Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Solvent Extraction of Tb(III) from Chloride Solution using Organophosphorous Extractant, its Mixture and Ionic Liquids with Amines

염산용액에서 유기인산과 아민추출제의 혼합용매와 이온성액체에 의한 Tb(III)의 용매추출

  • Oh, Chang Geun (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 : 2018.11.15
  • Accepted : 2018.12.26
  • Published : 2019.02.28
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Abstract

The solvent extraction of Tb(III) from hydrochloric acid solution was investigated by employing single organophosphorus (D2EHPA, PC88A and Cyanex 272), its mixture with Alamine 336 and ionic liquids with Aliquat 336. The equilibrium pH after the extraction with extractant mixtures and ionic liquids was higher than that by single extractants. Among the mixtures and ionic liquids, only the ionic liquid with Cyanex 272 and Aliquat 336 showed synergism to the extraction of Tb(III). The extraction percentage of Tb(III) by the extractant mixtures was lower than that by single extractant and the extraction order was in the following order : D2EHPA + Alamine 336 > PC88A + Alamine 336 > Cyanex 272 + Alamine 336. The extraction order of Tb(III) by the ionic liquids was Cyanex 272 + Aliqaut 336 > PC88A + Aliquat 336 > D2EHPA + Aliquat 336.

염산용액에서 유기인산 추출제(D2EHPA, PC88A, Cyanex 272) 단독, Alamine 336과의 혼합용매, Aliquat 336으로 제조한 이온성액체에 의한 터븀(III)의 용매추출을 조사하였다. 유기인산의 혼합용매와 이온성액체를 사용하면 단독 유기인산에 비해 수용액상의 평형 pH는 상승하였다. 세 종류의 유기인산 추출제중에서 Cyanex 272와 Aliquat 336과의 이온성액체에서만 터븀(III) 추출에 대해 상승효과가 있었다. 혼합용매에 의한 터븀(III)의 추출률은 단독조건보다 낮았으며 D2EHPA + Alamine 336 > PC88A + Alamine 336 > Cyanex 272 + Alamine 336의 순서로 추출률이 높았다. 이온성액체로 추출시 Cyanex 272 + Aliqaut 336 > PC88A + Aliquat 336 > D2EHPA + Aliquat 336 순서로 터븀(III)의 추출률이 높았다.

Keywords

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Fig. 1. Variation of the extraction percentage of Tb(III) from chloride solution by organophosphorous extractants (Initial pH = 3, [Tb(III)] = 100 mg/L).

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Fig. 2. Effect of equilibrium pH on extraction of Tb(III) from HCl solution by extractant mixtures ([Tb(III)] = 100 mg/L).

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Fig. 3. Effect of equilibrium pH on extraction of Tb(III) with ionic liquids ([Ionic liquid] = 0.003 M, [Tb(III)] = 100 mg/L).

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Fig. 4. Effect of the concentration of the extractant mixtures on the extraction of Tb(III) (Initial pH = 3, [Tb(III)] = 100 mg/L).

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Fig. 5. Extraction of Tb(III) with single Cyanex 272, mixture with Alamine 336, and ionic liquid with Aliquat 336 (Initial pH = 3 [Alamine 336] = 0.01 M, [Tb(III)] = 100 mg/L).

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Fig. 6. Extraction of Tb(III) with single PC88A, mixture with Alamine 336, and ionic liquid with Aliquat 336 (Initial pH = 3, [Alamine 336] = 0.01 M, [Tb(III)] = 100 mg/L).

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Fig. 7. Extraction of Tb(III) with single D2EHPA, mixture with Alamine 336, and ionic liquid with Aliquat 336 (Initial pH = 3, [Alamine 336] = 0.01 M, [Tb(III)] = 100 mg/L).

Table 1. Variation in the synergistic coefficient of Tb(III) in the extraction by ionic liquids of with Aliquat 336 (Initial pH = 3)

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Table 2. Variation in the equilibrium pH by single organophosphorous and its mixture with Alamine 336 (Initial pH = 3, [Alamine 336] = 0.01 M)

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Table 3. Variation in the equilibrium pH by single organophosphorous and its ionic liquid with Aliquat 336 (Initial pH = 3)

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