Arsenic removal from contaminated soils for recycling via oil agglomerate flotation
| Autor: | Seungwoo Lee, Junhyun Choi, Yosep Han, Hyunjung Kim, Eunseong Lee, Siyoung Q. Choi |
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| Rok vydání: | 2016 |
| Předmět: |
inorganic chemicals
General Chemical Engineering Potassium chemistry.chemical_element Arsenic pentoxide 02 engineering and technology 010501 environmental sciences 01 natural sciences Industrial and Manufacturing Engineering 020501 mining & metallurgy chemistry.chemical_compound Environmental Chemistry Arsenic trioxide Arsenic 0105 earth and related environmental sciences Arsenopyrite integumentary system Waste management General Chemistry Soil contamination 0205 materials engineering chemistry visual_art Environmental chemistry Soil water visual_art.visual_art_medium Xanthate |
| Zdroj: | Chemical Engineering Journal. 285:207-217 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2015.09.105 |
| Popis: | In this study, a flotation process is proposed for separating the arsenic-bearing minerals to recycle the soil surrounding the Janghang refinery in South Korea, which contains a high level of arsenic. To maximize the arsenic recovery, several experimental parameters were systematically investigated. X-ray diffraction revealed that the contaminated soil was mainly composed of arsenopyrite (FeAsS), arsenic trioxide (As 4 O 6 ), arsenic pentoxide (As 2 O 5 ), and quartz (SiO 2 ). Flotation experiments with various concentrations of potassium amyl xanthate (PAX) showed that arsenic recovery increased with increasing PAX concentration. The addition of activators (Na 2 S, CuSO 4 , Na 2 S + CuSO 4 ) in pulp pH greatly increased the arsenic recovery. In addition, oil agglomerate flotation was conducted to enhance the arsenic recovery by improving the separation of fine particles. The results showed that arsenic recovery increased with increasing nonpolar 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. |
| Databáze: | OpenAIRE |
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