Effect of Modification Treatment for Reduction of Dephosphorization Slag in Hot Metal Bath  

作　　者：JIANG Mao-fa CUI Yu-yuan WANG De-yong MIN Yi LIU Cheng-jun 

机构地区：[1]Institute of Ferrous Metallurgy,School of Materials and Metallurgy,Northeastern University

出　　处：《Journal of Iron and Steel Research International》2013年第1期1-6,20,共7页

基　　金：Item Sponsored by National Natural Science Foundation of China(50904017);Fundamental Research Funds for Central Universities of China(100402016);Postdoctoral Science Foundation of China(2011M500823)

摘　　要：To extract the valuable elements from the steel slag, a novel approach has been proposed by modification treatment to provide the stronger driving forces and accelerate the reduction. Three types of dephosphorization steel slags were reduced using carbon-saturated iron bath to extract iron and phosphorus simultaneously. During the process of reduction, slag composition, temperature, and original P2O5 content were investigated respectively. Slag modification treatment, adding either silica or alumina to vary the slag composition, was proven to accelerate the reduction of dephosphorization slag. The equilibrium time can be shortened from 60 to 30 min. Slag modification also allowed the reduction reaction to occur at lower temperature. After slag modification, the original P2O5 content in slag presents a slight difference on reduction process. Almost half of the reduced phosphorus was vaporized within 5 and 20 min. As more and more FeO was reduced, CO gas generation decreased, and evaporation amount of phosphorus therefore decreases.To extract the valuable elements from the steel slag, a novel approach has been proposed by modification treatment to provide the stronger driving forces and accelerate the reduction. Three types of dephosphorization steel slags were reduced using carbon-saturated iron bath to extract iron and phosphorus simultaneously. During the process of reduction, slag composition, temperature, and original P2O5 content were investigated respectively. Slag modification treatment, adding either silica or alumina to vary the slag composition, was proven to accelerate the reduction of dephosphorization slag. The equilibrium time can be shortened from 60 to 30 min. Slag modification also allowed the reduction reaction to occur at lower temperature. After slag modification, the original P2O5 content in slag presents a slight difference on reduction process. Almost half of the reduced phosphorus was vaporized within 5 and 20 min. As more and more FeO was reduced, CO gas generation decreased, and evaporation amount of phosphorus therefore decreases.

关 键 词：dephosphorization slag REDUCTION modification treatment phosphorus vaporization 

分 类 号：X757[环境科学与工程—环境工程]