Extraction of rare-earth elements by alkylated dibenzo-18-crown-6 and dicyclohexano-18-crown-6 from acid solutions

Demin, S. V.; Zhilov, V. I.; Tsivadze, А. Yu.; Yakshin, V. V.; Vilkova, O. N.; Царенко, Н. А.

doi:10.1134/s0036023606100275

Cited by 14 publications

(4 citation statements)

References 3 publications

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“…Such operations limit the availability of crown ethers as extractants for REE on a commercial scale [16]. Besides, there is data about their poor effectiveness in acidic solutions with low pH values [17].…”

Section: Selection Of the Extractantmentioning

confidence: 99%

Increasing the depth of apatite processing by extracting rare-earth elements

Lukyantseva

Сергеев

2021

E3S Web Conf.

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Currently, most high-technology productions are impossible without rare-earth elements (REE). The heavy rare-earth elements are of great interest as they have the highest market value and are in demand in the vast majority of knowledge-intensive industries. The main recourse of REE in Russia is apatite ore which is used in the production of fertilizers. As a result of its leaching, about 15-20% of REE goes to wet-process phosphoric acid. To enhance the depth of apatite processing, it is necessary to develop a technology which will allow obtaining rare-earth elements as by-products. The method of extraction and concentration of REE discussed in this paper was conducted by using the extractant based on di-(2-ethylhexyl) phosphoric acid (D2EHPA). The mechanism of extraction was studied, as well as the impact of the extractant concentration, phase ratio and the number of stages on the extraction process.

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Section: Selection Of the Extractantmentioning

confidence: 99%

Increasing the depth of apatite processing by extracting rare-earth elements

Lukyantseva

Сергеев

2021

E3S Web Conf.

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“…Это объяснимо с точки зрения жесткости структуры молекулы, которую прида-ют молекулам краун-эфиров циклогек-сильные и ароматические фрагменты. S. V. Demin и коллеги провели ряд исследований экстракции алкилиро-ванными производными краун-эфи-ров 5 и 6 из кислых растворов в систе-ме хлороформ/вода [9]. Показано, что экстракция катионов редкоземельных металлов дициклогексано-18-краун-6-эфиром 2 и его алкилированными производными в присутствии трих-лоруксусной кислоты является более эффективной, чем с использованием азотной или уксусной кислот.…”

Section: краун-эфиры как экстрагенты катионов рзмunclassified

“…На основе поданда с открытыми полиэфирными цепочками 25, анало-гично, как и в случае с краун-эфиром 7-9, можно получить полимер 26-28 для экстракции катионов РЗМ в систе-ме твердая фаза-жидкость [9]. Однако, в отличие от краун-эфирсодержащих полимеров, полимеры, содержащие поданды, способны к более эффектив-ной экстракции лантаноидов в воде.…”

Section: поданды как экстрагенты для катионов рзмunclassified

“…V. Demin and colleagues conducted the series of studies on the extraction of alkyl derivatives by crown ethers 5 and 6 from acidic solutions in the system chloroform/water [9]. It is shown that extraction of cations of rare earth metals by dicyclohexano-18-crown-6-ether 2 and its alkyl derivatives in the presence of trichloroacetic acid is more effective than with nitric or acetic acids.…”

Section: Crown Ethers As Extractants Of Rare Earth Metals Cationsmentioning

confidence: 99%

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Extractants for rare earth metals

2016

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The separation of trivalent rare earth metals is perhaps the most serious challenge associated with a closed fuel cycle. The choice of ligand as extractant, which must be selective and efficient in conditions of high radiation environment, plays an important role. In this review there are the main examples of extractants for f-elements used in the present 10-20 years. Экстрагенты для редкоземельных металловРазделение трехвалентных редкоземельных металлов, возможно, является самым се-рьезным вызовом, связанным с замкнутым топливным циклом. Важную роль играет выбор лиганда в качестве экстрагента, который должен быть селективным и надежным в условиях повышенной радиации среды. В данном обзоре приведены основные примеры экстрагентов для f-элементов, применяющихся в последнии 10-20 лет.Ключевые слова: редкоземельные металлы; фосфорорганические соединения; краунэ-фиры; поданды; каликсарены; амиды дигликолевой кислоты.

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A Review on Application of Crown Ethers in Separation of Rare Earths and Precious Metals

Lakshmanan

Vijayan

2018

The Minerals, Metals &Amp; Materials Series

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Extraction of rare-earth elements by alkylated dibenzo-18-crown-6 and dicyclohexano-18-crown-6 from acid solutions

Cited by 14 publications

References 3 publications

Increasing the depth of apatite processing by extracting rare-earth elements

Increasing the depth of apatite processing by extracting rare-earth elements

Extractants for rare earth metals

A Review on Application of Crown Ethers in Separation of Rare Earths and Precious Metals

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