WANG Chengli1，L Qing2，MA Mingxin2，LIU Shuguang2，HOU Dahua3
1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004， Liaoning,China; 2. School of Metallurgy and Energy Resources, Hebei Polytechnic University, Tangshan 063009,Hebei,China; 3.Guangzhou Iron and Steel Group Co.， Ltd., Guangzhou 510381,Guangdong,China
Abstract：In order to reduce harmful effect of alkali metals on blast furnace operation, improve the alkali capacity of BF slag, the potassium capacity of BF slag was studied at 1723 K using gasslag equilibrium technique. According to the real composition of BF slag at Guangzhou steel, the pure chemistry reagents were used to make the slags，the slags were equilibrated with a mixture gas of K(g)COCO2Ar to provide the partial pressure of oxygen and potassium. Under the experimental condition, it is shown that at fixed MgO and Al2O3 contents the potassium capacity is decreased with increasing w(CaO)/w(SiO2) ratio, at constant w(CaO)/w(SiO2) ratio and Al2O3 content the increase of MgO content results in the increase of potassium capacity, the rising Al2O3 content at fixed w(CaO)/w(SiO2) ratio and MgO content significantly increases the potassium capacity, and at constant (w(CaO)+w(MgO))/w(SiO2) ratio and Al2O3 content, the potassium capacity increases apparently with increasing MgO content and decreasing CaO content. The proper composition of slag at Guangzhou steel is:w(CaO)/w(SiO2)=1.0, MgO content in the range of 12%15%, Al2O3 content less than 15%.
2006, Vol. 41 
