为解决钒钛磁铁矿难还原的问题,以钒钛磁铁矿粉为原料,以葡萄糖为碳源,采用水热炭化法对钒钛磁铁矿粉进行碳包覆,研究微波加热下碳包覆对矿粉还原的影响.结果表明,钒钛磁铁矿粉在1 100 ℃下还原产物成分为Fe,碳包覆钒钛磁铁矿粉在900 ℃下还原产物成分仅为Fe,微波加热下碳包覆可以降低钒钛磁铁矿粉的还原温度;在700～900 ℃下还原时,碳包覆钒钛磁铁矿粉还原产物金属化率大于钒钛磁铁矿粉,微波加热下碳包覆可以提高钒钛磁铁矿粉还原产物金属化率;钒钛磁铁矿粉还原产物表面有大量铁晶须,碳包覆钒钛磁铁矿粉还原产物表面光滑,微波加热下碳包覆可减少钒钛磁铁矿粉还原过程中铁晶须的产生;钒钛磁铁矿粉最佳还原条件为碳包覆后在900 ℃下微波还原2 h.
Study on reduction behavior of vanadium titanium magnetite powder enhanced by microwave-carbon coating
In order to solve the problem of difficult reduction of vanadium titanium magnetite,vanadium titani-um magnetite powder was used as raw material and glucose was used as carbon source,and the hydrothermal carbonization method was used to carbon coat the vanadium titanium magnetite powder.The effect of carbon coating on the reduction of mineral powder under microwave heating was studied.The results show that the component of the reduction product of vanadium-titanium magnetite powder at 1 100 ℃ is Fe,and the compo-nent of the reduction product of carbon-coated vanadium-titanium magnetite powder at 900 ℃ is only Fe.Car-bon coating under microwave heating can reduce the reduction temperature of vanadium titanium magnetite pow-der.When reduced at 700～900 ℃,the metallization rate of the reduction product of carbon-coated vanadium ti-tanium magnetite powder is greater than that of vanadium titanium magnetite powder.Carbon coating under mi-crowave heating can improve the metallization rate of the reduction product of vanadium titanium magnetite powder.There are a large number of iron whiskers on the surface of the reduction product of vanadium-titanium magnetite powder.The surface of the reduction product of carbon-coated vanadium-titanium magnetite powder is smooth.Carbon coating under microwave heating can reduce the generation of iron whiskers during the reduc-tion process of vanadium-titanium magnetite powder.The optimal reduction condition of vanadium-titanium magnetite powder is carbon coating and microwave reduction at 900 ℃ for 2 h.
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