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leaching results indicating the Company could be able to construct a rare earth process flow sheet from mine to final product with considerably less steps and lower risk than traditional ... The results have given the Company confidence that there is an increased likelihood that in-situ leaching of the rare earths is now possible. This is ...
In 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.
In order to increase efficiency and avoid NH 4+ –N pollution in the leaching process of weathered crust elution-deposited rare earth ores, the mass transfer in heap leaching with Al 2 (SO 4) 3 solution was simulated with column elution and experimentally optimized. The results indicate that the leaching yield is also up to 99 % for leaching with …
In 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 …
In the leaching process for recovering rare earth elements from IATREOs, many impurities will be leached together with rare earth elements and enter the leaching liquor. ... In-situ rare earth leaching and enrichment process of ionic type rare earth ore. China Patent: CN 201610899315.3 (2019) Google Scholar. 47. R.G. Da Silva, C.A. de Morais, L ...
Rare earth element enrichment process of bioapatite in deep-sea REY-rich sediments. ... a chemical leaching study on deep-sea sediments found that the Ce/Ce* ratios of the leached bioapatite component ... In situ LA-ICP-MS trace and rare earth element analyses of fish teeth were performed using an Agilent Technologies 7700× quadrupole ICP–MS ...
In industrial practice, the sulfates such as (NH 4) 2 SO 4, MgSO 4 and Al 3 (SO 4) 2 are commonly employed for in-situ leaching of ion-adsorbed RE minerals ... Reducing rare earth loss by adding acetic acid in the aluminum removal process of rare earth leaching solution. J Clean Prod (2024), Article 140537. View PDF View article View in Scopus ...
elution-deposited rare earth ores in the leaching process. In view of this, the rare earth ores of HL, CWL and PWL in the weathered crust elution-deposited rare earth ores 2# and 4# in Dingnan, Jiangxi province in China, were taken as research objects in this study. In order to reveal the seepage mechanism during in-situ leaching of the ...
However, as mentioned in the introduction, the efflux of aluminum lags behind that of rare earth in the column leaching and in-situ leaching process. He et al. 11, 13 believed that the delayed efflux of aluminum in column leaching should be attributed to the lower mass transfer efficiency and other unspecified factors. At a deeper level, we ...
In 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 +) concentration, …
In this paper, a multi-stage leaching process for the weathered crust elution-deposited rare earth ore was proposed using MgSO 4 as a leaching agent. The results indicate that with increasing the concentration of MgSO 4 from 0.5 wt%–1.0 wt% to 2.0 wt%–4.0 wt%, the peak concentrations of rare earths increase from 1.87–3.59 to 5.49–10.21 g/L, and the …
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 unclear.
The traditional extraction process for IRE-ore involves in situ leaching according to the ion-exchange mechanism (Ou et al., 2022).Various electrolyte solutions containing cations such as Na +, NH 4 +, Ca 2+, Mg 2+ and Fe 3+ can be adopted to leach IRE-ore (Huang et al., 2021; Nie et al., 2020; Xiao et al., 2016).Among them, ammonium sulfate ((NH 4) 2 SO 4) is …
During the in-situ leaching process of ion-adsorption rare earth ore, the seepage velocity of the leaching solution is one of the core problems in studying the leaching efficiency.
Ammonium sulfate is typically employed as a leaching agent in the in situ leaching of weathered crust elution-deposited rare earth ore. However, it is associated with …
There are still challenges in the recovery of rare earth elements (REEs) from leaching liquor of ion-adsorption type rare earth ore. In this paper, unsaponified N, N-di(2-ethylhexyl)-diglycolamic acid (HDEHDGA) was used to develop a green extraction process for efficient separation and enrichment of REEs.
The leaching process yielded high REE leaching efficiency of 92.70 % by using a leaching solution with an initial pH of 4, a temperature of 40 °C, and compound ammonium …
Ion-adsorption type rare earth ores (IREO) in China serve as the primary source of medium and heavy rare earth globally. With the rapidly growing demand for rare earth elements (REEs) and the dwindling supply of premium IREO, enhancing the recovery of REEs, especially the ion-unexchangeable REEs with ultra-low content and ambiguous speciation from IREO or its …
Nonetheless, these salts frequently face technical challenges, including relatively low leaching rates and inadequate permeability in the in-situ leaching process. In this study, cetyltrimethylammonium chloride (CTAC) was used as a novel leaching aid agent to improve the rare earth leaching process.
To unveil the impact of each condition variable on the leaching efficiency index during the heap leaching process of rare earth ore and establish a prediction model for leaching conditions and efficiency, common …
Considering the complex and uncontrollable leaching conditions during in-situ leaching, noncontact/indirect bioleaching is more suitable for the mining of ion adsorption rare earth ore. Noncontact/Indirect leaching can separate leaching agent production from the rare earth leaching process so that microorganisms can be cultivated under ...
Ion adsorption type rare earth ore is an important rare earth resource in China and its main mining method is in-situ leaching.Liquid injection activities in in-situ leaching will affect the safety and stability of mountain slopes.Therefore, ensuring the safety and stability of mountain slopes in the process of in-situ leaching is always a difficult problem to be solved urgently.In …
In-situ leaching process of weathered crust elution-deposited rare earth ore (WCE-DREO) often faces problems such as poor permeability and occurrence of landslides. The main reasons are the swelling of clay minerals by water absorption and blockage of seepage channels by fine particles. ... (NH 4) 2 SO 4, the rare earth leaching rate was 90.17% ...
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 are also a lot of non …
In the process of ionic rare earth in situ leaching, the leach-ing agent enters the interior of the ore body through the liq-uid injection hole and reacts with the rare earth ions …
In order to reveal the permeability rule of leaching agent solution and the effects of anions in the leaching process of weathered crust elution-deposited rare earth (RE) ores, the effects of ammonium concentration, temperature, particle size and porosity on the permeability were discussed in detail with (NH 4) 2 SO 4, NH 4 Cl and NH 4 NO 3 as the leaching agent.
Ammonium sulfate in situ leaching process is the most widely used extraction technology for ionic rare earth (RE) ores. Although the leaching process is simple, the leaching rate is satisfactory; moreover, the leaching solution has high impurities, serious ammonia pollution, and other problems.
Currently, in-situ leaching via ammonium sulfate ((NH 4) 2 SO 4) has become one widely employed method for mining ion-adsorption rare earth ores.During the process, (NH 4) 2 SO 4 solution is vertically injected through injection holes at the top and permeates through the fully and partially weathered layers of the ore body. REEs then exchange with the more active …
The 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 from ion ...
In rare earth leaching process, Mg 2+ is more active than RE 3+ in magnesium sulfate solution. After the leaching solution is injected into the ore body and fully contacts with it, ... Experimental study on seepage evolution law of ionic rare earth ore in-situ leaching by magnesium sulfatee. Nonferrous Met. Sci. Eng., 14 (2023), pp. 416-424.