高磷铁矿含碳团块直接还原-磁选提铁

采用直接还原?磁选工艺从湖南某地高磷铁矿含碳团块中提铁，研究了还原温度、还原时间、团块碱度、还原剂焦粉用量、添加剂Na2SO4用量和废塑料替代焦粉量等因素对磁选精矿指标的影响. 结果表明，在还原温度1150℃、还原时间40 min、团块碱度0.8、碳氧摩尔比0.9的条件下，添加4% Na2SO4同时添加废塑料替代25%焦粉，可得到金属化率为88.77%的焙烧矿，磁选后可得到铁品位91.99%、金属化率92.26%及P含量0.20%的金属铁粉，铁回收率达86.74%.

Recovery of Iron from Carbon Bearing Briquettes of High-phosphorus Iron Ore by Direct Reduction and Magnetic Separation

The reduction roasting?magnetic separation of iron from carbon bearing briquettes of high-phosphorus iron ores in Hunan was studied, and the effects of reducing temperature, reducing time, basicity, reducing agent, additive agent, and rate of waste plastics replace coke powders on the indexes of metallic iron powders were investigated. The results showed that under the experimental conditions of the basicity 0.8, the molar ratio of carbon/oxygen 0.9, the amount of sodium sulfate 4%, adding waste plastics to replace 25% coke powders, at 1150℃ for 40 min, the metallization rate of 88.77% of the roasted briquettes were obtained, and the final metallic iron powder assaying 91.99% TFe, metallization rate of 92.26% and P content of 0.20% of metal iron fines was obtained with the iron recovery rate of 86.74%.