微波场下基于Na2CO3大剂量添加直接碳热法还原钛铁矿

提出一种基于直接碳热还原和微波加热的钛铁矿绿色高效利用新工艺.通过添加高剂量的Na2CO3加速还原反应的进行,并且Na2CO3可以循环利用.反应原料(钛铁矿+石墨+Na2CO3)在微波场下加热至1073～1123 K,保温20 min后,主要还原产物为Na2TiO3和金属铁,其中铁的金属化率可以达到92.67％～93....

Direct carbothermic reduction of ilmenite concentrates by adding high dosage of Na2CO3 in microwave field

A clean and efficient route for the utilization of ilmenite concentrates was proposed by direct carbothermic reduction in microwave field. High dosage of Na₂CO₃, which can be recycled, was added to accelerate the reduction reaction of ilmenite concentrates. After microwave heating in the temperature range of 1073?1123 K for 20 min, the main products were Na₂TiO₃ and metallic Fe with the metallization ratios being as high as 92.67%?93.21%. The reduction products were processed by water leaching, ball-milling in CO₂ atmosphere and magnetic separation in turn. The final products after magnetic separation were Fe-rich materials and Ti-rich materials (90.04 wt.% TiO₂), which can be used to produce iron and TiCl₄ or TiO₂. The optimized heating temperature was 1123 K in terms of metallization ratios, magnetic separation and caking property of the reduction products. Besides, the reduction mechanism of ilmenite concentrates with the addition of Na₂CO₃ in microwave field was also proposed.