Effects of Co-existing Ions on the Ferrite Formation at Ambient Temperature in the Treatment of Acid Mine Drainage Containing Iron-An Application of Ferrite Formation at Ambient Temperature to the Treatment of Acid Mine Drainage Containing Iron (Part 2)-

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Other Title
  • 含鉄酸性坑廃水における常温下でのフェライト生成に対する共存イオンの影響―含鉄坑廃水処理における常温フェライト法の適用（第２報）―
  • 含鉄酸性坑廃水における常温下でのフェライト生成に対する共存イオンの影響--含鉄抗廃水処理における常温フェライト法の適用(第2報)
  • ガンテツ サンセイ コウハイスイ ニ オケル ジョウオンカ デノ フェライト セイセイ ニ タイスル キョウゾン イオン ノ エイキョウ ガンテツ コウハイスイ ショリ ニ オケル ジョウオン フェライトホウ ノ テキヨウ ダイ 2ホウ
  • An Application of Ferrite Formation at Ambient Temperature to the Treatment of Acid Mine Drainage Containing Iron (Part 2)
  • 含鉄坑廃水処理における常温フェライト法の適用(第2報)

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Abstract

The feasibility of making ferrite at ambient temperature from aqueous solutions of simulated acid mine drainage was investigated following our previous report. In this paper, qualitative and quantitative effects of coexisting ions such as Mn(II), Zn(II), Al(III) and Si(IV), on ferrite formation were investigated.<BR>As the first step, influences of several coexisting ions on the settling volume of the precipitates were investigated. In the case of Mn(II) or Zn(II) coexisting system, which are well known to have the capacity to substitute to the part of the lattice of ferrite, the settling volume increased a little, but in the case of Al(III) or Si(IV) coexisting system, which are known to impede ferrite formation, the settling volume considerably increased. However, the interference of Al(III) or Si(IV) to ferrite formation was weakened in the sludge recycling system.<BR>Secondly, their influences on the yield of magnetite or ferrite, which are calculated by the total oxygen consumption in the aerial oxidation reaction test, were investigated. The yield of magnetite decreases with an increase of Al(III) or Si(IV), but their interferences on ferrite formation were weakened in the presence of restored magnetite seed.<BR>Thirdly, their influences on the reaction rate in the aging process were also examined by solid-solid reaction test in which Fe(OH)2, FeOOH and coexisting ions reacted directly in reduction atmosphere and at a fixed pH. The reaction coefficient considerably decreased not only by Al(III) or Si(IV), but also by Mn(II) or Zn(II), which are estimated not to impede ferrite formation.

Journal

  • Journal of MMIJ

    Journal of MMIJ 123 (3), 103-109, 2007

    The Mining and Materials Processing Institute of Japan

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