钒钛磁铁精矿球团还原性研究

Study on Reducibility of V-Ti Bearing Magnetite Concentrate Pellet

通过钒钛磁铁精矿—煤—Na_2CO_3球团的加热试验,考察了温度、配碳量、Na_2CO_3配加量等因素对矿还原性的影响,探讨了Na_2CO_3的作用机理。采用回归正交法设计试验,统计分析试验结果发现:温度、配碳量、Na_2CO_3配加量对矿还原有显著的影响,其中温度影响最大;较低温度下,Na_2CO_3对碳气化反应能产生明显的正催化作用,促进矿中铁氧化物的还原。在配碳2.33 mol、1 260℃、Na_2CO_3配加0.014mol、30min的条件下,钒钛磁铁精矿的还原度为94.56%,金属化率91.67%,金属铁颗粒明显生成。

The effects of temperature, dosage of carbon and Na2 CO3 on reduction of V-Ti bearing magnetite concentrate pellet were investigated by heating test of concentrate-coal-Na2CO3 mixed pellets. The influence mechanism of Na2 CO3 on reduction of concentrate was discussed. The results show that temperature, carbon amount and Na2 CO3 amount as additive have great effect on reduction degree and metallization of concentrate, with temperature exerting the most significant effect. Na2 CO3 can produce obvious catalytic effect on carbon gasification reaction at low temperature, promoting reduction of iron oxide in concentrate. Reducibility and metallization rate of concentrate is 94.56% and 91.67% respectively, and metallic iron particles are apparently evident under the conditions including carbon amount of 2.33 mol, Na2CO3 amount of 0. 014 mol, temperature of 1 260 ℃,and time of 30 min.