論文

査読有り
2012年

Scorodite solubility and storage management systems for arsenic-bearing compounds

TMS Annual Meeting
  • Tetsuo Fujita
  • ,
  • Shun Fujieda
  • ,
  • Kozo Shinoda
  • ,
  • Shigeru Suzuki

開始ページ
407
終了ページ
417
記述言語
掲載種別
研究論文(国際会議プロシーディングス)

Dowa's scorodite, synthesized by oxidation of Fe(II) ions in the presence of As(V) ions at atmospheric pressure, was characterized. The scorodite was well crystallized and had a very low solubility. To examine the conditions for stable storage of the scorodite for long periods, experiments with various synthesis and leaching conditions were done. The scorodite had a very low arsenic solubility in sea water. It was estimated in consecutive leaching tests that the arsenic concentration would eventually converge to zero. The prevention of arsenic leaching by adding goethite or ferrihydrite was limited in some cases. Very low toxicity was confirmed by toxicity tests. The investigation results suggest that disposal at a specifically designed well-controlled storage place is preferable for the scorodite whose toxicity had been made sufficiently low. Disposal to an isolated final disposal site with more stringent prevention for the outflow of toxic substances was thought another option.

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