The Experts below are selected from a list of 62508 Experts worldwide ranked by ideXlab platform
R. Ichino - One of the best experts on this subject based on the ideXlab platform.
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Recovery of Rare-Earth Elements from neodymium magnets using molten salt electrolysis
Journal of Material Cycles and Waste Management, 2017Co-Authors: Y. Kamimoto, T. Itoh, K. Kuroda, R. IchinoAbstract:Rare-Earth Elements are used in neodymium magnets, and these Elements are critical to Japanese industry. In this study, we focused on the electrochemical behavior of neodymium magnets for the recovery of Rare-Earth Elements using molten salt electrolysis. The influence of the Rare-Earth elemental composition of the neodymium magnets on their anodic polarization behavior and oxidation mechanism was studied. The use of potentiostatic electrolysis enabled selective leaching of Rare-Earth Elements from neodymium magnets in the potential range from −1.8 to −0.8 V. The oxidation potential limits the oxidation stage, enabling Rare-Earth Elements to be leached from mixed neodymium magnets simultaneously.
Camp, H.j.m. Op Den - One of the best experts on this subject based on the ideXlab platform.
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Role of Rare Earth Elements in methanol oxidation
2019Co-Authors: Picone N., Camp, H.j.m. Op DenAbstract:For decades Rare Earth Elements (or lanthanides) were considered not to be involved in biological processes, until their discovery in the active site of the XoxF-type methanol dehydrogenase of the methanotrophic bacterium Methylacidiphilum fumariolicum SolV. Follow-up studies revealed the presence of lanthanides in other pyrroloquinoline quinone-containing enzymes involved in alcohol metabolism. This review discusses the biochemistry of the lanthanide-dependent enzymes and the ability of these metals of influencing the gene expression and the type of methanol dehydrogenase used by microorganisms. Furthermore, it highlights novel insights on the uptake mechanism of Rare Earth Elements into bacterial cells
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Role of Rare Earth Elements in methanol oxidation
'Elsevier BV', 2019Co-Authors: Picone N., Camp, H.j.m. Op DenAbstract:Contains fulltext : 198835.pdf (publisher's version ) (Open Access)For decades Rare Earth Elements (or lanthanides) were considered not to be involved in biological processes, until their discovery in the active site of the XoxF-type methanol dehydrogenase of the methanotrophic bacterium Methylacidiphilum fumariolicum SolV. Follow-up studies revealed the presence of lanthanides in other pyrroloquinoline quinone-containing enzymes involved in alcohol metabolism. This review discusses the biochemistry of the lanthanide-dependent enzymes and the ability of these metals of influencing the gene expression and the type of methanol dehydrogenase used by microorganisms. Furthermore, it highlights novel insights on the uptake mechanism of Rare Earth Elements into bacterial cells
Lokshin Ehfroim Pinkhusovich - One of the best experts on this subject based on the ideXlab platform.
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method of phosphogypsum processing for manufacture of concentrate of Rare Earth Elements and gypsum
2012Co-Authors: Lokshin Ehfroim Pinkhusovich, Tareeva Ol Ga Al Bertovna, Kalinnikov Vladimir TrofimovichAbstract:FIELD: metallurgy. ^ SUBSTANCE: method of phosphogypsum processing involves leaching of phosphogypsum with sulphuric acid solution with change-over of phosphorus and Rare-Earth Elements to the solution, and gypsum residues is obtained, Rare-Earth Elements are extracted from the solution and the gypsum residue is neutralised with the main calcium compound. In addition, leaching is performed with sulphuric acid solution with concentration of 1-5 wt %. After that, Rare-Earth Elements are extracted from the solution by sorption using sulfocationite in hydrogen or ammonia form with further desorption of Rare-Earth Elements with ammonia sulphate solution. After desorption to the obtained strippant there added is ammonia or ammonium carbonate with deposition and separation of hydroxide or carbon-bearing concentrate of Rare-Earth Elements. Extraction of Rare-Earth Elements of medium and yttrium groups to concentrates is 41-67% and 28-51.4% respectively. Specific consumption of neutralising calcium compound per 1 kg of phosphogypsum has been reduced at least by 1.6 times. ^ EFFECT: obtaining high-quality hydroxide or carbonate concentrate of Rare-Earth Elements. ^ 4 cl, 4 tbl, 4 ex
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method of recovering Rare Earth Elements from phosphogypsum
2007Co-Authors: Lokshin Ehfroim Pinkhusovich, Kalinnikov Vladimir Trofimovic, Ivlev Konstantin Gennad Evich, Levin Boris Vladimirovich, Pogrebnjak Oleg StepanovichAbstract:FIELD: Rare-Earth element technology. ^ SUBSTANCE: invention relates to technology of recovering Rare-Earth Elements from phosphogypsum obtained from processing of apatite concentrate into mineral fertilizers. Phosphogypsum is treated with 22-30% sulfuric acid solution at liquids-to-solids ratio 1.8-2.2 to recover Rare-Earth Elements and sodium into solution. Insoluble precipitate is separated and degree of oversaturation of solution regarding Rare-Earth Elements is increased by means of providing sodium concentration 0.4-1.2 g/L, after which crystallization of Rare-Earth element concentrate is allowed to proceed and concentrate is then separated from mother liquor. Treatment duration is 20-30 min to prevent spontaneous crystallization of Rare-Earth element concentrate in solution before insoluble precipitate is separated. Content of sodium in solution is controlled by adding a sodium salt thereto, preferably sodium sulfate or sodium carbonate. Degree of recovery of Rare-Earth Elements from phosphogypsum into concentrate achieves 71.4%. ^ EFFECT: increased degree of Rare-Earth element recovery and simplified procedure due to eliminated operation of dilution of recycle sulfuric acid solutions and shortened sulfuric acid treatment duration by a factor of 2-3. ^ 2 cl, 1 tbl, 3 ex
Zhang Jian-yan - One of the best experts on this subject based on the ideXlab platform.
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Review of Rare Earth Elements in Tea
Guangzhou Chemical Industry, 2015Co-Authors: Zhang Jian-yanAbstract:The Rare Earth is a hotspot among the problems of tea quality and safety in recent years in china,and its limitation standard aroused controversy. Tea plant has an enrichment impact on light Rare Earth element( La,Ce,Y and Nd,etc.),and there is a significant positive correlation between growing of tea leaves and total Rare Earth content. The types of Rare Earth Elements,progress of toxicology research,the residue status and the leaching characteristics in tea were briefly outlined,the source of Rare Earth Elements in tea was investigated preliminarily. The limitation standard of Rare Earth in tea was explored,which provided a reference for scientifically formulate the limitation standard of Rare Earth in tea,strengthened supervision in the future.
Y. Kamimoto - One of the best experts on this subject based on the ideXlab platform.
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Recovery of Rare-Earth Elements from neodymium magnets using molten salt electrolysis
Journal of Material Cycles and Waste Management, 2017Co-Authors: Y. Kamimoto, T. Itoh, K. Kuroda, R. IchinoAbstract:Rare-Earth Elements are used in neodymium magnets, and these Elements are critical to Japanese industry. In this study, we focused on the electrochemical behavior of neodymium magnets for the recovery of Rare-Earth Elements using molten salt electrolysis. The influence of the Rare-Earth elemental composition of the neodymium magnets on their anodic polarization behavior and oxidation mechanism was studied. The use of potentiostatic electrolysis enabled selective leaching of Rare-Earth Elements from neodymium magnets in the potential range from −1.8 to −0.8 V. The oxidation potential limits the oxidation stage, enabling Rare-Earth Elements to be leached from mixed neodymium magnets simultaneously.
