The high-carbon ferromanganese furnace is a semi-continuous unit proce
ss, with a number of complex, and partly unknown mechanisms taking pla
ce inside it. The furnace operation has been characterized by fluctuat
ions in vital process variables. Many of the operational problems are
caused by the lack of information about the internal conditions. This
paper presents an object-oriented model of the furnace and its future
application in monitoring the furnace conditions. The object-orientati
on ensures that the model becomes easy to modify as new process knowle
dge is collected.