REACTIONS BETWEEN MULTICOMPONENT SLAGS AND MN-FE-SI-C ALLOYS - EQUILIBRIUM AND STOICHIOMETRY

Background/aims: The purpose was to establish equilibrium and stoichio metric relations associated with production of manganese ferroalloys, and to determine experimentally equilibrium distribution between multi component slags and Mn-Fe-Si-C-sat alloys. Methods: Measurements were carried out in a resistance furnace in an argon and carbon monoxide at mosphere in the temperature range 1350 degrees C to 1500 degrees C. Gr aphite crucibles were used. Only a small amount of slag was charged to expose both metal and slag to the gas phase. In this way, complete eq uilibrium was established relatively fast. Metal samples were analyzed by wet chemical methods and slag samples by electron microprobe analy sis. Results and conclusions: A thermodynamic analysis has been made a nd a graphical method is developed for simultaneous description of equ ilibrium and stoichiometric relations in slag diagrams. The results of equilibrium measurements are compared with previous results, and the effect of adding MgO to the slag and Fe to the metal is especially dis cussed.