Sintering Characteristics Of High-phosphorus Iron Ore And Transformation Mechanism Of Phosphorus

To reduce the cost of iron and steel smelting, the sintering characteristics of high-phosphorus iron ore and sintered dephosphorization process was studied, their variationhas been mastered. By analysis the existing forms of phosphorus before and aftersintering, it’s transformation in sintering mechanism has been learned. The conclusion issummarized as follows:1) The results of sinter pot experiments, which were added some high-phosphorusiron ore, show that: with the increase of high-phosphorus iron ore, sinter reduction anddrum strength increase, the yield and RDI+3.15firstly increase and then decrease.2) The sintered dephosphorization results show that: before liquid phase appears inlarge numbers, increase carbon content, elevated temperature, reduce alkalinity, extendholding time, select a appropriate material thickness and small-ball sintering process, thedephosphorization rates will increase.3) By improving the sintering process, the dephosphorization rate is up to13.29%.The lower dephosphorization rate is relationship with the sintering atmosphere which ismacro-oxide partial-reduction.4) During the sintering process, Ca5(PO4)3F, in the participation of SiO2, is reducedby C and generates P2; the P2vapor, during the escape process, is oxidized to P2O5gasand emissions. When the alkalinity>1, part of the P2O5and CaO reaction, to generatephosphate and stay in the sinter; alkalinity<1, SiF4gas, generated in the reaction, iscontribute to P2O5vapor escape.5) The sintered dephosphorization process is simple, and it can reduce the cost ofroasting and secondary grinding. The P2O5vapor soluble in water easily， and producephosphoric acid, therefore, the sintering exhaust is filtered by water, phosphorus can berecycled and the environment will improve.