Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Effect of Precipitation Temperature and Solution pH on the Precipitation of Ammonium Metavanadate

침전온도 및 수용액 pH가 암모늄메타바나데이트 침전반응에 미치는 영향

  • Heo, Seo-Jin (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Kim, Rina (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Chung, Kyeong Woo (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Jeon, Ho-Seok (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Kim, Chul-Joo (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Yoon, Ho-Sung (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
  • 허서진 (한국지질자원연구원 광물자원본부) ;
  • 김리나 (한국지질자원연구원 광물자원본부) ;
  • 정경우 (한국지질자원연구원 광물자원본부) ;
  • 전호석 (한국지질자원연구원 광물자원본부) ;
  • 김철주 (한국지질자원연구원 광물자원본부) ;
  • 윤호성 (한국지질자원연구원 광물자원본부)
  • Received : 2021.09.30
  • Accepted : 2021.11.09
  • Published : 2021.12.31
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Abstract

In this study, the effect of the solubility of ammonium metavanadate and the decomposition ratio of ammonium ions on a precipitation reaction-the precipitation of ammonium metavanadate by adding ammonium chloride to a sodium vanadate solution-was investigated. As the precipitation temperature and pH increased, the decomposition ratio of ammonium ions increased, and the decomposition ratio was greater than 81% at 45 ℃ and pH 9.3. This was approximately four times higher than that at pH 8. The result of the precipitation reaction, in view of these two factors that significantly influence the precipitation reaction, was that the precipitation yield increased as the temperature increased. However, the effect of temperature was not significant above 35 ℃. A kinetic study of the precipitation reaction revealed that the activation energy of the reaction was 42.3 kJ/mol. Therefore, considering the solubility of ammonium metavanadate, the lower the temperature, the better the vanadium recovery yield. Additionally, considering the decomposition of ammonium ions, the lower the pH of the aqueous solution, the more advantageous. However, at pH 8 or less, sodium polyvanadate is precipitated and the purity of vanadium oxide may reduce.

본 연구에서는 소듐바나데이트 수용액에 염화암모늄을 첨가하여 암모늄메타바나데이트를 침전시킬 때, 암모늄메타바나데이트의 용해도와 암모늄이온의 분해율이 침전반응에 미치는 영향을 알아보았다. 침전온도와 수용액 pH가 증가함에 따라 암모늄 이온의 분해율이 증가하였으며 45 ℃에서 수용액 pH 9.3일 때 분해율은 81% 이상으로 pH 8일 때와 비교하였을 때 약 4배 정도 증가하였다. 그러므로 침전 반응에 큰 영향을 미치는 침전온도와 수용액 pH 두 인자를 고려하여 침전반응을 수행한 결과, 침전온도가 증가함에 따라 침전속도가 증가하였으나 35 ℃ 이상에서는 침전온도의 영향이 크지 않았다. 침전반응 속도론적 고찰을 통하여 얻은 침전반응의 활성화 에너지는 42.3 kJ/mol이었다. 이와 같은 연구를 통하여 암모늄메타바나데이트의 용해도를 고려하였을 때 침전온도는 낮을수록 바나듐 회수율에 유리하였다. 또한 암모늄 이온의 분해를 고려하였을 때 수용액의 pH는 낮을수록 유리하나 pH 8 이하에서는 소듐폴리바나데이트가 침전되며 바나듐 산화물의 순도 저하가 야기될 수 있었다.

Keywords

Acknowledgement

본 연구는 산업통상자원부(MOTIE)와 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구 과제입니다(과제명: 국내 바나듐함유광으로부터 바나듐광 스마트 개발 및 원료화 기술개발, 과제번호: 20216110100040, 주관기관: 삼양리소스).

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