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中文摘要: 以铁品位35.59%的山东某地的铜渣和山东、甘肃两地的四种高炉灰为原料，进行共还原—磁选回收铁工艺试验，研究了高炉灰作为共还原—磁选工艺还原剂的可行性。结果表明，焙烧体系中仅加入高炉灰时，铜渣与高炉灰共还原—磁选所得还原铁指标均较差；当加入氟化钙时，还原铁中铁品位和铁回收率均大于90%，指标较好，实现了铜渣与高炉灰中铁资源的高效回收。高炉灰种类及用量、氟化钙用量、还原温度、还原时间及磨选条件均对还原铁指标有影响，在铜渣︰G1︰氟化钙质量比为100︰30︰15、共还原温度1 250 ℃、共还原时间60 min的条件下焙烧，然后在磨矿细度-74 μm占51.87%、磁场强度80 kA/m条件下磁选，可获得铁品位和铁回收率分别为92.06%和92.65%的直接还原铁。该工艺可以为铜渣和高炉灰的综合利用提供参考。
Abstract:The feasibility to recover metal iron from copper slag and blast furnace ash by co-reduction followed by magnetic separation using blast furnace ash as reducing agent was verified. The process of recovering iron by co-reduction and magnetic separation was studied applying copper slag from Shandong with iron grade of 35.59% and four kinds of blast furnace ash from Shandong and Gansu province as raw materials. The results show that indexes of the direct reduced iron (DRI) are poor when blast furnace ash is only added into roasting system, while with the presence of CaF2, co-reduction followed by magnetic separation can make full use of reducibility of carbon in blast furnace ash and realize the recovery of iron resources in copper slag and blast furnace ash, and both the iron grade and iron recovery of reduced iron are more than 90%. Reducing agent type and dosage, CaF2 dosage, co-reduction temperature, co-reduction time, grinding fineness and magnetic field intensity has effects on indexes of DRI. DRI with Fe grade of 92.06% and Fe recovery of 92.65% is obtained under the conditions including roasting temperature of 1 250 ℃, roasting time of 60 min, mass ratio of G1 and CaF2 of 30% and 15%, respectively, grinding fineness of roasting product of -74 μm of 51.87%, and magnetic field intensity of 80 kA/m. This process can provide a reference for comprehensive utilization of copper slag and blast furnace ash.
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GAO En-xia,WANG Ning,JIANG Man,CUI Shi-yan,LI Chuan-wei,YAN Ping-ke.Recovery of Iron from Copper Slag and Blast Furnace Ash by Co-reduction and Magnetic Separation[J].Nonferrous Metals (Extractive Metallurgy),2022(2):27-33.