人形峠ウラン鉱石のバット・リーチングに関する基礎研究
1981 年 97 巻 1116 号 p. 101-105
詳細
1981 年 97 巻 1116 号 p. 101-105
Laboratory tests of vat leaching of easy-to-solve uranium ore were made to obtaina general understanding of the characteristics of leaching and washing of uranium ore. The neutralization of waste water and of leached residues were also studied. The ore utilized in this work was low grade and coarse uranium ore from Yotsugi deposit of Ningyo-Toge mine.
It was found that a high recovery of uranium, say 88% plus, is readily achieved by leaching coarse and low grade ore (-150mm and 0.07%U) in a vat with sulphuric acid solutions. The period required for leaching and washing was around two weeks in total. Flow rates of leach solution were determined as a function of the height of ore bed in the vat. Flow rate of leach solution was sensitively affected by the height of ore bed.
The usage of caustic soda for the surface treatment of leached residue was found to be more preferable than that of lime, resulting the efficient depression of the dissolution of uranium.
