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Chemical and mineral compositions of the raw and treated samples were analyzed using AAS and XRD, respectively. The results show that soluble metal sulfates, such as rhomboclase and mikasite, …
Abstract This review provides an update to the last mini-review with the same title pertaining to recent developments in bioleaching and biooxidation published in 2013 (Brierley and Brierley). In the intervening almost 10 years, microbial processes for sulfide minerals have seen increased acceptance and ongoing but also declining …
Bioleaching exhibits high potential for the processing of low-grade complex mineral resources. With the development of the economy and an increase in demand, rare earth elements (REEs) in secondary resources, such as phosphogypsum, red mud and coal-related resources, are gaining more and more attention. In this review, the …
The effects of different leaching agents for extracting valuable elements from the working ore were compared and evaluated in detail. The optimum leaching conditions achieved by acidic leaching are 200 g/L H2SO4 acid within 4 h agitation time, 400 rpm agitation speed at 353 K, and a liquid/solid (L/S) ratio of 4/1.
Similarly, the use of 0.3–1.0 M peroxide in the leaching of a chalcopyrite concentrate at 75 °C was shown (Ahn et al., 2019) to be no more effective than iron(III) (0.1 M) as an oxidant. In a similar study of peroxide leaching of a chalcopyrite (Adebayo et al., 2003), iron was not added to the lixiviant. In this case peroxide concentrations ...
Mineral processing, art of treating crude ores and mineral products in order to separate the valuable minerals from the waste rock, or gangue. It is the first process that most ores undergo after mining in order to provide a more concentrated material for the procedures of extractive metallurgy.
The effect of biodegradable chelating agents on the recovery of rare earth elements (REE) from clay minerals via ion-exchange leaching was investigated, with the aim of proposing a cost-effective ...
Leaching involves the use of aqueous solutions, which is brought into contact with a material containing a valuable metal; the solution may be acidic or basic. In the leaching process, oxidation potential, temperature, and pH of the solution are important parameters, and are often manipulated to optimize dissolution of the desired metal ...
The leaching procedures A series of experiments were conducted by adding a known amount of the ground ore sample (5g) to a specified volume of various leaching agents in a specified beaker. ... Mueller KK, Cecchi E, Neculita CM, Blais J-F (2020) Assessment of the leaching potential of flotation tailings from rare earth mineral …
Currently, 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 potential swelling of clay minerals with water, triggering natural disasters such as landslides. ... this research provides an effective solution to the landslide early ...
Uranium, 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 …
A pre-leaching procedure involving a carbonated solution is an effective and selective medium for U dissolution and could reduce the presence of U, one of the main radioactive elements in REE minerals, prior to REE …
Leaching is a hydrometallurgical activity widely used in mineral processing, both for metallic and non-metallic ores, and in soil remediation. ... The dissolution of valuable species by heap leaching is strongly dependent on the design and operating variables, so the study of the influence of these variables on recovery and their optimization ...
5.2.2 Heap leaching. This procedure is mainly used for fine-grained ores that cannot be concentrated by flotation. The leaching is practised in large basins containing up to 12 000 tons of ore. ... Bioleaching of non-sulfide ores and minerals is feasible and may be used for the recovery of valuable metals from ores and minerals as well as to ...
application of the Toxicity Characteristic Leaching Procedure (TCLP) to mineral processing wastes (and manufactured gas plant wastes). The Court remanded the TCLP to the Agency for review and, if necessary, further action. This report provides historical background on the issue of the applicability of the TCLP to mineral processing …
They found that the total rare earth enrichment of about 84% was achieved in the final solid by using a washing step with (25 g/L) NaCl followed by leaching the residue with (60 g/L) Na 2 CO 3 at 90 °C for 60.0 min. Leaching of rare earth elements from PG using different mineral acids (HCl, H 2 SO 4, and HNO 3) has been examined by …
Minerals 2021, 11, 586 3 of 11 where g is the precious metal (or iron) recovery rate; C1 is the zinc, copper, or iron amount in the leaching liquid; and C2 is the total zinc, copper, or iron amount in the roasted residue. 2.3. Flotation Experiments The grinding process used the XMQ-'240 90 conical ball mill produced by the
What is leaching? It is a fundamental extraction operation in hydrometallurgical processing that involves transferring a metal of interest from naturally occurring minerals into an aqueous solution.
The present study investigates the use of ammonium sulfate as a lixiviant in the recovery of rare earth elements (REE) from clays. Rare earth ions are physically adsorbed on clay minerals, with concentrations ranging from 0.05 to 0.5 wt.%.It was previously shown that they could be easily recovered via an ion exchange mechanism …
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 rare earth ores have not been fully understood. Therefore, this study analyzes the characteristics of [...] Read more.
To facilitate mineral liberation, wet milling was employed, reducing the d80 particle size to 138 µm in just 11 min. Shengo's dual-pronged mineral processing …
It contributes to 15% of the world uranium production. The major advantage of in situ leaching is that metals or valuable minerals can be recovered without the need for conventional mining techniques, involving drilling, blasting, opencut or large and expensive underground facilities. ... Settler of the solvent extraction procedure in Mufulira ...
Abstract Microwave-assisted leaching of valuable metals of cobalt (Co), lithium (Li), and manganese (Mn) from cathode powder of spent lithium-ion batteries (LIBs) was investigated. Higher leaching efficiency of Co, Li, and Mn was found using ascorbic acid than hydrochloric acid (HCl). The leaching reaction was rapid (5 min) and effective …
Sequential leaching of gold-bearing ore of the residuum is described. The interconnection between rare earth elements and their mineral matrix is defined. The mobility of REE in the initial ore and during hypergenesis is assessed. Two kinds of REE are revealed: fine monazite cerium–neodymium crusts in iron-bearing minerals and …
Ocean polymetallic nodules are oxide ores rich in Ni, Co, Cu, and Mn, which are valuable metals found in deep-sea mineral resources. Such non-ferrous metals do not exist in isolation, and producing concentrates using conventional mineral separation techniques is challenging without pre-treatment. We propose an effective, environmentally-friendly …
Leaching involves the use of aqueous solutions, which is brought into contact with a material containing a valuable metal; the solution may be acidic or basic. In the leaching process, oxidation potential, …
The problem of spent fluid catalytic cracking (SFCC) catalyst resource utilization, draws more and more attention to system analysis. SFCC was leached in an oxalic solution for comprehensive utilization. The results showed that for a D50 ≤ 17.34 μm, the catalyst leached for 240 min at 95 °C in the presence of a 2 mol/L oxalic acid …
Process Development Considering the different gold minerals present alone or combined with the host rock, it will be necessary to discharge the unwanted material in order to increase the concentration of gold in an economically manner. This part treats the strategy of beneficiation as a combination of several processes. Joining together these …
In indirect leaching, the oxidation of the mineral sulfide is caused by the ... Oh CJ, Lee SO, Yang HS, Ha TJ, Kim MJ (2003) Selective leaching of valuable metals from waste printed circuit boards. J Air Waste Manag Assoc 53:897–902 ... Chung IH (2000) Characterization of lead leachability from cathode ray tubes using the toxicity ...
