Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Solvent Extraction of Li(I) from Weak HCl Solution with the Mixture of Neutral Extractants Containing FeCl3

FeCl3를 함유한 중성추출제의 혼합용매로 약한 염산용액으로부터 리튬(I)의 용매추출

  • Xing, Weidong (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University) ;
  • Lee, Seah (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University) ;
  • Lee, Manseung (Department of Advanced Materials Science & Engineering, Institute of Rare Metal, Mokpo National University)
  • 행위동 (목포대학교 신소재공학과 희유금속연구소) ;
  • 이세아 (목포대학교 신소재공학과 희유금속연구소) ;
  • 이만승 (목포대학교 신소재공학과 희유금속연구소)
  • Received : 2018.11.15
  • Accepted : 2018.12.07
  • Published : 2018.12.28
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Abstract

Solvent extraction of Li(I) from weak HCl solution was investigated by the mixture of TBP/MIBK with other neutral extractants such as Cyanex 923, TOPO and TOP. The TBP/MIBK organic phase was loaded with 0.1 M $FeCl_3$ at different HCl concentrations (1-9 M). Extraction of Li(I) from weak HCl solution is related to the stability of $FeCl_3$ in the organic mixture. As HCl concentration increased in preparing the loaded TBP phase, the stripping percentage of Fe(III) during the extraction of Li(I) became reduced and thus Li(I) could be extracted by ion exchange reaction with hydrogen ion in the organic. The concentration of TBP in the extractant mixture affected the stability of $FeCl_3$. Compared to TBP, Fe(III) was easily stripped from the loaded MIBK and thus no Li(I) was extracted by the mixture with MIBK. The nature of neutral extractant with TBP/MIBK showed little difference in the extraction of Li(I) and stripping of Fe(III).

염산농도가 낮은 용액에서 TBP/MIBK와 다른 중성추출제(Cyanex 923, TOPO, TOP)의 혼합용매에 의한 리튬(I)의 용매추출실험을 수행했다. 0.1 M의 $FeCl_3$가 추출된 TBP/MIBK는 염산농도를 1에서 9 M로 변화시켜 준비하였다. 약한 염산용액에서 리튬(I)의 추출은 유기상에서 $FeCl_3$의 안정도와 관계된다. $FeCl_3$가 추출된 TBP를 진한 염산용액에서 제조하는 경우, 추출시 철의 탈거율이 작아 리튬(I)이 수소이온과의 교환반응에 의해 추출되었다. 혼합용매에서 TBP의 농도도 $FeCl_3$의 안정에 영향을 미쳤다. TBP에 비해 $FeCl_3$는 MIBK로부터 쉽게 탈거되어 리튬(I)을 추출하지 못했다. TBP/MIBK와 혼합용매로 첨가된 중성추출제의 종류는 리튬(I)의 추출과 철의 탈거에 영향을 미치지 않았다.

Keywords

RSOCB3_2018_v27n6_53_f0001.png 이미지

Fig. 1. Effect of HCl on the extraction of Li(I) by single extractant from weak HCl solution. ([HCl] = 0-0.2 M [extractant] = 0.1 M, O/A =1)

RSOCB3_2018_v27n6_53_f0002.png 이미지

Fig. 2. Effect of HCl concentration on extraction of Li(I) by the mixture of Cyanex 923 and TBP containing 0.1 M FeCl3. ([Cyanex 923] = 0.1 M, [HCl]Li(I) solution = 0.05 M)

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Fig. 3. Effect of HCl concentration on extraction of Li(I) by the mixture of TOPO and TBP containing 0.1 M FeCl3. ([TOPO] = 0.1 M, [HCl]Li(I) solution = 0.05 M)

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Fig. 4. Effect of HCl concentration on extraction of Li(I) by the mixture of TOP and TBP containing 0.1 M FeCl3. ([TOP] = 0.1 M, [HCl]Li(I) solution = 0.05 M)

RSOCB3_2018_v27n6_53_f0005.png 이미지

Fig. 5. Effect of HCl concentration on extraction of Li(I) by the mixture of MIBK containing 0.1 M FeCl3. ([Cyanex 923]=[TOPO]=[TOP] = 0.1 M, [HCl]Li(I) solution = 0.05 M)

RSOCB3_2018_v27n6_53_f0006.png 이미지

Fig. 6. Effect of TBP concentration on extraction of Li(I) by the mixture of Cyanex 923 and TBP containing 0.1 M FeCl3. ([Cyanex 923] = 0.1 M, [HCl]FeCl3 solution = 5 M and 7 M, [HCl]Li(I) solution = 0.05 M)

RSOCB3_2018_v27n6_53_f0007.png 이미지

Fig. 7. Effect of TBP concentration on extraction of Li(I) by the mixture of TOPO and TBP containing 0.1 M FeCl3. ([TOPO] = 0.1 M, [HCl]FeCl3 solution = 5 M and 7 M, [HCl]Li(I) solution = 0.05 M)

RSOCB3_2018_v27n6_53_f0008.png 이미지

Fig. 8. Effect of TBP concentration on extraction of Li(I) by the mixture of TOP and TBP containing 0.1 M FeCl3. ([TOP] = 0.1 M, [HCl]FeCl3 solution = 5 M and 7 M, [HCl]Li(I) solution = 0.05 M)

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