Dearsenification of Hot Metal with CaC₂-CaF₂ Slag

Dearsenification of hot metal was studied on the bench scale with CaC₂-CaF₂ slag. Experiments were carried out in the Molybdenum-wound furnace under Ar atmosphere in the graphite crucible. Effects of temperature, composition and amount of slag, the initial As content and the Si content of hot metal on the degree of dearsenification were investigated.
Thermodynamic analysis has shown that dearsenification in iron and steel melts is only accomplished under reducing conditions. It has been ascertained that it is impossible to carry out desulfurization, dephosphorization and dearsenifieation of hot metal with CaC₂-CaF₂ or CaO-CaF₂ slag simultaneously.