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Liu D.-H.,Hebei United University | Lu Q.,Hebei United University | Zou L.-L.,Hebei United University | Chen S.-J.,Chengde Iron and Steel Company | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2014

The influence of the ratios of limonite on the basic characteristics of vanadium titanium magnetite was investigated. The results show that the assimilation temperature of vanadium titanium mixed ore decreases with the increasing of the ratio of limonite. The liquid phase fluidity index of vanadium titanium mixed ores rises with the increasing of the ratio of limonite. The binding phase strength of vanadium titanium mixed ores rises at first and then decreases with the increasing of the ratio of limonite. The assimilation temperature of vanadium titanium mixed ores is 1302~1315°C, the liquid phase fluidity index is 1.12~1.32 and the binding phase strength is 4628~5198N in different ratios of limonite. Based on comprehensive utilization of low-priced materials, decrease the cost of production and improve the quality of vanadium-titanium sinter, analyzed the influence of the ratio of limonite on the basic characteristics of vanadium titanium magnetite, the sintering ore-blending scheme is best when the ratio of limonite is 10% and the total ratio of limonite is 37.2%. Source


Liu F.,University of Science and Technology Beijing | Zhu R.,University of Science and Technology Beijing | Wang Q.,University of Science and Technology Beijing | Bai R.,Chengde Iron and Steel Company
ISIJ International | Year: 2015

Characteristics of flow field and stirring effects of top lance with various tilt angles (Tilt angles were 39°, 41°, 43°, 45° and 47°, respectively) on the molten bath were studied. The mixing time, impacting depth and impacting diameter were measured by water experiment. Flow field characteristics of three-phase flow were simulated by Fluent software. It was found that 43° oxygen lance could get the shortest mixing time being 56 s, the medium impacting depth being 36 mm and medium impacting diameter being 115 mm. When injecting by the 43° oxygen lance, average flow velocity of molten bath was the biggest being 0.0329 m/s, and volume of dead-zone was the minimum being 1.90 m3. In order to study metallurgical effects of oxygen lance with tilt angle, both 43° and 45° oxygen lances were experimented in a dephosphorization ladle furnace. The experiment showed that the oxygen lance with tilt angle can guarantee the normal smelting process. Compared with the 45° oxygen lance, the content of phosphorus in semi-steel B was decreased by 0.012 mass%, the dephosphorization rate was increased by 7.9% and the content of T. Fe loss was dropped by 1.9 mass%. It proved the oxygen lance with tilt angle could get a remarkable dephosphorization effect in a ladle furnace. Source


Liu F.-H.,University of Science and Technology Beijing | Zhu R.,University of Science and Technology Beijing | Wang Q.-G.,University of Science and Technology Beijing | Bai R.-G.,Chengde Iron and Steel Company
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2016

Characteristics of flow field and stirring effects of top lance with various tilt angles (Tilt angles were 39°, 41°, 43°, 45° and 47°, respectively) on the molten bath were studied using water experiment and Fluent software. It was found that appropriate tilt angle could improve dephosphorization process, and too large and too small reduced the impacting depth and impacting diameter, respectively, leading to decrease in dephosphorization rate. When injecting by the 43° oxygen lance, impacting depth and impacting diameter were medium, mixing time and volume of dead-zone were the minimum and average flow velocity of molten bath was the biggest. This is helpful to promote phosphorus dispersion in dephosphorization ladle furnace and improve the dephosphorization rate. Based on the results of industrial application research, the 43° oxygen lance could stir the molten bath better, increase the dephosphorization rate and reduce the consumption of hot metal and scrap. © All right reserved. Source


Liu D.-H.,Hebei United University | Lu Q.,Hebei United University | Zou L.-L.,Hebei United University | Sun Y.-Q.,Hebei United University | And 2 more authors.
Journal of Iron and Steel Research | Year: 2015

The effect of mixed ores basic characteristics on tumbler index of vanadium-titanium sinter was investigated. The results show that the tumbler index of vanadium-titanium sinter rises with the increasing of the assimilation temperature of mixed ores. The tumbler index of vanadium-titanium sinter rises at first and then decreases with the increasing of the liquid phase fluidity index of mixed ores. The tumbler index of vanadium-titanium sinter rises with the increasing of the binding phase strength of mixed ores. The tumbler index of vanadium-titanium sinter and basic characteristics of mixed ores were analyzed by SPSS software, the relationship between basic characteristics of mixed ores and the tumbler index of vanadium-titanium sinter was obtained. Source


Lv M.,University of Science and Technology Beijing | Zhu R.,University of Science and Technology Beijing | Wang H.,University of Science and Technology Beijing | Bai R.,University of Science and Technology Beijing | Bai R.,Chengde Iron and Steel Company
Steel Research International | Year: 2013

Stirring effects and impacting characteristics of conventional and various swirl-type oxygen lances (Swirl angles are 5°, 10°, and 13°, respectively) on the molten pool were studied. The mixing time, impacting depth and impacting diameter were measured by water model experiment. The flow field characteristics of gas-liquid two phase flow were simulated using Fluent software. It is found that 10° swirl-type oxygen lance injection can get the shortest mixing time which is only 47.6 s. The area surrounded by isovelocity is larger in molten pool when injecting by the swirl-type oxygen lance. When injecting by the 10° swirl-type oxygen lance, the area is the largest and the flow velocity of liquid steel is the highest. On this basis, the 10° swirl-type oxygen lance was experimented in 150 t vanadium extraction converter. The experiment shows that the swirl-type oxygen lance can guarantee the normal smelting process. Compared with the conventional oxygen lance, the reduction ratio of vanadium content in semi-steel is 17.8%, vanadium extraction rate is increased by 5.1%, V2O5 grade of vanadium slag is increased by 0.93% and iron loss is reduced. It provides a new technology to improve the recovery of vanadium resources in converter. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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