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1

Applicability Study of Co and Eu Extraction Using Solvent from Ca Rich HCl Solution

Oh Maengkyo, Lee Keunyoung, Foster Richard I., Kim Ik-Soo, Lee Chang-Ha

Archives of Metallurgy and Materials

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2023

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Vol. 68, iss. 1

123--126

EN

This study was conducted to treat radioactive acidic wastewater, which contained radioactive 60Co and 152Eu. The wastewater can be generated during a decommissioning project to reduce the volume of radioactive concrete waste from nuclear facilities. With a variety of methods for separating the radioactive nuclides available, we evaluated the separation applicability of the solvent extraction method. From our results, Co and Eu could be easily extracted from the Ca rich wastewater using Cyanex301 (Co extraction (%) 99.8, Eu extraction (%) 99.6) without Ca extraction. On the other hand, Eu could be selectively separated by Cyanex272 (Eu extraction (%) 99.1) without Co and Ca extraction at pH 2~3. Therefore, the extraction method can be tailored according to the target radionuclides present in the wastewater and be selectively applied to the overall treatment process. By extracting radioactive Co and Eu from acidic wastewater to below the discharge criteria, treated wastewater could be regarded as non-radioactive industrial waste, to be economically and easily handled. Moreover, it may be possible to reuse separated Co and Eu for research and industrial applications by realizing waste valorization.

2

Application of Plasticized Cellulose Triacetate Membranes for Recovery and Separation of Cerium(III) and Lanthanum(III)

Pospiech Beata, Makowka Adam

Autex Research Journal

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2022

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Vol. 22, no. 3

312--317

EN

This work explains the application of plasticized cellulose triacetate (CTA) membranes with Cyanex 272 di(2,4,4-(trimethylpentyl)phosphinic acid) and Cyanex 301 (di(2,4,4-trimethylpentyl)dithiophosphinic acid) as the ion carriers of lanthanum(III) and cerium(III). CTA is used as a support for the preparation of polymer inclusion membrane (PIM). This membrane separates the aqueous source phase containing metal ions and the receiving phase. 1M H2SO4 is applied as the receiving phase in this process. The separation properties of the plasticized membranes with Cyanex 272 and Cyanex 301 are compared. The results show that the transport of cerium(III) through PIM with Cyanex 272 is more efficient and selective than lanthanum(III).

3

Facilitated transport of germanium from acidic medium through supported liquid membrane using Cyanex 301 as mobile carrier

Kamran Haghighi Hossein, Irannajad Mehdi, Moradkhani Davood

Physicochemical Problems of Mineral Processing

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2019

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Vol. 55, iss. 1

225--236

EN

In this research, a flat sheet supported liquid membrane (FSSLM) system was used to transfer germanium from the acidic medium. The poly-tetra fluoro ethylene (PTFE) membrane filter with the hydrophobic nature and Cyanex 301 were selected as the support and the mobile carrier, respectively. The influence of various parameters being pH of the feed solution (1.5-5), germanium concentration (10-40 mg/dm3), carrier concentration in the solid membrane (10-40 vol%), and sulfuric acid concentration of the receiving phase (100-400 g/dm3) was investigated on the transport of germanium. Under the optimum condition being pH of 1.5, the germanium concentration of 40 mg/dm3, the carrier concentration of 1.18 mol/dm3, and the sulfuric acid concentration of 400 g/dm3, a mass transfer model was developed. Based on this model, the transport mechanism, diffusion of species to the feed-membrane interface, the chemical reaction of species and Cyanex 301, and diffusion of germanium-Cyanex 301 complexes across SLM were explained. According to the obtained model, the values of 6.57 and 738.6 s/cm were achieved for the aqueous and organic diffusion resistances, respectively.

4

Hydrometallurgical recovery of cobalt(ii) from acidic chloride solutions by transport through polymer inclusion membranes

Pospiech B.

