황산코발트溶液으로부터 超臨界CO_2에 의한 코발트 抽出擧動
Behavior of Cobalt Extraction from Cobalt Sulphate solution using Supercritical CO_2
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초록
초임계 CO_2추출은 기존의 금속추출/용매추출 공정을 대체할 수 있는 새로운 공정으로써의 큰 가능성을 가지고 있는 기술이다. 초임계 CO_2를 이용하여 황산코발트용액으로부터 코발트의 추출에 대한 연구를 수행하였다. 코발트의 추출을 위해 bis (2,4,4-trimethylpentyl) phosphinic acid 및 diethylamine을 초임계 CO_2와 함께 추출제로 사용하였으며 Co^(2+)의 추출거동을 관찰하였다. 초임계 CO_2추출은 60℃, 200 bar의 조건에서 실시하였고 실험은 초임계 CO_2/추출제 착염화과정과 금속추출과정으로 구성된 공정을 이용하여 진행하였다. 실험결과 코발트의 추출률은 추출제 투입량에 따라 16-99%까지 증가하였다.
Abstract
Supercritical CO_2(scCO_2) extraction has a great possibility to be a new process to recover metal and to replace the existing leaching/solvent extraction processes. The cobalt extraction was carried out using scCO_2 from cobalt sulphate solution. The bis (2,4,4-trimethylpentyl) phosphinic acid and diethylamine ligands were used to extract cobalt ion in scCO_2. The recommended method consists of scCO_2/extractants complexation process and metal extraction process at 60, 200bar. Experimental results showed that the extraction efficiency of Co was increased by 16-99% with increasing the ligand amount.
참고문헌 (8)
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