Investigation on removal of Nb from Nb-bearing hot metal with CO₂

• Main Authors: Z. Y. Xu, J. N. Huang, B. W. Li, Z. W. Zhao
• Format: Article
• Language: English
• Published: Croatian Metallurgical Society 2018-01-01
• Series: Metalurgija
• Subjects: hot metal; removal of Nb; bottom-CO₂; time; temperature
• Online Access: http://hrcak.srce.hr/file/296941
• ISSN: 0543-5846; 1334-2576

This paper focuses on removal niobium from Nb-bearing hot metal by bottom blown-CO₂ gas at flow rate of 1,0×10³ Nm³/h, 1,5×10^-3 Nm³/h at 1350 °C and 1 450 °C in a medium induction furnace. The results show that Nb and P are oxidized and the ratio of Nb to P in Nb-bearing slag at blowing termination reaches to 46,66 at 1350 °C and CO₂ flow rate of 1,5m³/h, which is more than that in the other condition; it improves to remove more Nb from hot metal with bottom-blown CO₂ at 1 350 °C than at 1450 °C; Nb starts to oxidize by CO₂ to form slag when Si content in molten iron decreases to low 0,1 wt. %.