Ferromanganese
WEBManganese Ferroalloys Technology. Merete Tangstad, in Handbook of Ferroalloys, 2013. PostTap Hole Processing for FeMn and SiMn. Both ferromanganese and silicomanganese furnaces are tapped every 2 to 3 hours. Even for duplex practice, there is a substantial amount of slag (Tables and ), so especially in the case of larger .