Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Solvent Extraction of Mo(VI) and W(VI) from Dilute Chloride Solution by Amine and Neutral Extractants

묽은 염산용액에서 아민과 중성추출제에 의한 몰리브덴(VI)과 텅스텐(VI)의 용매추출

  • Le, Minh Nhan (Department of Advanced Materials Science & Engineering, Mokpo National University) ;
  • Son, Seong Ho (Korea Institute of Industrial Technology, Incheon Technology Service Centre) ;
  • Lee, Man Seung (Department of Advanced Materials Science & Engineering, Mokpo National University)
  • Received : 2018.12.13
  • Accepted : 2019.01.10
  • Published : 2019.02.28
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Abstract

The extraction behavior of Mo(VI) and W(VI) from dilute chloride solution was investigated by employing amine (Alamine308 and TEHA) and neutral extractants (TOP) in the solution pH range from 2 to 9. W (VI) was selectively extracted over Mo(VI) by these three extractants and TEHA led to the highest separation factor. Without the pretreatment protonation of the tertiary amines, the extraction percentage of the two metal ions decreased steadily to zero as solution pH increased to 9. The extraction behavior of the metals was discussed on the basis of the distribution diagram of each metal. Alamine 308 and TEHA were much better than TOP in extracting and separating the two metal ions.

묽은 염산용액의 pH를 2에서 9까지 변화시켜 아민계(Alamine 308과 TEHA)와 중성추출제(TOP)로 몰리브덴(VI)과 텅스텐(VI)의 용매추출거동을 조사하였다. 텅스텐(VI)이 몰리브덴(VI)보다 상기 세 추출제에 선택적으로 추출되었으며, TEHA로 추출시 가장 높은 분리인자를 얻었다. 수소화처리하지 않은 3차 아민에 의한 두 금속의 추출율은 용액의 pH에 따라 지속적으로 감소하여 pH 9에서는 전혀 추출되지 않았다. 본 논문의 실험조건에서 용매추출거동을 금속의 농도분포곡선을 이용하여 설명하였다. Alamine 308과 TEHA는 TOP에 비해 두 금속의 추출과 분리에 효과적이다.

Keywords

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Fig. 1. Distribution diagram of molybdenum (VI) species in aqueous solution as a function of pH. [Mo]total = 0.01 M.

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Fig. 2. Distribution diagram of tungsten (VI) species in aqueous solution as a function of pH. [W]total = 0.01 M.

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Fig. 3. Effect of equilibrium pH on the extraction of Mo(VI) and W(VI) by Alamine 308. Condition: [Mo(VI)] = [W(VI)] = 1 g/L, [Alamine 308] = 0.1 M, diluent: kerosene, O/A = 1:1.

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Fig. 4. Effect of equilibrium pH on the extraction of Mo(VI) and W(VI) by TEHA. Condition: [Mo(VI)] = [W(VI)] = 1 g/L, [TEHA] = 0.1 M, diluent: kerosene, O/A = 1:1.

RSOCB3_2019_v28n1_55_f0005.png 이미지

Fig. 5. Effect of equilibrium pH on the extraction of Mo(VI) and W(VI) by TOP. Condition: [Mo(VI)] = [W(VI)] = 1 g/L, [TOP] = 0.1 M, diluent: kerosene, O/A = 1:1.

Table 1. Effect of solution pH on the separation factor between Mo(VI) and W(VI) by several extractants

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