微波碳热还原攀枝花低品位钛精矿

来源期刊：钢铁钒钛2010年第4期

论文作者：雷鹰 李雨 彭金辉 张利波 张世敏 郭胜惠

文章页码：1 - 6

关键词：微波； 攀枝花低品位钛精矿； 碳热还原； 热应力

Key words：microwave； Panzhihua low-grade titanium concentrate； carbothermal reduction； thermal stress

摘    要：对攀枝花低品位钛精矿进行了微波还原试验研究。研究了预氧化、配碳量、添加剂等条件对还原钛铁矿中铁金属化率的影响。试验结果表明:在预氧化温度800℃、硼砂配比3%、焦粉配比10%、微波还原温度1000~1100℃条件下,还原60min,还原产物铁的金属化率超过90%。分析微波强化钛铁矿还原的机理在于:微波热应力在球团内部产生大量孔隙和裂纹促进了还原气氛的扩散,快速还原产生的大量铁晶核加速了还原反应。

Abstract: Cabothermic reduction of Panzhihua low-grade ilmenite by microwave heating was studied in this work.The effects of preoxidation,coke ratio,additives on Fe metallization of reduced titanium concentrate were investigated.The experiment results show that under the optimum conditions of preoxidation temperature 800℃ by conventional heating,proportioning ratio of Na₂B₄O₇3% and coke ratio 10%,reduction temperature range 1 000~1 100℃,reduction time 60 min,the Fe metallization of the reduced product exceeds 90%.The reinforce mechanisms of microwave during reduction of titanium concentrate were deduced as follow: the crackle and porosity distribute inside ilmenite pellets induced by thermal stress originated from microwave selective heating can promote the spread of reducing atmosphere,and the large number of iron nuclei caused by quickly reduction can accelerate the reduction of ferriferous oxide.