資源と素材
Online ISSN : 1880-6244
Print ISSN : 0916-1740
論文
酸化マグネシウムによる坑廃水中和処理殿物のフェライト化に関する研究
吉田 哲也五十嵐 敏文朝倉 國臣宮前 博子彌富 信義橋本 晃一
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2004 年 120 巻 10,11 号 p. 577-583

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To reduce the volume of precipitates generated by the neutralization of acid mine drainage (AMD) containing high concentrations of Fe and As, ferritization of the precipitates was attempted by a two-step neutralization process in which magnesium oxide (MgO) was used as the first neutralizer and sodium hydroxide (NaOH) as the second. Batch neutralization experiments with MgO and continuous flow experiments by the two-step neutralization were conducted in laboratories and an AMD treatment plant. The results showed that the precipitates by the neutralization were magnetized in the continuous flow experiments, although there was Al and Si that prevented the generation of ferrite in the AMD. This indicates that ferrite was formed from the precipitates after removing most of the soluble Al and Si by the first neutralization. In addition, aging of the precipitates under reducing conditions and returning the aged precipitates to a ferrite tank were required to form ferrite. The molar ratio of As to Fe in the precipitates reached a constant value at pH>3.5. This suggests the coprecipitation of As and Fe.

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© 2004 by The Mining and Materials Processing Institute of Japan
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