Precipitation Behaviors of Fission Products by Phosphate Conversion in LiCl-KCl Medium

Amamoto, Ippei; Kofuji, Hirohide; Myochin, Munetaka; Takasaki, Yasushi; Yano, Tetsuji; Terai, Takayuki

doi:10.13182/nt10-a10867

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…A number of mixtures of alkali chlorides are considered as possible solvents for the reprocessing technology and these include 3LiCl-2KCl, NaCl-2CsCl and NaCl-KCl-CsCl eutectics as well as NaCl-KCl equimolar mixture. Formation of rare earth phosphates was studied in several alkali chloride melts including 3LiCl-2KCl, NaCl-KCl and NaCl-2CsCl (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). In the presence of lithium ions in the melt only normal rare earth orthophosphates (REPO 4 ) were formed and excess phosphate added was converted to sparingly soluble Li 3 PO 4 .…”

Section: Introductionmentioning

confidence: 99%

Formation of Rare Earth Phosphates in the Melts Based on NaCl–KCl Equimolar Mixture

et al. 2018

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Reaction of solutions of rare earth chlorides in NaCl–KCl melt with sodium orthophosphate was studied at 750 oC. The rare earths investigated included yttrium, lanthanum and all lanthanides apart from promethium. The initial PO4 3– : RE3+ mole ratio varied from 0.3 to 10 and the excess of phosphate required for the complete conversion of RECl3 to phosphate as well as phase composition of the phosphates produced were determined. At PO4 3– : RE3+ mole ratios below five only normal REPO4 phosphates were formed, while at the ratios above 5 double Na3RE(PO4)2 and/or K3RE(PO4)2 phosphates were produced. Precipitation of a mixture of rare earths in the proportion simulating their abundance in the spent nuclear fuel was also investigated. Particle size of the phosphates formed was determined and this varied from 0.1 to hundredths of microns. Increasing the initial PO4 3– : RE3+ mole ratio resulted in increasing particle size.

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Section: Introductionmentioning

confidence: 99%

Formation of Rare Earth Phosphates in the Melts Based on NaCl–KCl Equimolar Mixture

et al. 2018

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“…Formation of f-element phosphates was studied in a number of chloride melts including individual NaCl and KCl as well as the mixtures 3LiCl-2KCl, NaCl-KCl and NaCl-2CsCl (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). In these studies the attention was mostly paid to the chemistry of the process and phase composition of the produced RE phosphates.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of Rare Earth Phosphates from Molten Salts: Particle Size Distribution Analysis

et al. 2016

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Particle size distribution of phosphates of 13 rare earth elements formed in NaCl–2CsCl eutectic based melts at 650 oC was determined. Sodium orthophosphate was used as a precipitant. Initial phosphate-to-rare earth molar ratio in the reaction mixture corresponded to 50 and 100 % degree of precipitation. Particles in the powders obtained after aqueous treatment of quenched melts tend to agglomerate and ultrasonic treatment was employed in the particle size measurements. Normally particles of the phosphates have a size of 0.1–100 μm. The position of the maxima in PSD curves depends on the nature of RE element. In addition, precipitation of mixtures of RE elements mimicking their content in spent nuclear fuels was investigated in NaCl–2CsCl (at 650 oC) and NaCl–KCl (at 750 oC) melts.

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“…The precipitation of f-element phosphates from molten salts has been investigated in a range of fused alkali chlorides. The elements studied included uranium, plutonium, americium, curium, and the lanthanides (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). A range of phosphates (sodium, potassium, lithium and ammonium) were employed as precipitants.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of Rare Earth Phosphates from NaCl-2CsCl Eutectic Based Melts

et al. 2013

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The reaction between 15 rare earth chlorides (yttrium, lanthanum and all the lanthanides except for promethium) and sodium orthophosphate was studied in NaCl-2CsCl eutectic based melts between 550 and 750 oC under an inert atmosphere. Rare earth phosphates were precipitated from the melt and their composition determined from chemical analysis, vibrational spectroscopy and X-ray powder diffraction measurements. The effects of temperature and the initial phosphate-to-rare earth mole ratio in the melt on the phase composition of the precipitated phosphates was investigated Over 99.9% precipitation could be achieved and the mole ratio required varied between 2 and 6. The minimum excess of phosphate precipitant required for complete precipitation from the melt was determined.

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Precipitation Behaviors of Fission Products by Phosphate Conversion in LiCl-KCl Medium

Cited by 11 publications

References 6 publications

Formation of Rare Earth Phosphates in the Melts Based on NaCl–KCl Equimolar Mixture

Formation of Rare Earth Phosphates in the Melts Based on NaCl–KCl Equimolar Mixture

Precipitation of Rare Earth Phosphates from Molten Salts: Particle Size Distribution Analysis

Precipitation of Rare Earth Phosphates from NaCl-2CsCl Eutectic Based Melts

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