新疆某镜铁矿石磁化焙烧过程研究

金属矿山 ›› 2017, Vol. 46 ›› Issue (06): 75-79.

新疆某镜铁矿石磁化焙烧过程研究

马玉新¹，白丽梅¹，侯宇²，邓玉芬¹，刘淑贤¹

1.华北理工大学矿业工程学院，河北唐山 063009；2.万宝矿产有限公司，北京 100053

出版日期:2017-06-15 发布日期:2017-09-27

Study on Magnetic Roasting Process of Specularite Ore from Xinjiang

Ma Yuxin¹，Bai Limei¹，Hou Yu²，Deng Yufen¹，Liu Shuxian¹

1.School of Mining Engineering，North China University of Science and Technology，Tangshan 063009，China；2.Wanbao Mining Co.Ltd.，Beijing 100053，China

Online:2017-06-15 Published:2017-09-27

摘要/Abstract

摘要： 新疆某镜铁矿矿石TFe含量为35.20%，CaO含量为30.64%；铁矿物主要为镜铁矿，脉石矿物主要为方解石和石英。矿石中镜铁矿嵌布粒度微细，属于难选铁矿石。为考察矿石磁化焙烧过程物相转变规律，进行了焙烧温度、焙烧时间和配煤比对其磁化焙烧效果、铁物相转变过程的影响规律试验。结果表明：在配煤比为12%、焙烧温度为800 ℃、焙烧时间为75 min条件下还原焙烧后，焙烧产品磨细至-0.074 mm占90%，在磁场强度为120 kA/m条件下弱磁选，可获得铁品位为65.95%、回收率77.70%的指标。焙烧温度对镜铁矿磁化焙烧过程影响显著。焙烧温度低于800 ℃时镜铁矿磁化焙烧转变为Fe₃O₄，焙烧温度为800 ℃时，焙烧产品Fe₃O₄含量最高；焙烧温度高于800 ℃时，部分Fe₃O₄又被还原为FeO，产生过还原现象；焙烧温度为900 ℃时，焙烧产品FeO含量最高；焙烧温度达到1 000 ℃时部分FeO被还原成金属Fe。此过程与磁选结果的变化规律相符。另外，焙烧温度达到900 ℃时，部分Fe₂O₃与CaO反应，生成了2CaO·Fe₂O₃，不能通过弱磁选回收。试验结果为该镜铁矿资源的合理利用提供了技术参考。

关键词: 镜铁矿石, 磁化焙烧, 焙烧温度, 相转变

Abstract: There are 35.20% iron and 30.64% calcium oxide in specularite ore from Xinjiang.Iron mineral is mainly specularite，while gangue minerals are mainly calcite and quartz.The specularite is micro-fine disseminated in ore，and is a typical refractory iron ore.In order to study phase transformation of iron minerals during magnetic roasting process，effects of roasting temperature，roasting time and coal ratio on magnetic roasting results and phase transformation of iron minerals of specularite ore were investigated.The results indicated that iron concentrate with iron grade of 65.95%，recovery rate of 77.70% can be obtained under the conditions of coal powder with mass ratio of 12%，reduction temperature of 800 ℃ for 75 min，magnetic separation was brought at magnetic field intensity of 120kA /m after ground the roasted products at 90% passing 0.074 mm.Meanwhile，roasting temperature intense influences magnetic roasting process.When roasting temperature blew 800 ℃ Fe₂O₃，specularite can transform to Fe₃O₄ through magnetic roasting.The content of Fe₃O₄ is highest at roasting temperature of 800 ℃；when the roasting temperature is higher than 800 ℃，portion of Fe₃O₄ translated to FeO，and specularite is over-reduction.The content of FeO is highest under roasting temperature of 900 ℃；When roasting temperature rise to 1 000 ℃，portion of FeO will translated to metallic Fe.The process of phase transformation corresponds to results of magnetic separation.2CaO·Fe₂O₃ is produced at 900 ℃ resulted from portion of Fe₂O₃ reaction with CaO，which could not recovered by magnetic separation.The results can provide technical reserence for comprehensive utilization of specularite ore.

Key words: Specularite ore, Magnetic roasting, Roasting temperature, Phase transformation

马玉新, 白丽梅, 侯宇, 邓玉芬, 刘淑贤. 新疆某镜铁矿石磁化焙烧过程研究[J]. 金属矿山, 2017, 46(06): 75-79.

MA Yu-Xin, BAI Li-Mei, HOU Yu, DENG Yu-Fen, LIU Shu-Xian. Study on Magnetic Roasting Process of Specularite Ore from Xinjiang[J]. Metal Mine, 2017, 46(06): 75-79.

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