焙烧温度及时间对白云鄂博铁矿选铁尾矿悬浮磁化焙烧的影响
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摘要
为了回收白云鄂博铁矿选铁尾矿中的铁矿物,采用强磁预富集—悬浮磁化焙烧—磁选工艺进行铁矿物再选试验。结果表明:TFe品位为14.10%的白云鄂博铁矿选铁尾矿经磁选预富集所得精矿在总气量600 mL/min、CO浓度15%、焙烧温度800℃、焙烧时间5 min条件下焙烧后,焙烧产品磨细至d90=39.29μm,在磁选管磁场强度为10.56 kA/m时,可获得TFe品位为63.88%、对原矿回收率为57.25%的磁选精矿。对试验各阶段产品分析表明,焙烧温度过高、焙烧时间过长会导致过还原,同时焙烧过程使得预富集精矿中表面光滑无裂纹的赤铁矿变为表面伴有微裂纹的磁铁矿。研究结果为多金属共(伴)生铁矿资源的高效利用提供了理论基础。
In order to recover iron ore from the tailings of Baiyun Obo Iron Mine,the high intensity magnetic separation preconcentration-suspension roasting-magnetic separation process was used to carry out the iron ore re-concentration test. The results show that the preconcentrated concentrate from tailings of Baiyun Obo Iron Mine with TFe grade of 14.10%,via the to?tal gas volume of preconcentrated concentrate is 600 mL/min,in which the CO concentration is 15%,the roasting tempera?ture is 800 ℃,and the roasting time is 5 min. After roasting,the particle size of the roasted product is d90=39.29 μm,and the magnetic field strength of the magnetic tube is 13.2 mT,the magnetic separation concentrate with TFe grade of 63.88% and to?tal iron recovery of 57.25% can be obtained. The product analysis of each stage in the test shows that too high roasting temper?ature and too long roasting time will lead to excessive reduction. Meanwhile,the roasting process makes the hematite without cracks in the surface of preconcentrated concentrate change into magnetite with micro-cracks on the surface. The study can provide technical basis for the development and utilization of polymetallic co-associated iron ore resources.
In order to recover iron ore from the tailings of Baiyun Obo Iron Mine,the high intensity magnetic separation preconcentration-suspension roasting-magnetic separation process was used to carry out the iron ore re-concentration test. The results show that the preconcentrated concentrate from tailings of Baiyun Obo Iron Mine with TFe grade of 14.10%,via the to?tal gas volume of preconcentrated concentrate is 600 mL/min,in which the CO concentration is 15%,the roasting tempera?ture is 800 ℃,and the roasting time is 5 min. After roasting,the particle size of the roasted product is d90=39.29 μm,and the magnetic field strength of the magnetic tube is 13.2 mT,the magnetic separation concentrate with TFe grade of 63.88% and to?tal iron recovery of 57.25% can be obtained. The product analysis of each stage in the test shows that too high roasting temper?ature and too long roasting time will lead to excessive reduction. Meanwhile,the roasting process makes the hematite without cracks in the surface of preconcentrated concentrate change into magnetite with micro-cracks on the surface. The study can provide technical basis for the development and utilization of polymetallic co-associated iron ore resources.
引文
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[11]韩跃新,高鹏,李艳军,等.我国铁矿资源“劣质能用、优质优用”发展战略研究[J].金属矿山,2016(12):2-8.Han Yuexin,Gao Peng,Li Yanjun,et al.Development strategies of available use of inferior quality and optimal use of high quality for domestic iron ore resources[J].Metal Mine,2016(12):2-8.
[12]Huang Xiang,Deng Hailin,Zheng Chunmiao,et al.Hydrogeochemical signatures and evolution of groundwater impacted by the Bayan Obo tailing pond in Northwest China[J].Science of the Total Environment,20164543-548.
[13]Zhang Bo,Liu Chengjun,Li Chunlong,et al.Separation and recovery of valuable metals from low-grade REE-Nb-Fe ore[J].International Journal of Mineral Processing,2016(10):89-94.
[14]Zheng Q,Bian X,Wu W.Iron recovery and rare earths enrichment from Bayan Obo tailings using coal-Ca(OH)2-NaOH roasting followed by magnetic separation[J].Journal of Iron and Steel Research(International),2017,24(2):147-155.
[15]Hayes P C,Grieveson P.Microstructural changes on the reduction of hematite to maanetite[J].Metallurgical Transactions B,1981,12(3):90-102.
[16]Swann P R,Tighe N J.High voltage microscopy of the reduction of hematite to magnetite[J].Metallurgical Transactions B,1977,8(2):67-74.
