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为降低铁水的钛含量,采用烧结矿或铁精粉进行铁水包脱钛预处理。采用500kg中频感应炉对铁水脱钛进行了试验研究,并对脱钛过程热力学进行了分析。结果表明,相同温度下,烧结矿脱钛表观平衡常数明显大于铁精粉脱钛表观平衡常数。脱钛过程前4min平均脱钛速率最大,可达0.033%/min,16～20min阶段平均脱钛速率为0.000 7%/min。20min内,脱钛率可达57.19%～71.20%。脱钛剂中氧利用率的计算结果表明,终渣中剩余氧量占脱钛剂供氧量的4.8%～9.3%,脱钛氧利用率平均为12.28%,低于脱硅氧利用率(43.34%)和脱碳氧利用率(20.18%)。另外,试验结果表明,炉渣碱度增大,脱钛率提高。因此,为降低铁水钛含量,应适当提高脱钛渣碱度。
In order to reduce the content of titanium in hot metal, sinter ore or iron powder is used to pre-treat the hot metal. The 500kg medium frequency induction furnace was used to test the hot metal desilication, and the thermodynamics of the titanium removal process was analyzed. The results show that at the same temperature, the apparent equilibrium constant of desilication of sinter is obviously larger than that of desilverite. The average titanium removal rate was 0.033% / min 4 min before titanization and 0.000 7% / min at 16 ~ 20 min. Within 20min, the titanium removal rate can reach 57.19% ~ 71.20%. The results of the calculation of the oxygen utilization rate in the titanium removal agent showed that the residual oxygen in the final slag accounted for 4.8% -9.3% of the oxygen supply for the titanium removal agent and 12.28% on average, which was lower than the utilization rate of desiliconization 43.34%) and decarburization utilization (20.18%). In addition, the test results show that the basicity of the slag increases, the titanium removal rate increases. Therefore, in order to reduce the iron content of titanium, titanium should be properly increased alkalinity.