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The solvent extraction of palladium from aqueous chloride media was carried out using di-n-hexyl sulfide(DHS) known as a selective extractant for palladium. The effects of the concentrations of extractant, palladium, Cl-, NO3-, and HCl on the palladium extraction were investigated. Also, The effects of NH4OH concentration, contact time, and the addition of NH4Cl were examined in the stripping of palladium from the organic phase with NH4OH solution. The result shows that palladium was extracted as PdCl2·2DHS. The initial rates of palladium extraction decreased with the increase of HCl and NO3- concentrations in the aqueous phase. The extraction of palladium with DHS was endothermic with DHo of -65.6 kJ/mol which the distribution coefficient increased with temperature. Palladium in the organic phase was completely stripped with NH4OH solution.
추출제로 di-n-hexyl sulfide(DHS)를 사용하여 염산산성용액에서 팔라듐의 용매추출에 대한 실험을 행하였으며 추출제, 팔라듐, Cl-, NO3-, 그리고 HCl의 농도가 팔라듐의 추출에 미치는 영향을 조사하였다. 또한 NH4OH 용액에 의한 유기상으로부터 팔라듐의 역추출 실험에서 NH4OH 농도, 접촉시간 및 NH4Cl 첨가의 영향을 조사하였다. 팔라듐은 유기상에 PdCl2·2DHS로 추출되었으며 수상의 HCl과 NO3- 농도가 증가함에 따라 추출속도가 감소하였다. 팔라듐의 추출반응은 온도가 증가함에 따라 분배계수가 증가하는 흡열반응이며 DHo의 값은 -65.6 kJ/mol 이었다. 유기상으로 추출된 팔라듐은 5 M NH4OH 용액을 사용하여 유기상으로부터 완전히 역추출 되었다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean institute of mineral and energy resources engineers
- Journal Title(Ko) :한국자원공학회지
- Volume : 37
- No :3
- Pages :166-172
Journal of the Korean Society of Mineral and Energy Resources Engineers
