Study on the Preparation Technology of Vanadium and Titanium Iron Concentrate Magnetic Pellets Containing Carbon and Boron

In this paper,the effects of boron-bearing iron concentrate content,roasting temperature and roasting time on the magnetization indexes of the carbon and boron bearing pellets were investigated by ternary and quadratic orthogonal regression and blank test. The results showed that the magnetic effect of V-Ti magnetite ore carbon-bearing pellets with a few boron-bearing iron concentrate content could be improved obviously. The influence of roasting temperature on the magnetic effect was most significantly,followed by the roasting time,and the interactions among of the three independent variable factors. According to the independent variable regression equation,under the condition of nitrogen protection,roasting temperature of 890~1 037 ℃,roasting time of 50~90 min and the boron-bearing iron concentrate content of 0.5%~3.0%,the magnetic pellets could be obtained,whose magnetization index was 0.67 and main phase was Fe₃O₄.