Multiphase slags form the basis of the reduction pathway for manganese ferroalloy production. The
present work aims to understand the flow of slag through the coke bed based on experimentation in
controlled conditions. Synthetic slags of different basicities were evaluated for their phase
composition, viscosity, and flow. The two-phase slag will have two zones: a liquid slag zone and a
multiphase zone. The multiphase zone will consist mostly of a solid phase with some liquid slag
between the solid particles. The multiphase part will hence have a high viscosity. The liquid zone will
flow into the coke bed while the multiphase area will stay. With increasing reduction, the multiphase
area will decrease in size until the solid phase is gone and the whole slag will flow into the coke bed.
The effective viscosity of slag will decrease with the lowering of the solid oxide phase. The results
from flow experiments confirmed that the segregation of phases occurs when slag flows through the
coke bed. It is observed that the flow is dependent both on the size of the void and the viscosity of
slag.