Continuous Liquid-Liquid Extraction of Uranium from Uranium-containing Wastewater Using an Organic Phase-refining-type Emulsion Flow Extractor

Nagano, Tetsushi; Naganawa, Hirochika; Suzuki, H.; Toshimitsu, Masaaki; Mitamura, Hisayoshi; Yanase, Nobuyuki; Grambow, Bernd

doi:10.2116/analsci.18n002

Cited by 12 publications

(4 citation statements)

References 21 publications

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“…A novel operation mode of extraction, "emulsion-flow" allows for both stable counter-current operation and a high extraction ratio [1][2][3][4][5]. The method is characterized by supplying aqueous and organic phases in the form of droplets with uniformly controlled sizes.…”

Section: Introductionmentioning

confidence: 99%

Axial Mixing in Emulsion-flow Column under Iodine Extraction

Hirayama

Goshima

Mizuta

et al. 2021

SERDJ

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Strength of axial mixing in the emulsion phase during the progress of extraction was evaluated using the Peclet number under various flow conditions. The Peclet numbers were determined with the established tracer technology which applies inert species for iodine extraction. Very little effect of operating velocities of either aqueous and organic phases was found on the Peclet numbers. This fact indicates that an almost constant degree of axial mixing was kept in this column for different flow velocities of both phases. Furthermore, the degree of axial mixing of the emulsion-flow column was compared with conventional spray and packed columns by plotting the droplet Peclet number against the droplet Reynolds number. Points of the Peclet numbers of emulsion-flow column located in the middle of the spray and the packed columns, which suggests that the strength of axial mixing in the present column is in between spray and packed columns.

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Section: Introductionmentioning

confidence: 99%

Axial Mixing in Emulsion-flow Column under Iodine Extraction

Hirayama

Goshima

Mizuta

et al. 2021

SERDJ

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“…Emulsion-flow columns are a novel type of extraction equipment that is gaining interest due to their extraction efficiency. Their remarkably stable counter-current operation is maintained by supplying droplets of aqueous and organic liquid into the column [1][2][3][4][5] . Stability is maintained even when feeding crude materials containing Al2O3 particles of approximately 20 to 25 micrometer in diameter 2 .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mass-transfer Performance of Emulsion-flow Column with Height of Transfer Unit (HTU) and Number of Theoretical Plates, and Comparison of HTU with Column-type Extractors

et al. 2020

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The performance of iodine extraction in the emulsion-flow column was evaluated using an indicator of difficulty in separation, height of transfer unit, HTU and of the number of theoretical plates, Nth. Resulting HTU values ranged from 0.15 to 0.78 m and Nth changed from 0.58 to 1.3. HTU values were formulated in accordance with operating liquid velocities. Despite a 30% margin of error, HTU values were found to be useful in predicting column performance. Observed HTU values were compared with those of conventional extraction columns with or without mechanical agitation. The emulsion-flow column meets the top-level performance of extractors without mechanical agitation, such as packed and spray columns, and performs in the middle range of agitated extractors, although these sacrifice the structure simplicity to assure stable counter-current operation. The advantage of the emulsion-flow column is better HTU values with stable counter-current operation in a simple column structure.

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“…Recently, a new liquid-liquid extraction method, called the "emulsion flow" method, was developed at Japan Atomic Energy Agency (JAEA). [1][2][3][4][5][6][7][8][9][10] The emulsion flow method, due to the lowest cost, the easiest handling, the highest level in efficiency, compactness and safety, compared with conventional methods, mixer-settler, pulse column, spray column, centrifugal extractor, etc., and eco-friendliness, has attracted attention in industries, and has been expected to bring innovation to liquidliquid extraction technologies. 11 An apparatus based on the emulsion flow method can realize ideal liquid-liquid extraction with its high ability for two-liquidphase mixing to reach an emulsion by spraying micrometersized droplets of an organic phase into the counter-current flow of an aqueous phase by only feeding solutions.…”

Section: Introductionmentioning

confidence: 99%

Size Distribution of Droplets in a Two Liquid-phase Mixture Compared between Liquid Spraying and Mechanical Stirring

et al. 2019

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A new liquid-liquid extraction method, called the "emulsion flow" method, is expected to realize an ideal liquid-liquid extraction by controlling the emulsion generation and separation using liquid spraying, only by solution sending. In order to understand the mechanism of emulsion control in the emulsion flow method, the size distribution of droplets in two liquid-phase mixtures was compared by using originally designed apparatuses 1) for the case of liquid spraying and 2) for the case of mechanical stirring. We demonstrated that the size distribution of droplets generated near a mixing device (a nozzle for liquid spraying or an impeller head for mechanical stirring) determines the phase-separation property.

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Continuous Liquid-Liquid Extraction of Uranium from Uranium-containing Wastewater Using an Organic Phase-refining-type Emulsion Flow Extractor

Cited by 12 publications

References 21 publications

Axial Mixing in Emulsion-flow Column under Iodine Extraction

Axial Mixing in Emulsion-flow Column under Iodine Extraction

Evaluation of Mass-transfer Performance of Emulsion-flow Column with Height of Transfer Unit (HTU) and Number of Theoretical Plates, and Comparison of HTU with Column-type Extractors

Size Distribution of Droplets in a Two Liquid-phase Mixture Compared between Liquid Spraying and Mechanical Stirring

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