[2]余永富,陈泉源.白云鄂博铌选矿研究现状及展望[J].矿冶工程,1992(1):62-65.Yu Yongfu,Chen Quanyuan.Study on Bayan Obo niobium mineral processing:present state and respects[J].Mining and Metallurgical Engineering,1992(1):62-65.
[3]余永富.白云鄂博大型多金属共生矿选矿研究的回顾与展望[J].矿冶工程,1992(1):69-73.Yu Yongfu.Study on mineral processing of Bayan Obo multi-metallic ore deposit:retrospects and respects[J].Mining and Metallurgical Engineering,1992(1):69-73.
[4]许道刚,王建英,李保卫,等.白云鄂博矿中稀土、铁综合回收的新工艺研究[J].中国稀土学报,2015(5):633-640.Xu Daogang,Wang Jianying,Li Baowei,et al.A new procedure for comprehensive recovery of minerals containing rare earth and iron from Bayan Obo ores[J].Journal of the Chinese Society of Rare Earths,2015(5):633-640.
[5]张新民.白云鄂博矿综合回收稀土、铁、萤石选矿研究的探讨[J].矿产综合利用,1980(1):34-42.Zhang Xinmin.Discussion on mineral processing of comprehensive recovery of rare earth,iron and fluorite in Bayan Obo mine[J].Multipurpose Utilization of Mineral Resources,1980(1):34-42.
[6]徐淑香.从白云鄂博尾矿中综合回收铌的初步探索[J].矿产综合利用,1983(4):35-38.Xu Shuxiang.Preliminary exploration of comprehensive recovery of niobium from Bayan Obo tailings[J].Multipurpose Utilization of Mineral Resources,1983(4):35-38.
[7]郭财胜,李梅,柳召刚,等.白云鄂博稀土、铌资源综合利用现状及新思路[J].稀土,2014(1):96-100.Guo Caisheng,Li Mei,Liu Shaogang.The comprehensive utilization present situation and the new way of thinking of Bayan Obo,niobium rare earth resources[J].Chinese Rare Earths,2014(1):96-100.
[8]张鉴.白云鄂博共生矿选矿技术现状与展望[J].包钢科技,2005(4):1-5.Zhang Jian.Present situation and prospect of ore dressing technology in dealing with the Baiyunebo inter grown ores[J].Science&Technology of Baotou Steel,2005(4):1-5.
[9]姬志勇,刘亚峰.包钢白云鄂博主东矿磁铁矿新选厂工艺方案[J].金属矿山,2009(4):53-55.Ji Zhiyong,Liu Yafeng.Technical plan for the new Zhudongkuang magnetite concentrator of Bayan Obo Iron Mine,Bao stee[lJ].Metal Mine,2009(4):53-55.
[10]韩跃新,孙永升,李艳军,等.我国铁矿选矿技术最新进展[J].金属矿山,2015(2):1-11.Han Yuexin,Sun Yongsheng,Li Yanjun,et al.New development on mineral processing technology of iron ore resources in China[J].Metal Mine,2015(2):1-11.
[11]韩跃新,高鹏,李艳军,等.我国铁矿资源“劣质能用、优质优用”发展战略研究[J].金属矿山,2016(12):2-8.Han Yuexin,Gao Peng,Li Yanjun,et al.Development strategies of available use of inferior quality and optimal use of high quality for domestic iron ore resources[J].Metal Mine,2016(12):2-8.
[12]Huang Xiang,Deng Hailin,Zheng Chunmiao,et al.Hydrogeochemical signatures and evolution of groundwater impacted by the Bayan Obo tailing pond in Northwest China[J].Science of the Total Environment,20164543-548.
[13]Zhang Bo,Liu Chengjun,Li Chunlong,et al.Separation and recovery of valuable metals from low-grade REE-Nb-Fe ore[J].International Journal of Mineral Processing,2016(10):89-94.
[14]Zheng Q,Bian X,Wu W.Iron recovery and rare earths enrichment from Bayan Obo tailings using coal-Ca(OH)2-NaOH roasting followed by magnetic separation[J].Journal of Iron and Steel Research(International),2017,24(2):147-155.
[15]Hayes P C,Grieveson P.Microstructural changes on the reduction of hematite to maanetite[J].Metallurgical Transactions B,1981,12(3):90-102.
[16]Swann P R,Tighe N J.High voltage microscopy of the reduction of hematite to magnetite[J].Metallurgical Transactions B,1977,8(2):67-74.
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