in situ leaching rare earth

  • CN103509944A

    The invention discloses a method for in-situ leaching of rare-earth ores from a weathering crust elution-deposited rare earth ore. The method comprises the following steps: holes are drilled in an ore body and drilled from a humus layer, a completely weathering layer to a half weathering layer of the ore body, a guide pipe with an opened upper part and an opened lower part is inserted into the ...

  • Readsorption of rare earth elements during leaching ...

     · A leaching experiment on simulated rare earth ore pillars with uneven grade distribution was conducted because of the readsorption of rare earth elements in the in situ leaching process of ion-adsorption-type rare earth ore. Results show that the readsorption of rare earth elements in the barren layer is the main reason for the decrease in rare earth concentration in the leachate, decrease …

  • Grain Size Distribution and Clay Mineral Distinction of ...

     · leaching rate. This analysis was performed using di erent methods, such as regional rare earth mine soil surveys, in situ leaching profile monitoring, and indoor simulated leaching. The results showed that the grain size and volume curve of rare earth ore …

  • leaching and adsorption in thailand

    Leaching and adsorption circuits for better metal extraction. The Leach-CIP circuit is a system comprised of separate leaching and adsorption tanks. In leaching, ore which has been ground to pulp is placed in agitated tanks with sodium cyanide solution and gold and silver is …

  • Rare earth metals sorption recovery from uranium in situ ...

     · Rare earth metals (REM) are a group of 17 chemical elements, also known as technological metals because of their widespread use in a lot of high-tech products manufacture (computers, mobile phones, flat panels, wind turbines, etc.) [] nsidering the high urgency of researches for alternative sources of rare metals and innovative technologies for its recovery [], the possibility of …

  • PROVENANCE AND TRACEABILITY OF RARE EARTH PRODUCTS

    Production of rare-earth elements A limited quantity of REE are recovered from end-of-life (EOL) products, and some REE are recovered by reprocessing tailings that were generated during uranium production. However, almost all current production comes from either in-situ leaching or mining and beneficiation, followed by hydrometallurgical

  • Toward a more sustainable mining future with ...

    Toward a more sustainable mining future with electrokinetic in situ leaching. 1 School of Earth Sciences, University of Western Australia, Crawley, WA 6009, Australia. 2 Department of Civil, Environmental and Mining Engineering, University of Western Australia, Crawley, WA 6009, Australia. 3 CSIRO Land and Water, Private Bag 5, Wembley, WA 6913 ...

  • Electrically Controlled Mining of Rare Earth Metals ...

     · Electrically controlled acid mining of rare earth metals. There is a proof of concept to use an electric field to control the movement of an acid within a low permeability copper-bearing ore deposit to selectively dissolve and recover the metal in situ.. This can transform the mining industry because it has the capability to dissolve metals from a wide range of ore deposits that were ...

  • Hydrometallurgical Recovery Process of Rare Earth Elements ...

     · Rare earth elements (REEs) are essential ingredients for developing modern industry as well as designing and developing high technology products used in our daily lives. However, China monopolizes the supply chain for rare metals, and there have been growing concerns around limited supply in other countries. As such, there is demand for intensive research into the recovery of REEs …

  • China Wrestles with the Toxic Aftermath of Rare Earth ...

     · The first involved removing layers of topsoil and transporting them to a leaching pond, where acids and chemicals were used to separate the various rare earth elements from the clay, soil, and rock. The other process involved drilling holes into hills, inserting PVC pipes and rubber hoses, and then flushing out the earth using a mix of water ...

  • A review of electrokinetic, ultrasonic and solution ...

    In-situ recovery (ISR), which is also termed in-situ leaching, has been proposed to recover metals, with a reduced environmental impact, smaller surface footprint, less energy usage, no tailings generation and a lower operational cost compared with conventional mining methods (Bahamòndez et al., 2016).

  • Microbial communities in rare earth mining soil after in ...

    In-situ leaching technology is now widely used to exploit ion adsorption rare earth ore, which has caused serious environmental problems and deterioration of mining soil ecosystems. However, our knowledge about the influences of mining operation on the microbiota in these ecosystems is currently very limited. In this study, diversity and composition of prokaryote and ammonia-oxidizing ...

