转底炉处理赤泥工艺技术

为了综合利用氧化铝冶炼产生的赤泥，探索在转底炉中直接还原赤泥、磨矿磁选获得高品位直接还原铁。通过实验室试验摸索了转底炉还原工艺参数，并在转底炉工业试验线进行了工业试验。实验室结果表明，赤泥还原后的直接还原铁(DRI)金属化率可达88.6%，磁选后的铁品位可达82.1%，磁选后的铁回收率可达88.9%。工业试验中，转底炉还原后，产品金属化率平均为69.2%，将还原后的DRI磁选获得高品位的DRI产品，磁选后DRI的铁品位为72.8%，磁选后铁回收率达到了85.2%,初步打通了在转底炉中还原赤泥、磁选的工艺路径。

Technology for red mud treated in rotary hearth furnace process

For utilizing red mud produced by alumina smelting process, the direct reduction of red mud in rotary hearth furnace and grinding magnetic separation to obtain high grade direct reduction iron were explored. The process parameters of rotary hearth furnace reduction were explored through laboratory experiments, and industrial experiments were conducted on the industrial test line of hearth furnace. Laboratory results showed that metallization of DRI after red mud reduction was about 88.6%, and after magnetic separation, the iron grade was about 82.1%, and the iron recovery was about 88.9%. In industrial experiments, the average metallization rate of the product was about 69.2% after reduction in the hearth furnace. After magnetic separation, DRI products with high grade were obtained, the iron grade and iron recovery of DRI production were about 72.8% and 85.2%, respectively. The technological route of reducing red mud and magnetic separation in the hearth furnace has been preliminarily investigated.