Research on Smelting-separation for Metallized Pellets of Vanadium-titanium Magnetite

The smelting-separation process for metallized pellets of vanadium-titanium magnetite was studied in the lab.The ternary phase diagram of slag was calculated under various basicity by using Factsage software and the influences of smelting temperature,smelting time and the basicity of the metallized pellet on the results of slag-iron separation,iron recovery ratio and the quality of biggest nugget were investigated.The results demonstrate that increasing smelting temperature at an appropriate extent can improve the iron recovery ratio and is beneficial for slag-iron separation.With the increase of the basicity of the metallized pellet,the iron recovery ratio increases firstly and then descends.The iron recovery ratio increases with the rise of smelting time,but the iron recovery ratio slightly reduces after 40 min.The optimal conditions are 1 550 ℃,R = 1. 0,40 min. Under this conditions,the iron recovery ratio reaches 93. 17% and the quality of biggest nugget reaches 24.16 g with very good slag-iron separation.