The study on extraction behavior of [N1888][P507] and TRPO for heavy rare earths

Xu, Huaizhe; Zhang, Li; Pang, Zengrui; Wang, Zhenlei; Li, Weichao; Deng, Jiushuai

doi:10.1016/j.mineng.2021.107339

Cited by 17 publications

(1 citation statement)

References 26 publications

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“…The chemical composition and water quality analysis of real rare earth oxalic acid precipitation mother liquor is shown in Table S1 . Combined with the rare earth industrial production and chemical composition analysis of the effluent shown in Table S1 , it could be inferred that the main impurities, such as the extraction agent (P507 [ 31 ]), heavy metal ions, hydrolysate (2–ethylhexanol, phosphoric acid [ 32 ]), diluent (sulfonated kerosene [ 33 ]), etc., might be contained in real wastewater. Thus, membrane fouling was also investigated when the real rare earth oxalic acid precipitation mother liquor was treated by electrodialysis with the SAEM.…”

Section: Resultsmentioning

confidence: 99%

Separation of Hydrochloric Acid and Oxalic Acid from Rare Earth Oxalic Acid Precipitation Mother Liquor by Electrodialysis

Zhou

et al. 2023

Membranes

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In this study, the hydrochloric acid from rare earth oxalic acid precipitation mother liquor was separated by electrodialysis (ED) with different anion exchange membranes, including selective anion exchange membrane (SAEM), polymer alloy anion exchange membrane (PAAEM), and homogenous anion exchange membrane (HAEM). In addition to actual wastewater, nine types of simulated solutions with different concentrations of hydrochloric acid and oxalic acid were used in the experiments. The results indicated that the hydrochloric acid could be separated effectively by electrodialysis with SAEM from simulated and real rare earth oxalic acid precipitation mother liquor under the operating voltage 15 V and ampere 2.2 A, in which the hydrochloric acid obtained in the concentrate chamber of ED is of higher purity (>91.5%) generally. It was found that the separation effect of the two acids was related to the concentrations and molar ratios of hydrochloric acid and oxalic acid contained in their mixtures. The SEM images and ESD–mapping analyses indicated that membrane fouling appeared on the surface of ACS and CSE at the diluted side of the ED membrane stack when electrodialysis was used to treat the real rare earth oxalic acid precipitation mother liquor. Fe, Yb, Al, and Dy were found in the CSE membrane section, and organic compounds containing carbon and sulfur were attached to the surface of the ACS. The results also indicated that the real rare earth precipitation mother liquor needed to be pretreated before the separation of hydrochloric acid and oxalic acid by electrodialysis.

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Section: Resultsmentioning

confidence: 99%