Dephosphorization stability of hot metal by double slag operation in basic oxygen furnace

作     者：Wei Wu Shi-fan Dai Yue Liu 

作者机构：Metallurgical Technology Research DepartmentCentral Iron and Steel Research InstituteBeijing 100081China Hai Yi Tong Special Material Co.Ltd.Wuhan 430082HubeiChina 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2017年第24卷第9期

页      面：908-915页

核心收录：

学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：financially supported by the Beijing Natural Science Foundation of China(No.2172057) 

主　　题：Medium phosphorus hot metal Double slag operation Dephosphorization rate Phosphorus capacity Basic oxygen furnace 

摘      要：Double slag process was adopted to produce low-phosphorus steel from middle-phosphorus hot *** achieve a stable dephosphorization operation,conventional process was modified as follows：the blowing time was extended by approximately 1min by reducing the oxygen supply flow rate;calcium ferrite pellets were added to adjust the slag composition and viscosity;the dumping temperature was lowered by 30-50°C by the addition of calcium ferrite pellets during the double slag process to prevent phosphorus in the slag from returning to the molten steel;and the bottom-blown gas flow was increased during the blowing *** 40 heats of comparative experiments,the rate of dephosphorization reached 91% and ranged between 87% and 95%;the phosphorus,sulfur,manganese,and oxygen contents calculated according to the compositions of molten steel and slag as well as the temperature of molten steel at the end-point of the basic oxygen furnace process were similar to the equilibrium values for the reaction between the slag and the *** free calcium oxide and metallic iron were present in the final slag,and the surface of the slag mineral phase was smooth,clear,and well developed,which showed that the slag exhibited better melting effects than that produced using the conventional slag process.A steady phosphorus capacity in the slag and stable dephosphorization effects were achieved.