資源と素材
Online ISSN : 1880-6244
Print ISSN : 0916-1740
ISSN-L : 0916-1740
Original Paper
炭酸カル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
丸山 悠五十嵐 敏文朝倉 國臣宮前 博子彌富 信義橋本 晃一
著者情報
ジャーナル フリー

2005 年 121 巻 10,11 号 p. 521-531

詳細
抄録

To reduce the volume of precipitates generated by the neutralization of acid mine drainage (AMD) containing high concentrations of Fe and As, the formation of ferrite using the precipitates was attempted by a two-step neutralization process in which calcium carbonate (CaCO3) was used as the first neutralizer and sodium hydroxide (NaOH) as the second. Batch neutralization experiments with CaCO3 and continuous flow experiments by the two-step neutralization were conducted in the laboratory and in an AMD treatment plant. The results showed that the precipitation of Fe, Al, Si, and As was primarily determined by pH and not by the kind of neutralizer. The precipitates in the ferrite sedimentation tank were magnetized in the continuous flow experiments, although the Al and Si prevented the generation of ferrite in the AMD and the precipitates contained calcite and gypsum as impurities. The molar ratio of As to Fe in the precipitates in the CaCO3 sedimentation tank was estimated at approximately 0.01 at 2<pH<5. This suggests the coprecipitation of As and Fe. The mass balance calculation based on the results of the AMD treatment adopted here suggests that the amount of precipitates produced by ferrite formation is reduced by 15% for CaCO3 and 67% for MgO compared with a conventional treatment.

著者関連情報
© 2005 by The Mining and Materials Processing Institute of Japan
前の記事 次の記事
feedback
Top