• 자원리싸이클링
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• 제20권5호
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• pp.46-51
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• 2011

PC88A, D2EHPA, Cyanex272, Versatic acid10, D2EHPA+Alamine-304-1, D2EHPA+Alamine-308, D2EHPA+TBP, D2EHPA+TOPO, PC88A+Alamine-336, PC88A+TBP와 같은 단독 및 혼합추출제를 사용하여 Nd의 용매추출실험을 수행했다. 수용액의 평형 pH와 추출제의 농도가 증가함에 따라 Nd의 추출율은 증가하였다. 그러나 D2EHPA와 TBP 혼합추출제로 추출시에는 추출제의 농도증가에 따라 Nd의 추출율이 감소하였다. PC88A에 TBP를 첨가하는 것은 Nd의 추출에 거의 영향을 미치지 않았으나, Alamine336을 첨가하면 동일한 조건에서 추출율이 증가하였다. 실험결과로부터 단독 및 혼합추출제에 의한 Nd의 추출에 대해 고찰하였다.

• Bulletin of the Korean Chemical Society
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• 제35권7호
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• pp.2109-2113
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• 2014

Solvent extraction of Fe(III) from chloride solution by using a mixture of D2EHPA (Di-(2-ethylhexyl)-phosphoric acid) and TBP (Tri-butyl phosphate) and the reductive stripping of Fe(III) from the loaded organic were investigated. Quantitative extraction of Fe(III) from the solution (Fe concentration = 90 g/L) was accomplished in two cross-current extraction stages by using the mixture of D2EHPA and TBP. In order to facilitate the stripping efficiency, a reductive stripping method was employed by using $H_2SO_3$ or $Na_2SO_3$ as a reducing agent. The addition of $H_2SO_4$ into reducing agents led to improvement in the stripping efficiency while high concentration acid would suppress it. Both of the mixtures of $H_2SO_4+H_2SO_3$ and $H_2SO_4+Na_2SO_3$ showed good efficiency for the stripping of Fe(III), while the latter was recommended as the stripping solution based on the economics and experimental condition.