1. Department of Metallurgical Technology Research, Central Iron and Steel Research Institute, Beijing 100081, China; 2. Steelmaking Plant, Sichuan Desheng Group Vanadium and Titanium Co., Ltd., Leshan 614900, Sichuan, China
Abstract:In order to solve the problem of residual vanadium in semi-steel and high metal iron in slag caused by the poor stirring ability of molten bath for vanadium extraction furnace, a circular seam bottom blow gas supply element was adopted in the process of vanadium extraction from vanadium-containing hot metal in vanadium extraction converter. A bottom blow process suitable for vanadium extraction from hot metal was developed, and industrial trial was carried out. Through investigation, it is found that the capillary-type gas-permeable brick has the problem of low bottom blowing stirring intensity and easy blockage during use of vanadium-extracting furnace. Change the capillary-type gas-permeable brick to circular seam bottom blow gas supply element. On this basis, the appropriate bottom blowing and top blowing process modes for vanadium extraction were determined by numerical simulation calculation and cold state simulation experiment, and the industrial test plan was formulated accordingly. The numerical simulation results show that with the increase of distance between the bottom blow gas supply element and the center of furnace bottom, the percentage of dead zone in the molten bath increases. The best opening position of the bottom blow element is selected at 0.45D from the center of the working layer (D is the diameter of the molten bath). The results of water model experiment show that under the condition of top blowing flow rate of 11 000-15 400 m3/h, the suitable bottom blowing gas supply intensity is 0.05-0.08 m3/(t·min). Industrial test results show that after optimization of bottom blow process, the average values of vanadium and carbon mass percent in the semi-steel are 0.033% and 3.35%, respectively, the former is 0.004% lower than that before the process optimization, and the later increases by 0.1%. The average values of vanadium oxide mass percent and metallic iron mass percent in vanadium slag are 18.99% and 22.25%, respectively. Compared with the process before optimization, the vanadium oxide mass percent increases by 0.67% and the metallic iron mass percent decreases by 3%. This shows that after the process is optimized, the stirring conditions of molten bath are improved, and the vanadium oxide reaction is more complete. The practice has proved that the circular seam bottom blow gas supply element has the characteristics of high bottom-blowing strength, easy maintenance, not easy to be blocked, safe and reliable, and is suitable for the process of vanadium extraction from hot metal in vanadium extraction converters.
赵进宣, 肖峰, 赵博, 李相臣, 吴巍, 吴伟. 环缝式底吹供气元件在铁水提钒中的应用[J]. 钢铁, 2022, 57(8): 89-93.
ZHAO Jin-xuan, XIAO Feng, ZHAO Bo, LI Xiang-chen, WU Wei, WU Wei. Application of circular seam bottom blow gas supply element in extracting vanadium from vanadium-containing hot metal[J]. Iron and Steel, 2022, 57(8): 89-93.
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