폐탄광 광산배수에서 Fe, Al 회수를 위한 선택적 연속침전 처리효율 향상연구
Treatment of Selective Sequential Precipitation for Recovering Fe and Al From Mine Water an Abandoned Coal Mine
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초록
채굴이 중단된 폐광산으로부터 배출되는 광산배수는 많은 오염을 일으키는 원인이 되고 있다. 과거에서부터 지금까지 광산배수를 처리하기 위한 석회의 사용으로 인해 침전물인 다량의 슬러지 폐기물을 발생시키고 있다. 따라서 본 연구는 광산배수로부터 발생하는 많은 양의 슬러지 폐기물을 감소시키고, 각 금속들을 회수하여 처리하는 것을 목표로 선정하였다. 산성광산배수 내의 용존 금속 중 Fe, Al을 대상으로 고순도 침전물로 침전시키기 위해 buffer 공정을 추가한 SSP(selective sequential precipitation)시스템을 설치하였다. 침전물의 회수율과 순도는 현장에서 측정 및 화학분석을 통해 평가하였다. SSP 공정을 이용하여 Fe, Al의 회수율과 순도를 평가하였다. Fe 회수율은 99.68~99.70 이며, Al 회수율은 75.00~81.82%로 나타났다. Fe 순도는 96.05~97.61%이며, Al 순도는 81.01~87.48%로 나타났다. Fe와 Al의 고순도 침전물로 회수가 가능할 수 있었다.
Abstract
Mine drainage discharged from abandoned mines are causing a lot of pollution. Conventional lime dosing process is generates a lot of waste due to the generation of the sludge in the process. Therefore, this study aims to assess the feasibility of both treating the mine drainage while recovering individual metals and decreasing the amount of waste by decreasing the amount of sludge. In order to selectively recovery Fe and Al in the coal mine drainage as high-purity precipitation, we installed a SSP(selective sequential precipitation) system with a buffer tank. The recovery rate and purity of the precipitates were evaluated from field measurement and chemical analysis. We also evaluated the recovery rate and the purity of Fe and Al. The recovery rate of Fe and Al are 99.68~99.70 and 75.00~81.82%, respectively. The purity of Fe and Al was determined to be 96.05~97.61% and 81.01~97.48%, respectively.
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