By simulating the in situ leaching process of rare earth ions, this paper builds the test stope true three-dimensional numerical model and simulates the leaching process of rare earth ore under ...
DetailsIn-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 …
DetailsIntroduction. Recently, the growing demand for rare earth metals (REM) has generated significant interest in the community as technological innovations invade our lives. In …
DetailsAs an environmentally compliant hydrometallurgical process, in situ leaching is extensively used by the mining industry to recover rare earth from weathered crust elution-deposited rare earth ore. In the in situ leaching system, the pore structure plays a dominant role in the permeability of the rare earth orebody and is one of the …
DetailsImproving the seepage of leaching solution in the ore body and strengthening the mass transfer process of rare earth ions during in-situ leaching are two critical methods to improve the leaching efficiency of rare earth. In this study, 2 wt% MgSO 4 solution was used for the indoor simulated column leaching experiment on rare earth …
DetailsThe 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, …
DetailsWeathered crust elution-deposited rare earth ores (WREOs) are significant strategic mineral resources. In industry, in situ leaching technology is usually applied with ammonium chloride and ammonium sulfate as the leaching solution. However, the slow seepage velocity of the leaching solution and low rare earth leaching efficiency still …
DetailsConsidering the high urgency of researches for alternative sources of rare metals and innovative technologies for its recovery, the possibility of REM recovery from in situ leaching (ISL) process solutions of uranium was studied. This kind of raw material is promising because of the absence of minerals leaching costs, due to the organization ...
DetailsAs the energy consumption of the purged Nd-Fe-B sludge during the in situ anodic leaching was significantly lower than that of the roasted Nd-Fe-B sludge (Table 1 and Table S3), a selective leaching process based on the in situ anodic leaching was designed to recover REEs from the purged Nd-Fe-B sludge. In this process, both the …
DetailsIn-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 …
DetailsTo date, three major types of leaching techniques have been developed for IAD mining 16 —namely, pond leaching, heap leaching and in situ leaching, among which in situ …
DetailsDuring in-situ leaching in IAREO, the rare earth ions exchanged by the leaching agent can be re-adsorbed onto clay minerals, thereby reducing the extraction efficiency of REEs.
DetailsCurrently, the primary method for leaching rare earth ores is through in situ leaching. This approach involves contact between clay minerals and liquids, which can lead to the …
DetailsBy simulating the in situ leaching process of rare earth ions, this paper builds the test stope true three-dimensional numerical model and simulates the leaching process of …
DetailsIn this study, the three governing equations of solution seepage, ion exchange, and solute migration of ionic rare earth in situ leaching ore were used to construct a meso-ore …
DetailsIon-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 …
DetailsThe large amount of residual soil ammonium nitrogen (NH 4-N) after in-situ leaching is a legacy environmental issue for ionic rare earth mines.Understanding and mitigating the associated risk to the aquatic ecosystems of the mining as well as its downstream areas would benefit from a quantitative description and prediction of NH 4 …
DetailsThe in situ leaching technology has been used for exploitation of ion-adsorption rare earth element (REE) deposits in South China for more than 20 years. The present study …
DetailsChen Zhuo et al. studied the leaching process of rare earth with formate (ammonium formate, potassium formate, and sodium formate) and found that when the concentration of ammonium formate was 1% at room temperature, the leaching rates of rare earth and …
DetailsIn order to simulate and calculate the leaching process of ionic rare earths more realistically, a digital model of ionic rare earths with real size, shape, seepage channel, …
DetailsThe leaching experiment was carried out by column leaching to simulate the in-situ leaching in the mine. The leaching columns used in the experiment were self-made, with an inner diameter of 50 mm. ... Ammonium concentrations of 15 mmol/L and 30 mmol/L were selected to investigate the leaching process of rare earth and aluminum …
DetailsThe ammonium sulphate ((NH 4) 2 SO 4) in-situ leaching process is the most widely used extraction technology for weathered crust elution-deposited rare earth ores (WCED-REOs).Highly concentrated (NH 4) 2 SO 4, a representative leaching agent, is often used in the leaching process of WCED-REOs.However, this in-situ leaching …
DetailsA 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 …
DetailsThe chemical reaction of ion-adsorption type rare earth during in-situ leaching process is accompanied by ion migration and charge movement, making the leaching process electrochemical in nature. The chemical reaction rate plays an important role in the leaching rate of rare earth elements. In this work, electrochemical impedance …
