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Slag/metal separation process of the highly reduced oolitic high-phosphorus iron ore fines was investigated.Samples were prepared using the reduced ore fines(metallization rate:88%)and powder additives of CaO and Na2CO3.Slag/metal separation behavior tests were conducted using aquenching method and the obtained metal parts were subjected to direct observation as well as microstructure examination with SEM and EDS;iron recovery and phosphorus distribution tests were conducted using a Si-Mo high temperature furnace and the obtained metal parts were examined by ICP-AES analysis and mass measurement.Thermodynamic calculation using coexistence theory of slag structure was also performed.Results show that temperature for slag/metal separation must be higher than1 823 Kand a satisfying slag/metal separation of the highly reduced ore fines needs at least 4min;phosphorus content of hot metal is mainly determined by thermodynamics;temperature of 1 823-1 873 Kand Na2CO3 mixing ratio of about 3% are adequate for controlling phosphorus content to be less than 0.3mass%in hot metal;temperature,time and Na2CO3 mixing ratio do not have significant effect on iron recovery,and iron recovery rate could be higher than 80% as long as a good slag/metal separation result is obtained.
Slag / metal separation process of the highly reduced oolitic high-phosphorus iron ore fines was investigated. Samples were prepared using the reduced ore fines (metallization rate: 88%) and powder additives of CaO and Na2CO3.Slag / metal separation behavior tests were conducted for the using aquenching method and the obtained metal parts were subjected to direct observation as well as microstructure examination with SEM and EDS; iron recovery and phosphorus distribution tests were conducted using a Si-Mo high temperature furnace and the obtained metal parts were examined by ICP-AES analysis and mass measurement. thermodynamic calculation using coexistence theory of slag structure was also performed. Results show that temperature for slag / metal separation must be higher than 1 823 Kand a satisfying slag / metal separation of the highly reduced ore fines needs at least 4min; content of hot metal is mainly determined by thermodynamics; temperature of 1 823-1 873 Kand Na2CO3 mixing ratio of about 3% a re adequate for controlling phosphorus content to be less than 0.3 mass% in hot metal; temperature, time and Na2CO3 mixing ratio do not have significant effect on iron recovery, and iron recovery rate could be higher than 80% as long as a good slag / metal separation result is obtained.