• Title/Summary/Keyword: causic soda

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Removal of Arsenic From Closed Mine Tailings by Alkali-Leaching Method (알칼리 용출법에 의한 폐광산 광미중의 비소제거에 관한 연구)

  • 이재령;오종기;이화영;김성규;박재구
    • Journal of Korea Soil Environment Society
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    • v.2 no.2
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    • pp.73-79
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    • 1997
  • Removal of the Arsenic components from the closed mine tailings has been attempted by the alkali-leaching method. Two tailings collected from the Daduck and Yuchon mine which were already closed many years ago were leached with caustic soda solutions. The Arsenic components in the leach liquor resulted from the alkali treatment of tailings could be removed fairly well in the form of insoluble calcium-Arsenic compound by the precipitation with calcium chloride. As a result, the extraction of about 60~90% Arsenic from the tailings could be obtained depending on the leaching conditions and the influence of temperature and the slurry density on the extraction of Arsenic was also found to be very small at the NaOH concentration more than 0.5N. In addition, it seemed that a caustic soda solution over 0.5N NaOH could be used repeatedly for the leaching of tailings since the consumption of NaOH was not so great in a leaching of them. As far as the precipitation of Arsenic components was concerned, more than 99% of Arsenic could be precipitated within 10 minutes by the addition of 2wt% CaC12 in to the leach liquor.

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