高磷铁矿气化脱磷理论及试验研究

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

以高磷铁矿为研究对象,从氧势图、热力学计算、气化脱磷优势区图角度分析了气化脱磷的可行性,采用微型烧结试验研究了不同配碳量、添加剂配比对气化脱磷率的影响。理论分析表明,磷氧化物氧势线高于铁氧化物氧势线,难于还原,原料中加入碳后,碳颗粒周围存在局部的还原性,可以实现原料中磷的还原,加入添加剂,可以把原料中磷转化为含磷气体。试验研究表明,配碳量过低和过高均不利于脱磷,当配碳量为4%,按照一定配比加入Si O2+Ca Cl2后,气化脱磷率达到17%左右。

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 Si O2+Ca Cl2 is added at a certain ratio.