Physicochemical Problems of Mineral Processing

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2013

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Vol. 49, iss. 2

641--649

EN

In this work a selective transport of Co(II) and Li(I) ions from acidic chloride solutions through polymer inclusion membranes (PIMs) with Cyanex 301 has been studied. The effect of composition of the polymer membrane has been investigated. The obtained results show that around 98% of Co(II) was transported from the source phase containing 0.01 M Co(II) and 0.01 M Li(I) at pH 4.0 through PIM after 12 h into 3.0 M HCl. The membrane containing 18 wt.% cellulose triacetate (CTA), 32 wt.% Cyanex 301 and 50 wt.% o-nitrophenyl octyl ether (ONPOE) showed very good stability, suggesting that there is a possibility of application of the membrane for Co(II) recovery from acidic leach liquor solutions of spent lithium ion batteries (LIBs).

5

Transport of transition metal ions through polymer inclusion membranes with Cyanex 301

Ulewicz M.

Ars Separatoria Acta

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2004

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No. 3

81-88

EN

The selective transport of zinc(II) and cadmium(II) ions from aqueous chloride or sulfate source phase through polymer inclusion membranes (PIM) containing cellulose triacetate (support), o-nitrophenyl pentyl ether (plasticizer) and di(2,4,4-trimethylpentyl)dithiophosphinic acid - Cyanex 301 (ion carrier) is shown. Zn(II) and Cd(II) ions can be effectively removed from dilute chloride and sulfate aqueous solutions into 1.0 M HCl or H2SO4 as the receiving phase. The separation coefficients were practically constant for acid concentrations in the receiving phase ranging from 0.01 to 1.0 M Copper(II), zinc(II), cadmium(II), cobalt(II), and nickel(II) ions removal from aqueous chloride solutions in transport through PIMs is also shown. These metal ions can be effectively removed from dilute aqueous chloride solutions in transport through PIMs with di(2,4,4-trimethylpentyl)dithiophosphinic acid as the ionic carriers into 1.0 M HCl. The selectivity coefficients of Cu(II) over Zn(II), Cd(II), Co(II) and Ni(II) were low and decreased with an increase in the pH of source aqueous phase.

6

Ekstrakcyjne wydzielanie arsenu z roztworów kwasu siarkowego Cyanexem 925 i jego mieszaniną z Cyanexem 301.

Iberhan L., Wiśniewski M.

Prace Naukowe Instytutu Technologii Nieorganicznej i Nawozów Mineralnych Politechniki Wrocławskiej. Konferencje

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2000

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Vol. 48, nr 28

182-185

PL

Do badań ekstrakcyjnych arsenu (III) i (V) zastosowano Cyanex 925 oraz jego mieszaninę z Cyanexem 301. Badania ekstrakcji arsenu (III) i (V) wyżej wymienionymi ekstrahentami wykazują, że stan równowagi procesu ustala sie szybko już po 5 minutach mieszania faz. Ekstrahenty rozcieńczono toluenem. Cyanex 925 lepiej ekstrahuje As(V) niż As(III). Mieszanina Cyanexu 925 i Cyanexu 301 bardzo dobrze usuwa arsen z fazy wodnej, a maksymalna ilość arsenu III) i (V) przeniesiona do fazy organicznej wynosi 98%. Zwiększenie stężenia kwasu siarkowego w roztworze wyjściowym powoduje wzrost wydajności ekstrakcji arsenu III) i (V).

EN

The aim of this work is the studies of extraction equilibrium in systems containing arsenic III) and (V) in sulphuric acid solution. Arsenic (III) and (V) extraction was carried out typically in dysperse system using equal volumes of the aqueous and organic phases at 50 degrees C. Bis(2,4,4-trimetylpentyl)octylphosphine oxide (Cyanex 925) dissolved in toluene and bis(2,4,4-trimethylpentyl)dithiophosphinic acid (Cyanex 301) dissolved in toluene were used. The obtained results demonstrate that the mixture of Cyanex 925 and Cyanex 301 dissolved in toluene can efficiently extract arsenic (III) and (V) from aqueous sulphuric acid solution. The extraction of arsenic (III) and (V) with Cyanex 925 and Cyanex 301 is fast and equilibrium is obtained after 5 minutes. The extraction of As(III) and As(V) increases with increasing of sulphuric acid concentration in feed solution.