Applicability of Magnesium Oxide as a Neutralizing Agent in Mine Water Disposal.

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  • BEKIN Ali
    Graduate Student, Tohoku University
  • MATSUOKA Isao
    Graduate School of Engineering, Tohoku University, Aoba–ku, Sendai 980–8579

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Other Title
  • 坑廃水処理における中和剤としてのＭｇＯの適用性について
  • コウハイスイ ショリ ニ オケル チュウワザイ トシテノ MgO ノ テキヨウ

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Abstract

Applicability of magnesium oxide as a neutralizing agent in mine water disposal has been investigated using an artificial mine water containing ferrous iron of 1,000 mg dm-3 in terms of the reagent dosage and the reaction time. Ferrous ions were more effectively oxidized to ferric ions by aeration of the solution in the presence of magnesium oxide than by that in the presence of limestone. Aeration of the solution decreased the magnesium oxide dosage and the reaction time required for lowering the iron concentration to the acceptable value. Furthermore, recycling of the sludge showed the effects of reduction of the reagent dosage, shortening of the reaction time and densification of the sludge. Sludge recycle processes without and with aeration formed a sludge with the solid concentration of 0.155 and 0.373 g cm-3 by the addition of magnesium oxide of 1.25 and 1.5 equivalents for ferrous iron and sulfuric acid in the solution, respectively. In both processes, the reaction times were 30 minutes.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 114 (8), 553-559, 1998

    The Mining and Materials Processing Institute of Japan

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