Experimental Study On Melt Reduction Of Titanium - Containing Iron Oxide By Oxygen Top - Blown

In the long production process, though heating and cooling materials frequently, then causing the loss of energy value is an important reason for high energy consumption of iron and steel industry. Therefore, developing high energy efficiency, strong adaptability to raw materials and burden, low investment cost, flexible operation and other characteristics of ironmaking-process has become one of the topics in the integrated iron and steel enterprises. The vanadium and titanium in Panxi region of Yunnan province and Sichuan are nearly4billion tons of ore reserves, but due to the difficult and ore smelting slag iron illiquid and hard to use in blast furnace. Therefore the development of rich oxygen top-blown smelting reduction with ilmenite ironmaking technology, because the smelting reduction furnace oxidizing atmosphere is strong, then promote phosphorus, titanium, silicon into the slag, so it can solve the problem of titaniferous ore smelting slag foaming. And Ti content in hot metal is very low.Therefore, to strengthen the research and development of the ironmaking technology smelting iron ore containing titanium, for energy conservation and emissions reduction, ironmaking is essential and necessary. Using chemical analysis, elemental analysis, X-ray diffraction, scanning electron microscope, electron spectroscopy and thermogravimetric analyzer and other test methods and instruments in the paper, Yunnan Meng Qiao ilmenite are analyzed with some important physical parameters, the mine main phase are Fe2O3, FeTiO3and TiO2, Ti content is6.47%.Through thermodynamic analysis of the reduction reaction of ilmenite, the reaction is feasible, and the solid carbon reductant works best. Rich oxygen top-blown smelting reduction technology of smelting titanomagnetite ore experimental research show that the technology is feasible, and experimental research on the basicity, reduction temperature, oxygen/carbon ratio, time, iron recovery, molten iron content of Ti and Fe, Ti, sulfur content of cast iron. Draw the following conclusions:(1) with reaction temperature, the rate of iron is on the rise, but after more than1500℃, the iron yield increase rate slows.(2) when the rate of iron alkalinity is less than1.2, with the improvement of alkalinity, its evident becomes obvious; When alkalinity is greater than1.2, the yield of iron slightly reduced.(3) the yield of iron with carbon increases with the increase of oxygen mole ratio, but its growth slows down gradually. One of the advantages of rich oxygen top-blown smelting reduction technology is to take off the Ti’s effect.(4) Ti content in molten iron is in the decline with the increase of reduction temperature, temperature increases, it changes the kinetics of the reaction conditions, so as to reduce the Ti content in the molten iron.(5) Ti content in cast iron with the increase of the ratio of carbon. With carbon ratio increased, it can make a small amount of reduction of titanium oxide of Ti and dissolve in the molten iron, thereby increasing the molten iron content of Ti (6) with the extension of time, Ti content in cast iron tend to decrease.(7) reaction temperature, alkalinity, and C/O on the influence of S content in hot metal is not huge, mainly because using strong oxidizing atmosphere in rich oxygen top-blown smelting reduction process.(8) the optimum conditions of smelting is at T=1550℃, C/O=1.0and R=1.2, iron yield can reach95%, less than0.05%of high quality molten iron and titanium content.(9) response surface optimization software to optimize the design and calculation of optimum technological parameters and the compared experiment has high inosculation, it can guide deeper experimental research in the future.