Extraction of Ce (IV), Yb (III) and Y(III) and recovery of some rare earth elements from Egyptian monazite using CYANEX 923 in kerosene

Aly, M. I.; Masry, B. A.; Gasser, M.S.; Khalifa, N. A.; Daoud, J. A.

doi:10.1016/j.minpro.2016.06.001

Cited by 41 publications

(18 citation statements)

References 15 publications

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“…Acid bake leach and alkaline bake/pug roast leach are efficient processing routes in extracting high percentages of REEs and actinides and have economic advantages [59]. Leach processing is not selective and usually requires a series of downstream separation techniques [59].…”

Section: Beneficiation Of Monazitementioning

confidence: 99%

“…Leach processing is not selective and usually requires a series of downstream separation techniques [59]. Organophosphorus extractants have been extensively employed in the extraction and separation of rare earth elements, and neutral phosphine oxide is the most widely used due to high stability, low aqueous solubility, and rapid phase disengagement [60,61].…”

Section: Beneficiation Of Monazitementioning

confidence: 99%

“…Organophosphorus extractants have been extensively employed in the extraction and separation of rare earth elements, and neutral phosphine oxide is the most widely used due to high stability, low aqueous solubility, and rapid phase disengagement [60,61]. For instance, recent studies have investigated the extraction and separation of La, Ce, Pr, Nd, Sm, Yb, and Y from monazite using CYANEX 923 in kerosene [59,62,63], and detailed recovery processing of REEs from monazite can be found in the work of Aly et al [59]. The extraction process of radioactive elements of Th and U from monazite was investigated by El-Hefny et al [62] and El-Nadi et al [64].…”

Section: Beneficiation Of Monazitementioning

confidence: 99%

“…The extraction process of radioactive elements of Th and U from monazite was investigated by El-Hefny et al [62] and El-Nadi et al [64]. Except for the extremely high Th-monazite, rarely-identified in carbonatite, most REE extraction from monazite in carbonatite-related deposits follow the processing described by Aly et al [59]. Furthermore, Maes et al [65] proposed a two-stage recovery strategy focused on the recovery of Nd and La from monazite that combined microbially based leaching with electro-chemical extraction.…”

Section: Beneficiation Of Monazitementioning

confidence: 99%

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Geochemistry of Monazite within Carbonatite Related REE Deposits

et al. 2017

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Approximately >50% of global rare earth element (REE) resources are hosted by carbonatite related deposits, of which monazite is one of the most important REE minerals. Monazite dominates more than 30 carbonatite-related REE deposits around the world, including currently exploited mineralization at Bayan Obo and Mount Weld. These deposits are widely distributed across all continents, except Antarctica. Though rare, monazite occurs as the primary mineral in carbonatite, and mostly presents as a secondary mineral that has a strong association with apatite. It can partially or completely replace thin or thick overgrowth apatite, depending on the availability of REE. Other mineral phases that usually crystallize together with monazite include barite, fluorite, xenotime, sulfide, and quartz in a carbonate matrix (e.g., dolomite, calcite). This review of monazite geochemistry within carbonatite-related REE deposits aims to provide information regarding the use of monazite as a geochemical indicator to track the formation history of the REE deposits and also supply additional information for the beneficiation of monazite. The chemical compositions of monazite are highly variable, and Ce-monazite is the dominant solid solution in carbonatite related deposits. Most monazite displays steep fractionation from La to Lu, absent of either Eu or Ce anomalies in the chondrite normalized REE plot. The other significant components are huttonite and cheratite. Some rare sulfur-bearing monazite is also identified with an SO 3 content up to 4 wt %. A 147 Sm/ 144 Nd ratio with an average~0.071 for monazite within carbonatite-related ores is similar to that of their host rocks (~0.065), and is the lowest among all types of REE deposits. Sm/Nd variation of monazite from a single complex reflects the differentiation stage of magma, which decreases from early to late. Based on the differences of Nd and Sr abundances, Nd isotopic composition for monazite can be used to track the magma source, whereas Sr isotopic composition records the signatures of the fluid source. Th-(U)-Pb age determination of the secondary monazite records variable thermal or metasomatic disturbances, and careful geochronological interpretation should be brought forward combined with other lines of evidence. ThO 2 is the most difficult contamination in the beneficiation of monazite, luckily, the ThO 2 content of monazite within carbonatite is generally low (<2 wt %).

