Effects of B2O3 and TiO2 on crystallization behavior of some slags in Al2O3-CaO-MgO-Na2O-SiO2 system
Nowadays, there are increasing demands for developing mould fluxes without fluoride due to environmental concerns. Slag bearing titanium oxide and/or boron oxide proved to be promising substitute for traditional mould fluxes with fluoride. In the present work, Crystallization behaviors of some slags in Al2O3-CaO-MgO-Na2O-SiO2-B2O3-TiO2 system were investigated using Single Hot Thermocouple Technique (SHTT), Differential Thermal Analaysis (DTA) and X-ray diffraction (XRD) techniques. It was found that the liquidus temperature of slag decreases with increases of B2O3 content. The XRD analysis on the crystallized samples shows that crystallization products are perovskite, gehlenite and wollastonite. Time- Temperature- Transformation diagrams (TTT) for various slags have been constructed using SHTT technique. It was found that B2O3 can significantly increase the incubation time for crystallization of slags. The incubation time for crystallization of slags decreases with increase of titanium oxide content from 5％ to 10％. The morphology of crystals was also investigated using SHTT technique. At higher temperature, dendrites and columnar crystal tend to form and grow with time progress, while at lower temperature, small crystals appear and the amount of crystal increase with time increasing.
Non-fluoride mould fluxes crystallization single hot thermocouple DTA
Qifeng SHU Zhen WANG Jeferson L.KLUG Kuochih CHOU Piotr R.SCHELLER
School of metallurgical and ecological engineering, University of Science and Technology Beijing, Be School of metallurgical and ecological engineering, University of Science and Technology Beijing, Be Institute of iron and steel technology, Freiberg university of mining and technology, D-09596 ,Freib Institute of iron and steel technology, Freiberg university of mining and technology, D-09596 ,Freib
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）