자철석을 이용한 침출모사액 중 금이온의 흡착 거동
The Adsorption Behaviors of Gold Ions in Simulated Leachate Using Magnetite
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초록
본 연구에서는 자철석을 흡착재로 이용, 금침출모사액으로부터 금이온을 선택적으로 분리하는 연구실험을진행하였다. 그 결과, 액중 pH 중성영역대에서 교반속도, 온도, 자철석투입량이 증가할수록 금이온의 흡착효율이 증가하였다. 금이온 농도 100 mg/L 및 염화나트륨 농도 0.1 mol/L, 자철석 투입량 3.6 %, pH 6-8, 교반속도 150 rpm, 반응온도 90°C 조건에서 실험을 수행한 결과 6시간 이내에 금이 100% 흡착되었다. 또한, 금이온이 구리, 니켈 같은 불순물과 함께 존재할 경우 금이온 흡착제거율이 96%인 반면, 구리나 니켈이온은 거의 흡착되지 않아 자철석으로 금의 선택적인 분리가 가능함을 확인하였다. 자철석은 흡착 후 자력 분리가 가능하여 기존 흡착공정내 고액분리공정시 자주 발생하는 체막힘 문제를 피할 수 있어 공정 효율 향상이 기대된다.
Abstract
In the present study, the separation of gold ions from simulated gold leaching solution was performed by selective adsorption of gold ions onto the magnetite. The adsorption efficiency of gold ions increased in neutral pH with increasing agitation speed, temperature, and amount of magnetite added. All of the gold ions were completely adsorbed within 6 h under the following conditions: gold ion concentration 100 mg/L, NaCl concentration 0.1 mol/L, magnetite addition 3.6%, pH 6-8, agitation speed 150 rpm, and temperature 90°C. When gold ions exist with copper and nickel ions, 96% of gold ions are adsorbed onto magnetite particles while the low adsorption of copper and nickel ions was observed, which indicates that selective adsorption of gold ions could be achieved. The efficiency of the separation process would be enhanced by avoiding clogging of screen because the magnetite particles with gold ions on them could be separated by magnetic separation processes.
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