Fundamental Study on the Separation of Iron Hydroxide and Gypsum Precipitated in the Neutralization Process of Acid Mine Drainage by Flotation Method

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  • 中和殿物中の水酸化鉄と石膏の浮選分離に関する基礎的研究
  • チュウ ワドノブツチュウ ノ スイサンカ テツ ト セッコウ ノ フセン ブン

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Abstract

In the neutralization process of iron bearing acid mine drainage, iron hydroxide and gypsum are precipitated and dumped into a dam. It is important to separate these precipitates in order to utilize them as iron and gypsum resources.<BR>First, the floatability of ferric hydroxide, which was precipitated by the reaction of ferric chloride with sodium hydroxide and washed with pure water, and that of natural gypsum were examined at various pH using dodecyl ammonium acetate (DAA), sodium dodecyl sulfate (SDS) and sodium oleate (NaOl) as a collector. Using DAA, ferric hydroxide floated only in alkaline medium, whereas gypsum floated over the range of pH 3-11. On the other hand, when SDS or NaOl was used, gypsum floated in wide pH range. In this case, however, the floatability was lower than in the case of DAA. From the above results, it was expected that gypsum would be separated from ferric hydroxide by using DAA in acidic medium.<BR>Then, flotation tests were carried out on the mixture of gypsum and ferric hydroxide using DAA as a collector. As a result, the flatability of ferric hydroxide was very low even in alkaline medium and a good separation was achieved in wide pH range. This phenomenon may be related to the fact that ferric hydroxide was depressed in the saturated solution of gypsum.<BR>Also, when artificial gypsum was used instead of natural gypsum, similar results were obtained.

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