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Influence factor of Pr(III) recovery kinetics from rare-earth simulant wastewater by PAN microtubule hyperfiltration reactor

  • Liang Pei EMAIL logo and Liming Wang
Published/Copyright: August 22, 2022

Abstract

PAN microtubule hyperfiltration reactor (PMHR) with organic phosphate system containing simulant wastewater section with buffer solution acetic acid and enrichment section with nitric acid solution and organic phosphate C16H35O4P (Di (6-methylheptyl) phosphate) dissolved in benzin, has been studied for the praseodymium (III)[expressed as Pr(III) or Pr3+] recovery in the rare-earth simulant wastewater. Many factors of Pr(III) recovery using PMHR need to explore, including hydrogen ion concentration (or pH), cinit of Pr(III) and different ionic strength of rare-earth simulant mine wastewater, volume ratio of C16H35O4P with benzin and nitric acid solution (O/W), nitric acid concentration, C16H35O4P concentration, different acid solution of enrichment section on Pr(III) recovery with PMHR were investigated. The experimental results show that the best recovery conditions of Pr(III) were obtained as that nitric acid concentration was 4.00 mol/L, C16H35O4P concentration was 0.200 mol/L, and O/W was 0.6 in the enrichment section, and pH value was 4.90 in the wastewater section. Ionic strength of rare-earth simulant mine wastewater had no obvious effect on Pr(III) recovery. When cinit of Pr(III) concentration was 1.67 × 10−4 mol/L, the recovery percentage of Pr(III) was up to 94.7% in 160 min. The kinetic equations were developed, and diffusion coefficient in the microtubule reactor and thickness of diffusion layer between the wastewater section and the microtubule pipe wall were obtained by linear slope method. They were 4.16 × 10−6 m2/s and 4.65 μm, respectively. PMHR, owing to a large number of C16H35O4P was used in the enrichment section, can renewal the losing carrier of microtubule reactor. As a result, the recovery percentage of Pr(III) was increased, the stability of PMHR system was enhanced, and the life span of the PMHR system was extended.


Corresponding author: Liang Pei, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi of Xinjiang, 830011, China; Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; and University of Chinese Academy of Sciences, Beijing, 100049, China, E-mail:

Award Identifier / Grant number: 51009126

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: Independent Research Projects of Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences (E2500201) and the National Youth Science Foundation (51009126).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-07-04
Accepted: 2022-07-29
Published Online: 2022-08-22

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