Experimental Study on One-Step Roasting of Bayan Obo Tailings

doi:10.12068/j.issn.1005-3026.2018.02.012

Abstract

Abstract: The roasting process of Bayan Obo tailings in C-Ca(OH)₂-NaOH was investigated by means of thermogravimetric and differential thermal analysis(TG-DTA)and X-ray diffraction(XRD). The influences of the roasting temperature， roasting time， coal content， Ca(OH)₂ dosage and NaOH dosage were explored on the decomposition of rare earth minerals and the reduction of hematite. The results showed that the hematite was reduced to magnetite(magnetic susceptibility: 2.37)and the rare earth minerals were decomposed by forming rare earth oxides(the leaching ratio of REO: 98.39%)under the optimal conditions. The optimal conditions were as follows: the roasting temperature of 650℃， the roasting time of 60min， the coal content of 2%， Ca(OH)₂ dosage of 4% and NaOH dosage of 2%.

Key words: Bayan Obo tailings, rare earth mineral, hematite, decomposition, roasting

CLC Number:

TF046.2

ZHENG Qiang， WU Wen-yuan， BIAN Xue. Experimental Study on One-Step Roasting of Bayan Obo Tailings[J]. Journal of Northeastern University Natural Science, 2018, 39(2): 205-210.

References

[1]陈泉源.包钢选矿厂稀土浮选尾矿选矿综合回收铁的研究［J］.矿产保护与利用，1997(1):49-52.(Chen Quan-yuan.Comprehensive recovery of iron from Baosteel rare earth flotation tailings ［J］.Conservation and Utilization of Mineral Resources，1997(1):49-52.)
[2]吕宪俊，陈丙辰.某尾矿中稀土的赋存状态及其综合回收研究［J］.矿产保护与利用，1998(4):22-24.(Lyu Xian-jun，Chen Bing-chen.Study on existing state and comprehensive recovery of rare earth element in a certain tailings ［J］.Conservation and Utilization of Mineral Resources，1998(4):22-24.)
[3]Yang H，Rong Y，Tang R，et al.Recovery of iron from Baotou rare earth tailings by magnetizing roast ［J］.Rare Metals，2013，32(6):616-621.
[4]林海，许晓芳，董颖博，等.深度还原-弱磁选回收稀土尾矿中铁的实验研究［J］.东北大学学报(自然科学版)，2013，34(7):1039-1044.(Lin Hai，Xu Xiao-fang，Dong Ying-bo，et al.Test research on recovery of iron from rare earth tailings by depth reduction roasting-low intensity magnetic separation ［J］. Journal of Northeastern University(Natural Science)，2013，34(7):1039-1044.)
[5]于秀兰，郎晓川，王之昌.MgO焙烧碳热氯化法提取包钢选矿厂尾矿中的稀土［J］.中国稀土学报，2009， 27(2):309-312.(Yu Xiu-lan，Lang Xiao-chuan，Wang Zhi-chang.Extraction of rare earths from Baotou concentrating mill’s tailing by MgO roasting and carbochlorination reaction ［J］.Journal of The Chinese Rare Earth Society，2009，27(2):309-312.)
[6]于秀兰，郎晓川，王之昌.从包钢选矿厂尾矿中回收稀土的工艺研究［J］.矿产综合利用，2009(4):38-40.(Yu Xiu-lan，Lang Xiao-chuan，Wang Zhi-chang.Technological research on recovery of rare-earths from concentractor’s tailings of Baotou Iron and Steel Company ［J］.Multipurpose Utilization of Mineral Resources，2009(4):38-40.)
[7]于秀兰，王之昌，韩跃新，等.碳热氯化法分解包钢选矿厂尾矿工艺的研究［J］.金属矿山，2007(9):113-115.(Yu Xiu-lan，Wang Zhi-chang，Han Yue-xin，et al.Study on process of decomposition of Baosteel concentrator tailing by carbothermic chlorination ［J］.Metal Mine，2007(9):113-115.)
[8]Gao P，Li Z H，Han Y X.Reaction behavior of associated rare earth minerals during coal-based reduction ［J］.Rare Metals，2014，33(5):628-632.
[9]Yuan S，Yang H，Xue X X，et al.Roasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere ［J］.Rare Metals，2017，36(9):764-768.
[10]Sun S C，Wu Z Y，Bian X，et al.Influence of NaCl-CaCl₂ on decomposing REPO₄ with CaO ［J］.Journal of Rare Earths，2007，25(6):779-782.
[11]Wu W Y，Bian X，Wu Z Y，et al.Reaction process of monazite and bastnaesite mixed rare earth minerals calcined by CaO-NaCl-CaCl₂ ［J］.Transactions of Nonferrous Metals Society of China，2007，17(4):864-868.

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