| For the past few years, the demand for steel of our country is strongly increasing. The reserves of iron ore is high in China, but because the ore of China is more the lean, less rich deposits,it is a part of the mineral can’t be exploited and utilized. There are billions of tons of steel of high phosphorus iron ore around the Kunming Steel of Yunnan province. But the grade of the iron is low, phosphorus and silicon content are high, and it is difficult to be exploited and utilized. In view of its characteristic,in this paper phosphorus iron ore of Huimin mixed the premelted dephosphorizer (The premelted dephosphorizer is getting the good preparation dephosphorization to put into well type furnace, in a certain temperature, time at roasting, and form the low melting point of compounds, immediately cooling, crushing to power, and it is ready to be used.) agent synchronization of such ore smelting process experiment research, explore the general rules for the Huimin iron ore. At the same time, explore a new path for the development and utilization of the high phosphorus iron ore. If these valuable mineral resources can be full utilized, that is not only to alleviate the shortage of the status, but also to recover the valuable precious metals, so it is importantly significant on the sustainable development of China’s iron and steel industry.The high phosphorus iron ore mixed premelted dephosphorizer agent melting reduction smelting experiment research take the oxygen top-blown melting reduction process. With the modern detection methods and analytical tools, such as X-ray. A systematic study to the influences of the premelted dephosphorization fixed agent, antioxidants oxidizer and flux ratio of the relationship, basicity,reduction temperature and C/O ratio, the time and oxygen concentration of oxygen for the influence of Huimin iron ore reduction process. With the theoretical calculation and the experimental data analysis, obtained the following conclusions:l)Through thermodynamic analysis, using oxygen top-blown smelting reduction smelting is theoretically feasible.2)Dephosphorization agent is fixed by antionxidant oxidizer and flux composition. When w(CaO):w(Fe2O3):w(CaF2)=45%:45%:10%, the effect of dephosphorization and the iron reconvery are the best. 3)The basicity to the molten iron has a significant effect. Along with the basicity from1.0to1.5. The quality of molten iron and dephosphorization rate first increased, then decreased. When the basicity was1.1, the dephosphorization rate was the highest. It is93.2%.4)The higher the temperature is, the more beneficial to the reduction of iron oxides, the iron recovery is higher. But the temperature is too high, can restrain the dephosphorization reaction. According to the experimental data, obtains the best temperature is1550℃.5)One of the advantages of oxygen top-blown melting reduction is high dephosphorization rate.Carbon as reducing agent, along with the C/O rate increases, the dephosphorziation rate decreases. At C/O=1.0, the iron recovery is the best,92.1%.6)Increase the oxygen time, oxygen concentration increases, increase oxygen concentration of oxygen to mass transfer. The experimental results showed that the oxygen time in10min. The iron recovery rate was gradually to increase. With the extension of time the oxygen dephosphorization rate increased, so the time is10min.Experimental research shows that:Using the well type of hybrid electric furnace melt the Huimin iron ore mixed premelted dephosphorizer in reduction smelting, when the dephosphorizer agent components is w(CaO):w(Fe2O3):w(CaF2)=45%:45%:10%, the temperature of1550℃, carbon oxygen ratio1.0, the basicity R=1.1, the oxygen time10min, oxygen flow rate250L/h, the components of smelted iron was:the phosphorus0.068%minimum smelting, the dephosphorization rate is93.2%, the iron reduction rate is90.1%, and the sulfur content is low. |
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