DetailsIn the process of the in situ leaching of weathered crust elution-deposited rare earth ores (WCE-DREOs), there are many problems in the conventional leaching agent, such as a slow leaching rate, low leaching yield and long leaching period. In order to solve the above problems, 2.0 wt% ammonium sulfate was mixed with hydroxypropyl …
DetailsVarious methods are used to carry out the leaching such as in situ leaching, heap leaching, dump leaching, vat leaching, agitation leaching, bacterial leaching (microorganisms ... Column leaching process of rare earth and aluminum from weathered crust elution-deposited rare earth ore with ammonium salts. Transactions of …
DetailsThe most common Cu ore minerals such as chalcopyrite and bornite, however, are sulfides which can only be dissolved with the addition of oxidants such as oxygen. Even then, this process is slow, and ISL is used on relatively few Cu deposits. In situ leaching is also used for some rare earth element (REE) deposits. The ion …
DetailsUranium, a cornerstone for nuclear energy, facilitates a clean and efficient energy conversion. In the era of global clean energy initiatives, uranium resources have emerged as a vital component for achieving sustainability and clean power. To fulfill the escalating demand for clean energy, continual advancements in uranium mining …
DetailsThe leaching process of weathered crust elution-deposited rare earth ore has successively developed the process of sodium chloride barrel leaching, ammonium sulfate bath leaching/heap leaching, and ammonium sulfate in situ leaching to recover rare earth [14,15,16]; the problems of rare earth recovery from weathered crust elution …
DetailsRare earth materials are strategic resources of global concern, and are known as the mother of new materials and industrial gold. At present, the ion-absorbed rare earth mines are mainly exploited by the in situ leaching method. A schematic sketch of the leaching mining process is shown in Fig. 1. The erosive effect of the leaching solution …
DetailsThe shielding capacity of anions in the leaching agents for rare-earth ions was measured in this study. ... Establishing a mathematical model corresponding to the physical and chemical process of the in situ leaching process and determining the liquid injection parameters is an effective solution to solve the difficulties of leaching IATREOs ...
DetailsThe ammonium sulphate ((NH4)2SO4) in-situ leaching process is the most widely used extraction technology for weathered crust elution-deposited rare earth ores (WCED-REOs).
DetailsThe increasing demand for rare earth elements (REEs) motivates the development of novel strategies for cost-effective REE recovery from secondary sources, especially rare earth tailings. The biggest challenges in recovering REEs from ion-adsorption rare earth tailings are incomplete extraction of cerium (Ce) and the …
DetailsDuring in-situ mining and leaching of ionic rare earth ore, a chemical replacement reaction occurs between the leaching agent and rare earth ore. The thickness of the shear layer on the surface of colloidal particles is an important physical parameter. Based on the Gouy–Chapman double-layer theory and Poisson–Boltzmann equation, …
DetailsIn order to simulate and calculate the leaching process of ionic rare earths more realistically, a digital model of ionic rare earths with real size, shape, seepage channel, and pore ratio and distribution at the mesoscopic scale was constructed based on nuclear magnetic resonance imaging (NMRI) technology. And the in situ leaching …
Details1. Introduction. Weathered crust elution-deposited rare earth ores (WREOs) are rich in medium and heavy rare earths, which have great commercial and economic value. 1, 2, 3 In industry, the in-situ leaching technology is widely adopted in the mining of WREOs, which mainly involves mass transfer process and seepage process. 4 Mass …
DetailsMetals are currently almost exclusively extracted from their ore via physical excavation. This energy-intensive process dictates that metal mining remains among the foremost CO 2 emitters and mine waste is the single largest waste form by mass. We propose a new approach, electrokinetic in situ leaching (EK-ISL), and demonstrate its applicability for a …
DetailsThe 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 nature. The chemical reaction rate plays an important role in the leaching rate of rare earth elements. In this work, electrochemical …
DetailsIn situ leaching of ion-adsorption rare earth element (REE) deposits has released large amounts of REE-containing wastewater. ... (Liu et al., 2016). The free REE ions represent the most active phase of the bio-geochemical process, while REEs are mostly complexed with ligands and adsorbed by colloids in various environments …
DetailsIn order to intensify the leaching process of rare earth (RE) and reduce the impurities in the leachate, ammonium chloride (NH 4 Cl) and ammonium nitrate (NH 4 NO 3) were mixed as a compound leaching agent to treat the weathered crust elution-deposited RE ore.Effects of molar ratio of NH 4 Cl and NH 4 NO 3, ammonium (NH 4 +) …
DetailsPE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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