Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Aqueous Chemistry of Molybdenum

몰리브덴의 용액화학

  • Lee, Man Seung (Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University) ;
  • Choi, Seung Hoon (Department of Chemical and Biomolecular Engineering, Seonam University)
  • 이만승 (목포대학교 신소재공학과 희유금속연구소) ;
  • 최승훈 (서남대학교 생명화학공학과)
  • Received : 2018.07.02
  • Accepted : 2018.07.20
  • Published : 2018.08.31
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Abstract

$MoO{_4}^{2-}$ is the stable chemical species of Mo(VI) in alkaline solution. In the pH range of 2 to 6, condensation polymerization between $MoO{_4}^{2-}$ and hydrogen ion results in the formation of various polyanions of Mo(VI). Polycations of Mo(VI) begin to form when solution pH is less than 2. As the concentration of inorganic acid increases, polycations of Mo(VI) can react with the anion of the inorganic acid, resulting in the formation of heteranions of Mo(VI). The distribution of Mo(VI) species at pH < 6 depends on the concentration of Mo(V) and inorganic acid. In order to analyze the solvent extraction and ion exchange data on Mo(VI) from concentrated inorganic acid solution, it is necessary to elucidate the nature of Mo(VI) complexes.

몰리브덴은 알칼리용액에서는 $MoO{_4}^{2-}$로 존재한다. 수용액의 pH 2와 6 사이의 범위에서는 $MoO{_4}^{2-}$와 수소이온간의 축중합반응에 의해 다양한 동종다중음이온이 형성된다. 몰리브덴용액의 pH가 2 이하의 범위에서는 동종다중양이온이 형성되나 무기산의 농도가 증가함에 따라 무기산의 음이온과 반응하여 이종다중음이온이 형성된다. pH 6 이하의 용액에서 몰리브덴의 농도분포는 몰리브덴과 무기산의 종류와 농도에 의존한다. 따라서 용매추출과 이온교환자료를 해석하기 위해서는 강산용액에서 몰리브덴 화학종을 규명할 필요가 있다.

Keywords

References

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