STUDY OF SMELTING PARAMETERS IN THE PRODUCTION OF SILICOMANGANESE FROM DENIZLI-TAVAS Mn ORES OF TURKEY

摘要

Smelting of silicomanganese from Denizli-Tavas Mn ore (31%Mn) has been studied. Mixtures of calcined ore, active carbon, calcium oxide and quartz were smelted in graphite crucibles by using an electronically controlled muffle furnace. Temperature, time, charge basicity, active carbon/ore wt. ratio were determined as smelting parameters. Silicomanganese production necessitated higher temperatures compared to ferromanganese smelting since considerable amount of Si should be present in the final product. Oxides of iron and manganese were reduced faster, whereas sufficient time should be allowed for the system for desired reduction of SiO{sub}2. Determination of optimum charge basicity was crucial for silicomanganese production. Increase in quantity of active carbon led to increase in both Mn and Si recoveries. However, presence of excessive active carbon resulted in formation of carbides. Addition of high-manganese Brazilian sinter (53%Mn) to the domestic ore has also been studied in relation to both ferromanganese and silicomanganese smelting.