강산성용액에서 Cyanex 301에 의한 Co 및 Ni 회수 연구
Recovery of Co and Ni from Strong Acidic Solution by Cyanex 301
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초록
코발트와 니켈을 함유한 공정부산물 및 폐자원으로부터 Cyanex 301을 사용하여 코발트 및 니켈을 분리, 회수하는 실험을 실시하였다. 황산침출 모의 용액으로부터 10 v/v% Cyanex 301을 사용하여 추출할 경우, 리튬은 추출되지 않았으며, 평형 pH 1.5, 추출 상비(A/O) 1.0조건에서 마그네슘은 0.44%, 망간은 11.57% 추출되었으며 코발트와 니켈은 99% 이상 추출되었다. McCabe-Thiele diagram 분석 결과, 추출 상비(A/O) 2.0, 2단 추출을 통해 코발트와 니켈을 99.9% 이상 동시 추출 가능성을 확인하였다. 공추출 된 마그네슘 및 망간의 경우 세정 공정을 통해 제거가 가능하였는데, 세정액으로 0.05M 황산용액에서는 마그네슘은 99%, 망간은 87%이상 제거되었고, 세정액으로 0.05M 염산용액을 사용할 경우에는 마그네슘은 99.9%, 망간은 80% 이상 세정되어 제거 가능하였다. 세정 후 추출액에서 탈거 시에는탈거액으로 3.0M 황산을 사용할 경우에는 코발트는 93%, 니켈은 5% 정도 탈거가 되어 선택적 탈거가 가능하였다. 그러나 8M HCl을 사용할 경우에는 코발트는 99.9% 이상, 니켈도 90% 이상 탈거되어 코발트와 니켈을 동시에 회수가 가능하였다.
Abstract
An experiment was conducted to separate or recover Co and Ni using Cyanex 301 from process by-products and waste resources containing Co and Ni. To separate and recover Co and Ni from simulated leaching solutions, 10 v/v% Cyanex 301 was used as an extractant in this study; Li was not extracted. At equilibrium pH 1.5 and a phase ratio (A/O) of 1.0, 0.44% of Mg and 11.57% of Mn were extracted, and more than 99% of Co and Ni were extracted. McCabe-Thiele diagram analysis confirmed that more than 99.9% of Co and Ni could be extracted simultaneously through two-stage extraction with an extraction phase ratio (A/O) of 2. It was possible to extract Mg and Mn simultaneously through the scrubbing process. In the scrubbing process, more than 99% of Mg and 87% of Mn were scrubbed using 0.05 M of H2SO4, and 99.9% of Mg and more than 80% of Mn were scrubbed using 0.05 M of HCl. In the stripping process, 93% of Co and 5% of Ni were stripped selectively by 3.0 M of H2SO4. However, when 8.0 M of HCl was used as a stripping solution, more than 99.9% of Co and more than 90% of Ni were stripped simultaneously.
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