Research On The Dephosphorization Component Optimization And Reuse Of The Dephosphorization Product Of High-phosphorus Hematite Iron Ore

How to develop and exploit high-phosphorus hematite ore has troubled Chinese and foreign scholars for many years, especially in face of the current situation of shortage of iron ore resources. Increasing research and develop efforts have become more important.Gasification dephosphorizing in the sintering is achieved by adding carbon,dephosphorization agent and optimizing parameters, so that the phosphorus can convert to stable gas and outer row smoothly, which can reduce the phosphorus contained in the iron ore.The assimilation temperature of high-phosphorus hematite ore and Australia and Japan pill powder are lower, and their ability to generate initial phase are strong. The order of ability to generate effective phase of the four iron ore fines is Australia and Japan pill powder, high-phosphorus hematite ore, South Africa powder and Brazil powder. But the effective liquid form termination temperature of high-phosphorus hematite ore is high, and it is difficult to generate sufficient liquid at low temperature.Fact Sage thermodynamic software simulation shows that increase temperature, Ar inert atmosphere and Cl₂ can conducive to gasification dephosphorization, but not CO reductive atmosphere and alkaline oxide. Phosphorus is reduced to form P₂ and P₄,gasification dephosphorization requires appropriate C and Si O2 contents. The order of affinity and capacity between phosphorus and alkaline oxide is Al₂O₃, Mg O and Ca O.In the high-temperature resistance furnace experiment, the dephosphorization effect of adding CaCl₂ is better than CaF₂ on the basis of the same SiO₂ and Na₂SO₄ contents. In pellet sintering tests, according to the ratio of the mass fraction Si O₂2.43%,Na₂SO₄1.56%, CaCl₂1.46% formulated the dephosphorization agent, and gasification dephosphorization rate reached 23.8% under the condition of carbon content 4%, reaction temperature 1250?, basicity 1.2, holding time 30 min, dephosphorization agent 6.8%.The recovery equipment is designed and chemistry experiment initially obtains POCl₃.