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Ion-selective solar crystallizer with rivulets.

Jihun Choi1, Jaehyun Na1, Sangmin Jeon1

  • 1Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Republic of Korea.

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|June 28, 2023
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Summary

This study introduces an ion-selective solar crystallizer with an asymmetrically corrugated structure (A-SC). The novel A-SC design enhances mineral recovery efficiency and selectivity from brine solutions.

Keywords:
Applied physicsSolar terrestrial physics

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sustainable Technologies

Background:

  • Bulk evaporation of brine offers mineral selectivity but is slow.
  • Solar interfacial evaporation is faster but lacks ion selectivity due to limited re-dissolution.
  • Existing methods struggle to balance speed and selectivity in mineral recovery from brine.

Purpose of the Study:

  • To develop a novel ion-selective solar crystallizer for efficient mineral recovery.
  • To address the limitations of existing solar evaporation techniques in terms of speed and selectivity.
  • To investigate the performance of an asymmetrically corrugated structure (A-SC) for enhanced brine processing.

Main Methods:

  • Design and fabrication of an ion-selective solar crystallizer with an asymmetrically corrugated structure (A-SC).
  • Utilizing the A-SC structure to create V-shaped rivulets for improved solution transport and salt re-dissolution.
  • Testing the A-SC crystallizer with a mixed Na+/K+ ion solution to evaluate evaporation rate and ion selectivity.

Main Results:

  • The A-SC solar crystallizer achieved an evaporation rate of 1.51 kg/m²h.
  • Demonstrated enhanced ion selectivity, with a Na+/K+ concentration ratio 4.45 times higher in the crystallized salt compared to the initial solution.
  • The A-SC structure facilitated efficient solution transport, promoting both evaporation and re-dissolution of salts.

Conclusions:

  • The developed ion-selective solar crystallizer with an A-SC structure offers a promising solution for sustainable and efficient mineral recovery from brine.
  • The A-SC design effectively enhances both evaporation rates and ion selectivity, overcoming limitations of previous solar evaporation methods.
  • This technology presents a significant advancement in solar-driven mineral separation and purification processes.