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Study on Oxidation Kinetics of Vanadium in Vanadium Recovery from Hot Metal Containing Vanadium

Author: LiDanKe
Tutor: WangYu
School: Chongqing University
Course: Metallurgical Engineering
Keywords: Vanadium oxide Hot metal vanadium extraction Oxidation Kinetics Restrictive aspects The apparent rate constant
CLC: TF801
Type: Master's thesis
Year: 2009
Downloads: 173
Quote: 1
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Abstract


Converter vanadium vanadium oxidation reaction kinetics of the slag process conditions determine the vanadium oxidation rate and the conversion rate, is the development and optimization of the process on the basis vanadium extraction, the oxidation kinetics vanadium grade and vanadium extraction efficiency of vanadium slag and molten iron has close relationship, but few studies and reports in this regard. Vanadium extraction process for converter molten iron, vanadium oxidation kinetics of vanadium-containing molten iron. Through analysis and experimental study of vanadium-containing molten iron vanadium oxidation mechanism, to further clarify the form of the transition and the presence of vanadium valence of vanadium slag the the vanadium oxidation kinetics model was constructed in the laboratory to carry out the conditions of molten iron and vanadium slag composition on The vanadium oxidation rate studies to determine the restriction part of the reaction and the rate constant. Provide a theoretical basis to optimize the the existing vanadium extraction process, improve the of vanadium slag taste and vanadium recoveries. The main findings are as follows: ① vanadium in vanadium-containing molten iron oxidation reaction mechanism analysis and experimental research to determine the vanadium oxidation reaction product. The results show that: Vanadium is primarily oxidized to V3, a small portion is oxidized to V2, slag iron the Fe 2 the the Fe 3 form exists. Vanadium hot metal is oxidized to V 2 O 3 , V to 2 O 3 and FeO reaction generated FeV 2 O 4 , and Fe2O3, FeO reaction to generate the Fe 2 VO 4 . Theoretical calculation of the transition temperature of the vanadium oxidation reaction, vanadium extraction reaction temperature should be around 1380 ℃. (2) by changing the initial molten iron in% V] content, the oxidation reaction temperature, slag and iron than oxidants FeO and SiO2 content of the hot metal vanadium extraction of vanadium oxidation reaction kinetics. Study showed that: the lower reaction temperature of the molten pool increased the initial iron vanadium content, using high (FeO) and the lower of SiO 2 content of the slag, increasing the added amount of slag can be promoted vanadium The oxidation reaction, there are conducive to improving the rate of oxidation of vanadium. Vanadium hot metal oxidation kinetics model ③ double membrane theory constructed through the experimental studies, vanadium hot metal oxidation reaction is a reaction, V in hot metal diffusion and V 2 O 3 in the slag phase diffusion is the the vanadium oxidation reaction of restrictive. ④ under the experimental conditions analyzed and calculated apparent rate constant k 'in the range of 0.035 ~ 0.123min-1, the vanadium oxide in the molten iron in the rate equation can be expressed as:

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > General issues > Theoretical and Computational
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