and manufacturing of many green and high-tech products. ... In-Situ Leach Mining of Ion-Absorbed Rare-Earth Mineral and Some Problems in Application and Dissemination. Zhao Zhongbo. Engineering, Materials Science ...
Water Pollution Prevention Method for In-Situ Leach Mining of Ion-Absorbed Rare-Earth Mineral. Li Qing. Environmental Science. 2011; When ammonium sulphate as leaching solution is applied in the in-situ leach mining of ion-absorbed rare-earth mineral,the leaching solution permeating underground increases the ammonium concentration ...
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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