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최준현 ( Junhuyn Choi ),김완태 ( Wantae Kim ),김상배 ( Sangbae Kim ),배인국 ( Inkook Bae ),서주범 ( Joobeom Seo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2020 No.-
Arsenic is one of the most dangerous inorganic pollutants, causing serious health and environmental emergencies in many areas of the world. For this reason, all over the world, arsenic concentration in soil is being rigorously regulated. In this study, a flotation process is proposed for separating the arsenicbearing minerals to recycle the soil surrounding the Janahang refinery in South Korea, which contains a high level of arsenic. To maximize the arsenic removal, several experimental parameters were systematically investigated. X-ray diffraction revealed that the contaminated soil was mainly composed of arsenopyrite (FeAsS), arsenic trioxide (As<sub>4</sub>O<sub>6</sub>), arsenic pentoxide (As<sub>2</sub>O<sub>5</sub>), and quartz (SiO<sub>2</sub>). Flotation experiments with various concentrations of potassium amyl xanthate (PAX) showed that arsenic removal increased with increasing PAX concentration. The additions of activators (Na<sub>2</sub>S, CuSO<sub>4</sub>, Na<sub>2</sub>S+CuSO<sub>4</sub>) in pulp pH greatly increased the arsenic removal. In addition, oil agglomerate flotation was conducted to enhance the arsenic removal by improving the separation of fine particles. The results showed that arsenic removal increased with increasing non-polar oil concentration. Based on the results obtained from the optimization tests, a flotation process by which the arsenic-contaminated soils can be recycled was successfully designed.
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