Selective preparation of neodymium phosphates from iron mixed solution by two-step precipitation

Onoda, Hiroaki; Iinuma, Atsuya

doi:10.1016/j.jece.2020.104083

Cited by 10 publications

(2 citation statements)

References 23 publications

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“…The precipitation method has the advantages of wide sources of chemicals, low price, simple operation, and reliable treatment. Onoda et al 17 selectively precipitated neodymium phosphate from an aqueous solution of iron–neodymium mixture to separate neodymium and iron without the use of high temperature or specialized equipment. Liu et al 18 removed and recovered fluoride and phosphate by the stepwise precipitation method, which not only achieved the efficient removal and recovery of F and P but also separated them.…”

Section: Introductionmentioning

confidence: 99%

Recyclable and Efficient Recovery of Ca and S from Phosphogypsum by Using Multistep Precipitation

Zhou,

Liu

et al. 2024

ACS Omega

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The resource utilization of phosphogypsum (PG) is the key to promote the green development of the phosphorus chemical industry. The natural environment and public safety are significantly threatened by the enormous volume of PG storage. In this study, Ca and S were successfully recovered from the PG via a multistep precipitation in the NaOH−BaCO 3 system. The alkali solution can be recycled five times, with a first recovery ratio of about 97.9%, and the decomposition ratio of PG remained above 70% after five cycles. In addition, the recovery ratios of Ca and S in PG are 99.9 and 82.5%, respectively. The product of BaSO 4 can be used as a weighting agent for oil and natural gas drilling mud. The BaSO 4 can also be used as wave-absorbing materials, and its reflection loss value reaches 97.8% of the analytical purity BaSO 4 . This work provides a new idea for the efficient recycling of Ca and S in PG with an outstanding application prospect.

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Section: Introductionmentioning

confidence: 99%

Recyclable and Efficient Recovery of Ca and S from Phosphogypsum by Using Multistep Precipitation

Zhou,

Liu

et al. 2024

ACS Omega

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“…[3][4][5] In this regard, finding efficient mechanisms and techniques for their extraction from aqueous solutions has attracted great attention in these days. There are several methods for the recovery/removal of rare earths from different aqueous solutions, including ion exchange, [6] precipitation, [7,8] adsorption, [9,10] membrane separation, [11] and solvent extraction. [12,13] Due to the requirement for high purity neodymium, solvent extraction method is progressively applied to replace precipitation in unit operations of metallurgy due to sludge production.…”

Section: Introductionmentioning

confidence: 99%

Synergistic solvent extraction of neodymium form nitric acid medium using Cyanex 302 and D2EHPA

Allahkarami

Rezai

Bozorgmehr

et al. 2021

Zeitschrift anorg allge chemie

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In this research, a binary mixture of Cyanex 302 (bis-2,4,4 trimethylpentyl monothiophosphinic acid) and D2EHPA (di-2ethylhexyl phosphoric acid) in kerosene was used for extracting neodymium from nitric acid medium. The different variables affecting the extraction of Nd(III) such as contact time, solution acidity, extractant concentration, and temperature were investigated. Stripping of neodymium ions from the loaded organic phase using HCl, HNO3, and H 2 SO 4 for the re-extraction of neodymium was also carried out. Results indicated that the most efficient reagent for the stripping of neodymium was nitric acid. The extraction reaction of neodymium with the synergistic mixture was determined using graphical method to be NdH 5 A 2 B 6 . The organo-metallic complex containing neodymium was examined by Fourier Transform Infrared Spectroscopy (FT-IR). The values of stoichiometric coefficients and thermodynamic parameters were calculated for this mixture. The extraction was an endothermic process, and the thermodynamic functions, ΔH and ΔS were determined to be 10.532 kJ/ mol and À 123.681 j/mol°K, respectively for the system under study. The Cyanex 302 + D2EHPA system not only increased the extraction efficiency of neodymium but also improved the selectivity significantly. The separation factor of neodymium and praseodymium suggested that this mixture would be of practical value in the separation of neodymium.

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Surveying the elimination of hazardous heavy metal from the multi-component systems using various sorbents: a review

Masoumi

Ghaemi

Gilani

2022

J Environ Health Sci Engineer

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Selective preparation of neodymium phosphates from iron mixed solution by two-step precipitation

Cited by 10 publications

References 23 publications

Recyclable and Efficient Recovery of Ca and S from Phosphogypsum by Using Multistep Precipitation

Recyclable and Efficient Recovery of Ca and S from Phosphogypsum by Using Multistep Precipitation

Synergistic solvent extraction of neodymium form nitric acid medium using Cyanex 302 and D2EHPA

Surveying the elimination of hazardous heavy metal from the multi-component systems using various sorbents: a review

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