Kinetic analysis of manganese removal from mine water- continuous flow reaction system

Abstract

Manganese removal from mine water by oxidation-precipitation often requires significant contact time and the use of a high pH-value for reaction stage. In order to avoid reactor over sizing or under sizing, kinetic data for manganese oxidation using mine water or very similar aqueous systems are needed. As the batch type tests can be difficult to control (e.g. to set a certain pH value during the start-up), the continuous flow reaction systems seem to be more reliable as the direct determination of reaction rate is possible in this case. Results obtained using manganese sulphate solution and real mine water are presented here. A third order reaction rate law was obtained, taking into account homogenous and heterogeneous mechanism.