Ferromanganese - an overview | ScienceDirect Topics
In mining operations, manganese concentrations of 250 mg/m 3 or even higher have sometimes been found (Ansola et al., 1944, Rodier, 1955). High-speed drilling machines used to be the main cause of a large amount of manganese dioxide dust emitted in the working environment. In dry cell battery plants and ferromanganese plants, the concentrations ...