  • Transport kinetics of Pollutants in In-Situ Leaching of ...

    Abstract Taking Ganzhou city longnan zudong in-situ leaching of ionic rare earth ore soil as the research object, (NH4) 2SO4 as the leaching agent,we forecast and analyze leaching residues pollutants''diffusion rule over time in the soil layer. Constructing pollutants dispersion model,fitting pollutant dispersion changes based on Matlab platform, results show: As time increases, both NO3--N ...

  • State of rare earth elements in the rare earth deposits of ...

     · We studied the states of rare earth elements in ore of the Xianglushan rare earth deposit. Rare earth ore samples were tested and examined by scanning electron microscope, electron probe, and chemical leaching. No independent rare earth minerals were detected by scanning electron microscope. Elements detected by the electronic probe for the in situ micro-zone of the sample included: O, Al, Si ...

  • of Rare Earth in Laboratory Leaching Tests

     · deposit [3,4]. At present, in situ leaching is the main mining method for this type of rare earth deposit for its great advantages in terms of mining costs and environmental protection [5]. However, there is a low recovery yield of rare earth and long leaching time when employing the in situ leaching method [6].

  • Leaching of rare earth elements. Dust Monitoring Equipment ...

     · Modelling in-situ leaching of rare earth elements. As the grades of ore, containing precious metals, decline leaching can under certain circumstances present a potentially more economically viable and environmentally friendly process option compared with traditional pyro-metallurgical processes.

  • Uranium mining by in-situ leaching

    Although in-situ leaching system is an enclosed process, involving little contact with the mining solutions is very harmful. Hence, the primary environmental considerations for in-situ mining are associated with a) The control of lixiviant during mining. b) The restoring of aquifer back to usable conditions after mining.

  • In-Situ Leaching & Borehole Mining

     · In Situ Leaching Copper . The leaching portion of the in situ mining program (particularly for copper) is divided into three broad depth ranges: surface, near surface, and deep (fig. 1). Most of the copper ore bodies in the surface category are above the water table, and little, if any, overburden covers the ore.

  • Minerals | Special Issue : Leaching of Rare Earth Elements ...

     · This analysis was performed using different methods, such as regional rare earth mine soil surveys, in situ leaching profile monitoring, and indoor simulated leaching. The results showed that the grain size and volume curve of rare earth ore have unimodal and bimodal shapes, respectively.

  • of Rare Earth in Laboratory Leaching Tests

    Microbial communities in rare earth mining soil after in ...

  • Leaching of rare earth elements from

    Accordingly, acid leaching experiments were performed to study the desorption of three commonly-found rare earth elements, namely neodymium, samarium, and dysprosium, from bentonite clay in the presence of sulphuric and hydrochloric acid. It was established that the three rare earth element species could be selectively removed as

  • Effect of Rare Earth Ions on Regular of Nitride Migration ...

    Abstract. Ion-adsorption rare earth ore mining with ammonium sulfate as leaching agent in situ leaching is not perfect, due to seepage and other technical measure, which easily results in serious nitride pollution of soil and water in mining and surrounding areas. In this paper, the effect of rare earth ions of different species and different ...

  • US Patent for Reactor systems for recovering metals, and ...

     · A method of recovering metals from electronic waste comprises providing a powder comprising electronic waste in at least a first reactor and a second reactor and providing an electrolyte comprising at least ferric ions in an electrochemical cell in fluid communication with the first reactor and the second reactor. The method further includes contacting the powders within the first reactor and ...

  • An overview of rare-earth recovery by ion-exchange ...

     · , He, Z. and Ruan, Y (2014) Novel solution injection technology for in-situ leach¬ing of weathered crust elution-deposited rare earth ores. Proceedings of the 53rd Conference of Metallurgists (COM 2014), Metallurgical Society of the Canadian Institute of Mining, Metallurgy and Petroleum (MetSoc-CIM), Vancouver, Canada.

  • China''s ion-adsorption rare earth resources, mining ...

    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. The in-situ leaching does not require clearing of vegetation and forests or the removal of topsoil, instead drilling of leaching holes with a ...

  • Leaching Process and Mechanism of Weathered Crust Elution ...

