Theoretical and Experimental Study on Gasification Dephosphorization in High-phosphorus Iron Ore

Taking high phosphorus iron ore as the research object. the feasibility of gasification dephosphorization is analyzed theoretically from the views of oxygen potential diagram,thermodynamics and advantage area map,and the influence of different carbon content and additive ratio on the rate of gasification dephosphorization was studied by mini sintering test.Theoretical analysis shows that the oxygen potential line of the phosphorus oxide is higher than iron oxide and the phosphorus oxide is difficult to be reduced.When carbon is added into the raw material,there is a partial reduction in the surrounding carbon particles,and thus P can be reduced.After adding the additive,the phosphorus in the raw material is converted into phosphorus gas,so as to achieve the purpose of dephosphorization. The experimental results show that the too low or high carbon content is not conducive to dephosphorization.The rate of dephosphorization is about 17% when the carbon content is 4% and SiO₂+CaCl₂ is added at a certain ratio.