1. State Key Laboratory of Advance Steel Processes and Products， Central Iron and Steel Research Institute， Beijing 100081， China 2. School of Material and Metallurgy， Northeast University， Shenyang 110819， Liaoning， China
Abstract：The smelting slag reaction mechanism was studied by thermodynamic analysis and coal-based direct reduction and smelting experiment. The experiment result shows that the slag basicity has an important influence on iron nuggets size， metal yield and slag composition. When the basicity were 1.00， 2.00 and 3.85， the iron nuggets yield were 91.55%， 44.53% and 88.48% respectively， the iron nuggets size were 15.50， 7.00 and 8.54mm respectively， and the smelting slag composition (mass percent) were 55%A-34%CA6-6%C2AS-4%Fe， 64%A-35%C2AS-2%Fe and 24%C2S-62%C12A7-7%C2AS-4%C3AS3-3%Fe respectively. When the slag basicity was 3.85， the reduction smelting slag is mainly composed of C2S and C12A7， which mass percent is about 85%. Only when the mixture is close to the slag line of C2S-C12A7 ([R]=3.85)， the C2S and C12A7 will appear in the cooling crystallization equilibrium phase.
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2015, Vol. 50 