     · The leaching processes and mechanisms of weathered crust elution-deposited rare earth (RE) ores with ammonium sulfate were investigated for their high efficiency and low consumption exploitation. The leaching process is a typical reversible heterogeneous ion exchange reaction in liquid–solid systems. The raw ore and leached tailings were analyzed by SEM and FTIR.

  • Regolith-hosted rare earth element deposits

    Regolith-hosted rare earth element deposits (also known as ion-adsorption deposits) are rare-earth element (REE) ores in decomposed rocks that are formed by intense weathering of REE-rich parental rocks (e.g. granite, tuff etc.) in subtropical areas. In these areas, rocks are intensely broken and decomposed. Then, REEs infiltrate downward with rain water and they are concentrated along a ...

  • in situ leaching of rare earth

    of Rare Earth in Laboratory Leaching Tests. deposit [3,4] At present, in situ leaching is the main mining method for this type of rare earth deposit for its great advantages in terms of mining costs and environmental protection [5] However, there is a low recovery yield of rare earth and long leaching time when employing the in situ leaching method [6]

  • Minerals | Free Full-Text | Grain Size Distribution and ...

    This analysis was performed using different methods, such as regional rare earth mine soil surveys, in situ leaching profile monitoring, and indoor simulated leaching. The results showed that the grain size and volume curve of rare earth ore have unimodal and bimodal shapes, respectively.

  • Minerals | Free Full-Text | Leaching of Rare Earth ...

    In China, about 10,000 tons of rare earth oxide (REO) concentrate are produced annually from weathered elution-deposits derived from lateritic weathering of granitic rock and in situ aqueous mining yields ~200 tons of REE annually . This study characterizes and tests the leaching behavior of underclay rock from geologic formations associated ...

  • WELL DESIGN AND CONSTRUCTION FOR IN SITU LEACH …

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  • What is "In Situ" Mining? – Black Hills Clean Water Alliance

    In situ leach mining (ISL) is a method of uranium mining where hundreds of wells are drilled in a "grid pattern" over an ore body that is located in a groundwater aquifer. Water mixed with sodium bicarbonate concentrate is pumped down into the aquifer, across the uranium ore bed, and them up …

  • Aggregate Evolution Mechanism during Ion-Adsorption Rare ...

     · During the in situ leaching of ion-adsorption rare earth ores, the pore structure of the ore body changes dynamically with the injection strength and the duration of liquid injection. This series of changes to the pore structure directly affects the permeability characteristics of the ore body.

  • Clay vs Hardrock – Ionic Rare Earths

    Ionic Clay Rare earth elements vs Hard Rock Rare Earth ElelemENTs Projects. ... Potential for static or in-situ leaching with low reagent consumption at ambient temperature: Comminution, followed by benefication that often requires expensive (flotation) reagents to produce mineral concentrate.

  • Environmental Risks of Mining

    In situ leach (ISL) mining. ... and sulfuric acid for each ton of rare earth elements produced. Additionally, nearly 75 cubic meters of acidic waste water and one ton of radioactive waste residue are generated (Paul & Campbell, 2011). Preemptive actions such as stricter regulations and proper waste disposal strategies can reduce the costs of ...

  • Novel solution injection technology for in-situ leaching ...

     · In the novel in-situ leaching technology, the content of exchangeable rare earth and aluminum were 0.846 g/L and 0.121 g/L in rare earth leaching solution, respectively, and the simulative leaching experiments was obtained 1.335 g rare earth and 0.193 g aluminum in sulfate-based solution. It can be found that the content of exchangeable ...

  • Leaching Process of Weathered Crust Elution-Deposited Rare ...

     · The rare earth leaching efficiency can reach 87% when 1 wt% ammonium formate was used to leach the rare earth ore, while the leaching efficiency of aluminum was 37%. Besides, at the optimal concentration of 1.5 and 2.5 wt% of potassium formate and sodium formate, the leaching efficiencies of rare earth were 80 and 79%, respectively.

  • Microbial communities in rare earth mining soil after in ...

    In-situ leaching technology is now widely used to exploit ion adsorption rare earth ore, which has caused serious environmental problems and deterioration of mining soil ecosystems. However, our knowledge about the influences of mining operation on the …