Study On Metallugical Property Of BF Slag In Jiuquan Iron&Steel Corp

Based on furnace slag of Jiugang,the mineral composition and metallurgical properties of jiugang BF slag have been researched in laboratory,the influence of CaO/SiO2 ,MgO,Al2O3,MnO,BaO,TiO2 and CaF2 to metallurgical properties of slag have been studied. The study include the mineral composition and microstructure study by OM,SEM,etc;viscosity and melting temperature study ;desulphurizing capacity study.The results showed as follows :The mineral of slag in Jiugang was made up of melilite mostly,composed of wollastonite ,silicoglaserite,dicalcium silicate,cuspidine and fluorite partly.The slag belong to short slag,which viscosity was lower than 0.75 Pa·s with high temperature and have a good fluidity,but round melting temperature,viscosity of slag become high fastly with temperature fall,and its free flow range is only about 20℃,so it is important to control slag temperature for good fluidity.According to fluidity, desulphurizing ability and hing burthen of sulphur.the CaO/SiO2 should be decrease to 1.10 from 1.15 by adjust vosicity and percentage of sinter,the content of MgO% should be increased from 6% to 9% by increase content of MgO% of sinter,the content of Al2O3% should be maintained immovability,the conten of MnO% should be increased.The content of TiO2% should be kept about 1%-2% using sinter mix and adding navajoite and ilmenite to blast furnace.As viscosity of slag is high, the content of BaO% should be deceased by sinter mix,as content of BaO% is high, the CaO/SiO2 should be decreased.At especial condition the content of CaF2% should be increased by sinter mix and add fluorite to blast furnace,the content of CaF2% of slag should be 1%-2%,and it shouldn't be a long system for add fluorite to blast furnace.