Basic Research On The Related Technology Of High Efficient Extraction Of Vanadium From Hot Metal By BOF

Vanadium is an important strategic materials, known as the "modern industrialMSG”, which is widely used in iron and steel industry, chemical industry, aerospaceindustry, textile industry and medical fields. Vanadium Fu exist in nature mainlyvanadium iron magnetite in the Panzhihua region in China has rich resources ofvanadium and titanium magnetite.Vanadium resources commonly used process is torestore the vanadium iron magnetite containing vanadium hot metal recovery from theferro-vanadium magnetite, and then containing vanadium oxide in vanadium hot metalinto the slag in the extraction of V₂O₅from vanadium slag, followed by the wet process.China and Russia have adopted converter vanadium process. After years of efforts,Panzhihua Iron and vanadium resources development and utilization achieved goodresults, but now process the vanadium recovery rate of less than others’, the grade ofvanadium slag, vanadium oxidation rate and so needs to be improved. In addition, forthe molten iron content of about0.3%[V] of the converter vanadium few studies.Therefore it is necessary to find out the low vanadium hot metal mention vanadiummechanism and influencing factors. Automatic control model has been successfullyapplied on a BOF steelmaking, but due to the short duration of heat, to mentionvanadium converter Vice-gun, smoke detection equipment, the converter vanadiumcontrol in a static control. China’s vanadium extraction operation still use the manualoperation, by virtue of the experience of operating workers control, which led to thesemi-steel, vanadium slag unstable quality. Develop a Chinese characteristics vanadiumcontrol model to meet the requirements of the times. Problems in our country convertervanadium process to carry out basic research, the following conclusions:①Converter vanadium thermodynamic study found that the hot metal vanadiumis oxidized to V³⁺, a small part is oxidized to V²⁺; vanadium slag in the iron Fe²⁺andFe³⁺in two forms. Activity and the activity coefficient of FeO in the slag with the slag,MnO, FeO content increases with increasing, with the residue with V₂O₃, SiO₂and TiO₂content increases and decreases, and its value, respectively,10^-1 and100orders ofmagnitude, the trend of the activity and the activity coefficient of V₂O₃in the slag underthe same conditions and FeO values were10^-2and10^-1of magnitude.②Converter vanadium kinetic studies, found that the molten iron of Si by astrong inhibitory effect on the oxidation of C and V, the molten iron initial Si content increases will allow the molten iron in the oxidation rate of C and V significantlyreduced, and lead tothe end of V content in hot metal; molten iron initial V content willmake it itself is oxidized to reduce the rate to speed up a slight inhibition of it, while Cin the molten iron oxide reduction rate slows down, and the end of V content in hotmetal will rise; temperature C is oxidation rate to accelerate substantially the same timeso that V is oxidized in hot metal rate has slowed down significantly; rapid generationof FeO in the slag can contribute to C, V-oxidation。③The vanadium extraction with the cooling efficiency of the coolant found byDSC to study the solid high-temperature specific heat is feasible, and the results aremore accurate. The cooling capacity of the coolant following order: cold pellets> neverresidue> vanadium slag of pig iron. Coolant in the cooling effect of different endpointtemperature can provide guidance for the optimization of the converter vanadiumprocess.④Theoretical analysis on anthracite pointed out that the the anthracite joined atdifferent times with different functions: pre-join can increase the temperature of thesemi-steel, while increasing carbon; late to join the anthracite can improve VanadiumSlag TFe content. But the two join the way will make the semi-steel residue V content isslightly higher. The statistical analysis of data, add1kg of anthracite coal the1tdesulfurization of iron by carbon0.03percent, to mention the temperature of7.35°C;ordinary iron can increase the carbon0.025%, to mention a temperature4.83°C.⑤Research on material balance and heat balance show that, material balancedetermination of the results of error of-0.86%2.88%-3.12%3.94%error ofdetermination of thermal equilibrium results. The study found that leaving residueoperation of Vanadium, blowing to reduce the losses with the increase in the numberleaving residue.⑥The neural network method, combined with previous research on VanadiumExtraction parameters, is used to build a vanadium exreaction control model, includingthe model of coolant, oxygen model, the end of prediction model words model. Modelprogramming language is C++. Finally established a simulation model, model trainingresults indicated that this model can basically meet the control requirements ofvanadium extraction smelting.