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 ...
· 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 …
· The leachate is continuously recirculated in the in situ leaching process, until the additional rare earth extraction becomes too low to make the mining operation worthwhile (Ding, pers. comm.)—i.e., the concentrations of rare earths and impurities decrease during …
· , 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.
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 ...
· 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 ...
· 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.
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 ...
· in situ leaching of ion adsorption clay rare earth (group e)
The 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).
The in situ leaching process of China''s unique ion-adsorption rare earth ores has caused severe environmental damages due to the use of (NH 4) 2 SO 4 solution. This study reports that magnesium sulfate (MgSO 4) as a leaching agent would replace (NH 4) 2 SO 4 by ultrasonically assisted leaching to deal with the ammonia-nitrogen pollution problem and enhance leaching process.
In rare situations, an in-situ leaching process (also called solution mining) is carried out, in which the leaching reagent is injected into wells drilled in the orebody to selectively leach the rare-earth species and the leachate is collected, thus minimising environmental pollution (Li and Yang, 2014). Rare
· 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 ...
Present article is dedicated to development of rare-earth metals recovery sorption technology from in-situ leaching uranium solutions. Sampling of productive solutions were performed from ...
The mctallogcnic regularities of migration ennehinent of rare earth. the seepage mechanism of in-situ leaching, the reduction of orebody stability, the mechanism of landslide, the novel compound leaching agent prevented the swelling of lhe clay minerals, the improvemcnl and promotion of rare earth extraction technology were suggested to pay ...
· To overcome the serious water pollution and landslides that occur in response to in situ ion-adsorption rare earths (IAREs) leaching, it is essential to identify highly efficient and environmentally benign leaching reagents. Therefore, the leaching efficiency (LE) of IAREs by different inorganic electrolytes at different concentrations was compared, and the landslides and ion releasing ...
· 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 ...
· 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 ...
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 ...
There are three main Jiangxi Gannan ion adsorption-type rare-earth ore mining process,which are: pool leaching, heap leaching and in-situ leaching [1,2]. The main leaching agent is ammonium ...
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]
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 …
In-situ leaching mining (see the mining background page) has been introduced as the required mining method for those new mines that can physically implement this technology. Saponification, a step of the refining process that leaves the wastewater highly toxic, can be improved through a newly discovered method that eliminates the need for ammonia.
· 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.
· 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 …
· 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.
· 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-rare earth impurities in the ion ...
leaching but was found to be insignificant as the system reached equilibrium. Solids concentration in the leaching medium has an important role in establishing the throughput capacity of the leaching system. Test results found that an increase in solids concentration had a significant negative effect on rare earth …
· 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 ...
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 …
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.
· 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 …
