黃酸에 의한 輝水鉛石의 焙燒精鑛으로부터 銅의 除去
Removal of Copper from Roasted Molybdenite Concentrate by Sulfuric Acid
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초록
휘수연석의 배소정광으로부터 제강용 산화몰리브덴(MoO3) 분말을 제조하기 위해서는 동을 제거하는 것이 매우 중요하다. 본 연구에서는 황산침출에 의하여 휘수연석의 배소정광으로부터 동을 침출, 제거하는 연구를 수행하였다. 실험 결과 휘수연석의 배소정광으로부터 동을 효과적으로 침출, 제거하기 위한 최적침출조건은 황산농도 1.5 vol.%, 침출온도 25℃, 고액비 1,000 g/L, 침출시간 30분인 것으로 나타났다. 또한 침출반응 종료 후 30분 이상 정치함으로서 몰리브덴의 회수율이 향상되는 것으로 나타났다. 최적조건에서 침출잔사로 회수된 산화몰리브덴의 분말은 80% 이상 MoO3, 0.5% 미만 Cu를 함유함으로서 제강용 합금원소로 사용이 가능한 것으로 분석되었다. 최적조건에서 침출잔사로 회수된 Mo의 회수율은 98～99%이였으며, 침출액에 존재하는 동은 철을 환원제로 사용하는 시멘테이션 방법으로 회수할 수 있었다.
Abstract
It is very important to remove copper from roasted molybdenite concentrate for making molybdenum oxide which is required for the production of alloyed steel. In the paper, a study for removing copper from roasted molybdenite concentrate by sulfuric acid leaching was carried out. From the experiments, it was found that the optimum condition for removing copper is the sulfuric acid of 1.5 vol.%, the leaching temperature of 25℃, the S/L ratio of 1,000 g/L, and the leaching time of 30 minutes. It was also verified that the recovery efficiency of molybdenum was improved by holding the leach liquor up to 30 minutes after leaching. The leach residue obtained at the optimum condition contains over 80% MoO3 and below 0.5% Cu, which could be used for the production of alloyed steel. At the optimum condition, the recovery ratio of molybdenum was 98～99%. Also, copper could be recovered from the leach liquor by cementation method using iron sheets as a reducing agent.
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