碳热还原法回收不锈钢尾渣中铁和铬的试验

 在理论分析的基础上，对国内某钢厂不锈钢尾渣进行高温碳热还原试验研究，研究了碳当量、碱度、反应温度和保温时间对铁、铬还原率的影响。结果表明，增加碳当量、降低碱度和提高反应温度均能提高铁、铬的还原率，铁的还原率最高可以达到93.29%，铬的还原率最高为76.49%。其中碳当量较低时，铁、铬的还原率均较低，随着碳当量的增加，在铁的还原率趋于稳定后，铬的还原率会大幅上升；碱度为1.4～1.2时，铁和铬的还原趋于平缓；当保温时间超过60 min后，延长时间并不能显著地提高铁、铬的还原率。

Carbothermic reduction for recycling of iron and chromium from stainless steel slag

The high temperature carbothermic reduction test of domestic stainless steel slag was conducted,reducing valuable metals. The effects of carbon equivalent,basicity,reaction temperature and thermal insulation time on the re-duction ratio of Fe and Cr were studied. Results show that the reduction ratio of Fe and Cr improved with the increase of carbon equivalent and reaction temperature and the reduction of basicity. The highest reduction ratio of Fe and Cr reached at 93.92% and 72.76%,respectively. The reduction ratio was low when the carbon equivalent was less,and with the increase of carbon equivalent,the reduction ratio of Cr raised sharply as the reduction ratio of Fe became stable. The reduction of Fe and Cr became less steep when the basicity ranged from 1.4 to 1.2. When the holding time was over 60 min,there was no significant effect on increasing the reduction ratio of Fe and Cr.