低钛高炉渣中Ti(C,N)形成的研究

Study on the Formation of Ti(C,N) in Low TiO_2 Content Blast Furnace Slag

高炉冶炼含钛矿过程易形成Ti(C,N),对渣铁的性质产生很大影响,研究高炉内Ti(C,N)形成对高炉冶炼有着重大意义。通过FactSage热力学计算软件,对低钛高炉渣中Ti(C,N)的形成以及影响因素进行了研究,并在实验室条件下对温度与铁液中钛含量的关系进行验证。结果表明:在低钛矿高炉冶炼中,Ti(C,N)开始形成温度为1 666 K,在1 783 K时,Ti(C,N)的形成量达到最大;温度,渣铁比,以及渣中TiO2的含量对Ti(C,N)的生成影响较大,Al2O3含量、MgO含量和炉渣二元碱度均可在一定程度上促进Ti(C,N)的形成,但影响较小。铁液中钛的含量主要受温度和Ti(C,N)反应平衡所控制,与渣中TiO2含量关系不明显。

During smelting of iron ore containing low TiO2 content in blast furnace（BF）, Ti（ C, N） easily forms, which has a great influence on the performance of the slag and hot metal. Therefore, the study on its formation is of great significance for BF smelting. In this paper, the formation of Ti（C,N） in low TiO2 con- tent slag and its influencing factors are studied with the software FactSage, and the relationship between temperatures and [ Ti ] in hot metal is verified under laboratory conditions. The results show that in BF smelting of low TiO2 content mineral, Ti（ C ,N） comes into being at 1 666 K, and reaches its maximum val- ue at 1 783 K. The temperature, ratio of slag to hot metal, and TiO2 content in the slag have greatest im- pact on the formation of Ti （C, N）, while the content of AI203 and MgO, and dual basieity of slag contrib- ute much less to its formation. The titanium content in hot metal is mainly affected by the temperature and Ti（ C ,N） reaction equilibrium, and has no obvious relationship with TiO2 content in the slag.