Liquidus temperatures and viscosities of Shougang iron blast furnace slags
The blast furnace process continues to be the principal technique used for ironmaking in the world, contributing to over 1 billion tonnes of steel production annually world wide. The impurities present in the original ore result in several hundred million tonnes of waste product in the form of complex oxides, known as slag. The major chemical components of the iron blast furnace slag are Al2O3, CaO, MgO and SiO2 that account for over 95 weight percent. Phase equilibria and viscosity data in the system Al2O3-CaO-MgO-SiO2 have been used for iron blast furnace slag for many years. In addition to major components, minor components such as sulphur, TiO2 and FeO are also present in the iron blast furnace slags. Modern ironmaking industry requires more accurate data to optimise operation of the blast furnace. In the present study granulated iron blast furnace slags have been collected from Shougang. Liquidus temperatures of these industrial slags have been determined by high temperature equilibration, quenching and Electron Probe X-ray Microanalysis (EPMA) technique. The viscosities of the industrial slags have been measured using the custom designed rotating bob apparatus which enables control of the gas atmosphere and rapid quenching of the samples on completion the experiment. The microstructures and phase compositions in the quenched slag samples after the viscosity measurements are determined by EPMA. Corresponding synthetic slags have been used to evaluate effects of minor components such as sulphur, TiO2 and FeO on liquidus temperature and viscosity of the iron blast furnace slags. It was found that the liquidus temperatures of the industrial BF slags are in the range of 1410 to 1440 oC. The liquidus temperatures of the synthetic slags are 40-50 degrees higher than the corresponding industrial slags. Presence of minor components such as sulphur, TiO2 and FeO in the slag appear to decrease of the liquidus temperature. The viscosities of the industrial BF slags are in the range of 0.3 to 0.4 Pa.s at 1500 oC. The viscosities of the synthetic slags are 30％ higher than that of corresponding industrial slags at 1500 oC. The differences of liquidus temperatures and viscosities between industrial slags and synthetic slags will provide useful indications that will assist the application of the results of the synthetic slags to improve the operation of the iron blast furnace.
ironmaking blast furnace slag liquidus temperature viscosity
Baojun Zhao Dianwei Zhang Zhixing Zhao Evgueni Jak Peter Hayes
Pyrometallurgy Research Centre, The University of Queensland, Brisbane, QLD 4072, Australia Shougang Research Institute of Technology, 69 Yangzhuang Street, Shijingshan District, Beijing, Chin
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-10
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）