Relationships between sulfur distribution ratio of molten slag and metal and that of tellurium
Molten slag treatment is essential for special steels in the modern steelmaking process. When molten slag is added to molten steel, several chemical reactions between the molten slag and steel take place. One of the main purposes of secondary refining is to control the components of molten steel and this also requires the composition of molten slag to be well controlled. The distribution ratio of molten slag and metal is the index related to the refining and is applied to evaluate the refining ability of the molten slag. Sulfur is one of the chalcogens which are in group 16 of the periodic table. Since the qualities of steel are strongly affected by sulfur, clarifying the sulfur distribution ratio is important. It is known that sulfur distribution ratio is affected by the basicity of the molten slag and partial pressure of oxygen in the molten steel. Tellurium is also a chalcogen and its thermochemical properties are similar to sulfur but are not so well-known. In this study the tellurium distribution ratio of the molten slag and metal was experimentally estimated and the relationships between sulfur distribution ratio and that of tellurium were clarified. Experiments were conducted with CaO-SiO2-Al2O3-MgO and CaO-SiO2-MnO-MgO slags. By using the experimental results, tellurium distribution ratio was estimated by means of the sulfur distribution ratio. The relationship between optical basicity and sulfide capacity had already been reported so that sulfur distribution ratio could be calculated with the molten steel and slag components and temperature. Calculated and observed tellurium distribution ratios were compared and they were in good agreement with each other regardless of slag components and temperature.
Distribution ratio Tellurium Chalcogen Optical basicity
Atsushi Okayama Takayuki Nishi
Steelmaking Research and Development Department, Corporate research and Development Laboratories, Sumitomo Metal Industries, Ltd., 16-1, Sunayama, Kamisu, Ibaraki, 314-0255, Japan
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
1-6
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）