【摘要】 高炉冶炼高钛型钒钛磁铁矿的主要困难是由钛渣的特殊性质引起的,它们具有脱硫能力低、熔化性温度高以及高温还原变稠等特点,采用质量良好的原料,严格控制生铁含硅,选择适宜的炉渣碱度是解决高炉冶炼高钛型钒钛磁铁矿的主要措施。更多还原

【Abstract】 A large number of V-containing titanomagnetite ores have been found in the southwest part in China. The smelting of this kind of ores in blast furnace is often accompanied with a formidable difficulty for the presence of titanium dioxide up to 25% in slag. Which factors causing the problems in smelting process and what measures shold be taken effectively for solving the problems are investigated.Summary. In comparison with the ordinary slag, the titanium dioxide containing slag displays mainly three characteristics, ie.,--low desulfurization capability,eg. when CaO/SiO=1, for ordinary slag Ls (distribution coefficient of sulfur) is equal to 26, but for the slag containing 25% TiO2 it will only be 8;--high melting temperature, as 80-100℃ higher than ordinaryslag with a similar basicity;--high glutinousness, it is closely related to the reduction process of TiO2 and, the more thorough the reduction proceeds, the more glutinous the slag will be, even non-flowable.Smelting of titanomagnetite ores has been processed in China for many years. Based on the characteristics of titanium slag as above, special measures were taken in blast furnace operation , such as a requirement of high quality raw materials, exact control of silicon in pig iron and choosing proper basicity for slag.Fig.1 Ls(distribution coefficient of S) vs basicity(CaO/SiO2 ratio) for slags of different TiO2 contents Fig.2 Glutinousness vs temperature, for TiO2-containing blast furnace slagsFig.3 Glutinousness vs temperature, for slags at constant temperature (1500℃)Fig.4 Glutinousness vs temperature, for slags at different temperatures°--1550℃, ▲--1525℃; ×--1500℃.Fig.5 Time-dependent reduction rate curve°--V-bearing magnetite sinter;×--Anshan Steel Co. sinter.Tab.1 Relationship between distribution coefficient of S and TiO2content in slag Tab.2 Effects of the content of TiO2 and basicity of slag on itsmelting temperature Tab.3 Melting temperature of slag industrially measured更多还原