Влияние сульфидных минералов на валентное состояние урана в условиях подземного выщелачивания

Abstract

The effect of sulphide minerals on uranium valence state at in-situ leaching was investigated. It was demonstrated that the reduction of uranium(VI) to uranium(IV) at pH < 4 is possible due to oxidation-reduction processes involving pyrite.The probability of uranium reduction by pyrite decreases with increasing pH of the leach solution.The reduction of uranium (VI) to uranium(IV) by pyrite at pH ≥ 4 is thermodynamically impossible.