Geochemistry of manganese (II) precipitation in mine drainage treatment

Abstract

Oxidative dissolution of sulfide minerals by the atmosphere generates toxic metal-containing drainage in Active and abandoned mines. Ferrous and manganese ions in the drainage can be precipitated through an oxidation reaction; however, the actual technique of manganese removal is not contracted yet because its reaction is significantly complex rather than ferrous ion. This presentation shows the kinetic effects of autocatalytic reaction by MnO₂ and complex ion formation by anions on the manganese oxidation rate, based on results obtained by experiments using actual drainages in Japanese mines.