含钛铁水转炉冶炼及其预脱钛行为研究

Research on titanium-containing molten iron converter smelting and its pre-detitanium behavior

基于河钢集团唐钢公司150 t转炉含钛铁水冶炼实绩,采用冶金热力学分析和现场试验相结合的方法,研究了含钛铁水转炉造渣冶炼及其预处理喷氮预脱钛行为。研究结果表明:铁水钛的质量分数在0.12%以下时,转炉采用单渣法冶炼,可控制喷溅。向含钛铁水中喷吹氮气,促使氮化钛类物质析出,从而降低铁水钛含量的方法可行。铁水氮含量越高、温度越低,越有利于铁水脱钛反应的进行。平衡条件下,铁水温度和钛的质量分数分别控制在1573 K和0.12%时,铁水中平衡溶解氮的质量分数在13×10-6;铁水预处理喷氮气预脱钛,其脱钛率在20%左右。

Based on the smelting performance of titanium-containing molten iron in a 150 t converter of HBIS Group Tangsteel Company, the behavior of titanium-containing molten iron converter slag making and its de-titanium pretreatment with nitrogen injection were studied with metallurgical thermodynamic analysis and field test. The results showed that the converter could control splash with single slag method when the titanium mass fraction controlled below 0.12 % in molten iron. The method of blowing nitrogen into the titanium-containing molten iron to promote the precipitation of titanium nitrides, thereby reducing the content of titanium in molten iron was feasible. It was beneficial for de-titanium reaction together with nitrogen mass fraction increasing and temperature decreasing in molten iron. When the temperature of molten iron and titanium mass fraction were controlled at 1 573 K and 0.12 % respectively, the balanced dissolved nitrogen mass fraction in molten iron was 13×10-6 under equilibrium conditions. The de-titanium rate was about 20 % in the process of de-titanium pretreatment by hot metal nitrogen injection.