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Section: Beneficiation Of Monazitementioning

confidence: 99%

Section: Beneficiation Of Monazitementioning

confidence: 99%

Section: Beneficiation Of Monazitementioning

confidence: 99%

Section: Beneficiation Of Monazitementioning

confidence: 99%

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Geochemistry of Monazite within Carbonatite Related REE Deposits

et al. 2017

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“…[1]. Em vista dessa necessidade, muitos esforços foram dedicados ao desenvolvimento de procedimentos de separação eficientes e economicamente viáveis [2][3][4][5][6][7]. propriedades químicas exibidas por essas espécies.…”

Section: Introductionunclassified

Estudo de separação de terras raras por extração líquido-líquido homogênea

Reis¹,

Zamora

Martins

2021

Tecno-log.

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Usando tenoiltrifluoroacetona (HTTA) e o sistema ternário homogêneo de solventes composto por água, etanol e metilisobutilcetona (MIBC), foram estudadas as extrações líquido-líquido homogêneas de Y, La, Ce, Pr, Nd, Sm, Eu, Gd e Dy. Quando trietanolamina (TEA) foi usada para ajustar o pH do sistema ternário homogêneo (pHFU), as curvas de extrações para Eu, La e Pr se posicionaram quase na vertical. As extrações líquido-líquido homogêneas foram realizadas com uma mistura comercial de terras raras. Quando o processo de extração foi realizado em pHFU inferior a 2,5, algumas terras raras foram significativamente enriquecidas.

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Sorption behavior of tungsten and molybdenum on TVEX‐TOPO resin from nitric acid solution

Masry

Daoud

2021

J of Chemical Tech & Biotech

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BACKGROUND TVEX‐TOPO, which is a commercial low‐cost macroporous copolymer resin containing 50% (w% Extractant fraction of total adsorbent mass) trioctylphosphine oxide (TOPO) was used for solid–liquid extraction of tungsten(VI) (W(VI)) and molybdenum(VI) (Mo(VI)) from nitric acid solution. The different parameters affecting the sorption process of both metal ions such as contact time, [HNO3], initial concentrations, V/m ratio and temperature were separately studied. RESULTS The maximum sorption capacity of TVEX‐ TOPO resin was found to be 17.6 mg g−1 Mo(VI) and 10.7 mg g−1 W(VI) after five sorption stages. Thermodynamic parameters ∆H, ∆G, ∆S were found to be −51.7, −4.3 kJ mol−1 and 157 J mol−1 K−1 for Mo(VI) and −27.4, 1 kJ mol−1 and −93 J mol−1 K−1 for W(VI), respectively. The maximum desorption of W(VI) and Mo(VI) of 97.5% was achieved by reductive stripping with 2% and 4% ascorbic acid, respectively. The highest separation coefficient SMo/W was found to be 13.5 and 10 at V/m = 100 and [HNO3] = 0.1 mol L–1. The W(VI)/TVEX‐TOPO system was found to obey the Langmuir isotherm model with regression factor R2 = 0.999 and qm = 10.5 mg g−1, which is close to the maximum sorption capacity, which equals 10.7 mg g−1. Adsorption kinetics results indicated that the pseudo‐first‐order model is more applicable to W(VI) as qe(exp.) = 4.2 mg g−1 is close to qe(cal.) = 4.3 mg g−1, but Mo(VI) was found to fit with the pseudo‐second order‐model. CONCLUSION Recovery of Mo(VI) and W(VI) was applied to dental metal filaments waste of (Co‐Cr‐Mo) alloys using TVEX‐TOPO and a flow sheet describing the proposed process was given. © 2021 Society of Chemical Industry

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Extraction of Ce (IV), Yb (III) and Y(III) and recovery of some rare earth elements from Egyptian monazite using CYANEX 923 in kerosene

Cited by 41 publications

References 15 publications

Geochemistry of Monazite within Carbonatite Related REE Deposits

Geochemistry of Monazite within Carbonatite Related REE Deposits

Estudo de separação de terras raras por extração líquido-líquido homogênea

Sorption behavior of tungsten and molybdenum on TVEX‐TOPO resin from nitric acid solution

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