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금속회수공정에서 발생되는 Na2SO4 폐액으로 부터 NaOH 및 H2SO4 재생을 위한 Electro-membrane 응용

Application of Electro-membrane for Regeneration of NaOH and H2SO4 from the Spent Na2SO4 Solutions in Metal Recovery Process

김기훈|안재우|조연철
한국자원리싸이클링학회|2022.10|자원리싸이클링 (Resources Recycling)|제31권 제5호|pp. 3-19|DOI 10.7844/kirr.2022.31.5.3

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참고문헌

키워드

ElectrodialysisNa2SO4전기분리막전기투석바이폴라전기투석황산나트륨(망초)폐수무방류Electro-membraneBipolar-electrodialysisZero Liquid Discharge (Z.L.D.)
주제분류자원공학

초록

전기막(Electro-membrane) 기술은 전기투석(ED) 및 바이폴라 전기투석(BMED)과 같이 선택적 투과성을 갖는 이온교환막을 사용하여 전기에너지에 의하여 수용액 내의 물질을 분리·정제하는 공정이다. 전기막(Electro-membrane) 기술은 공정 중에 부산물이 발생하지않고 회수된 염기나 산을 공정 중에 재사용할 수 있어 환경 친화적인 기술로 주목받고 있다. 본고에서는 전기분리막 기술인 ED와 BMED 기술의 원리 및 셀(Cell) 구성에 따른 여러 가지 특성 및 문제점 등에 대해 조사하고, 특히 금속회수 공정 중 다량 발생되고 있는 황산나트륨(Na2SO4) 폐액 처리와 관련된 연구사례들을 조사·분석하였다.

Abstract

Electro-membrane technology is a process for separating and purifying substances in aqueous solution by electric energy using an ion exchange membrane with selective permeability, such as electrodialysis (ED) and bipolar electrodialysis (BMED). Electro-membrane technology is attracting attention as an environmental friendly technology because it does not generate by-products during the process and the recovered base or acid can be reused during the process. In this paper, we investigate the principles of ED and BMED technologies and various characteristics and problems according to the cell configuration. In particular, by investigating and analyzing research cases related to the treatment of waste sodium sulfate (Na2SO4), which is generated in large amounts during the metal recovery process.

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