Matching of slag composition,performance and furnace temperature based on double slag process
In the process of converter smelting,the temperature of molten pool,the composition of metal and the composition of slag are constantly changing,which leads to the change of slag performance and has an important influence on the smelting process and the quality of molten steel.The double-slag process is a new converter steel-making process that has received extensive attention in recent years.However,there is a lack of systematic research on the coupling and matching of slag composition and performance changes with temperature and their effects during the slag formation process of double-slag process.Based on the conditions of a steel plant,the material balance was established,and the effects of slag retention and slag dumping on slag composition and dephosphorization ability were calculated.In addition,based on the production data of double-slag process of slag formation,the related research of double-slag process and the reasonable selection and calculation of slag performance model,the changes of bath temperature,slag composition,slag melting point and viscosity,phosphorus capacity,phosphorus distribu-tion ratio and sulfur capacity in the process of converter double-slag smelting are sorted out.The matching status of various parameters in the converter steelmaking process is analyzed,and its influence on dephosphorization and desul-furization effect is discussed,which can provide reference for the implementation and optimization of the double-slag process in the plant.The results show that compared with conventional smelting,the consumption of slag and iron loss are significantly reduced by double slag and slag retention method.The consumption of lime in the enterprise is reduced from 34.07 kg/t to 17.04 kg/t,and the consumption of light burnt dolomite is reduced from 14.07 kg/t to 8.89 kg/t.The dephosphorization distribution ratio is higher and the dephosphorization effect is better.At the same time,the stable control of slag retention and slag dumping has an important influence on the performance of slag.In the early stage of smelting,the late stage of dephosphorization stage and the early stage of decarburization stage,the phenomenon that the melting temperature of slag is still higher than the furnace temperature is still easy to occur,and attention should be paid to the slag melting.In addition,the temperature of molten pool in the early stage of con-verter double slag smelting is relatively low,and the good matching of slag fluidity and dephosphorization ability is the key to the efficient dephosphorization of this process.
converter steelmakingslag-retention and double slag processdephosphorizationslag compositionslag propertycoupling and matching
NETL
NSTL
万方数据
