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Roasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere
Alternative TitleRoasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere
Yuan Shuai; Yang He; Xue XiangXin; Zhou Yan
2017
Source PublicationRARE METALS
ISSN1001-0521
Volume36Issue:9Pages:764-768
AbstractIn Baotou rare earth tailings ore, the grade of rare earth is close to that of the raw ore nearly. The rare earths are discarded in tailings dam caused by a serious waste of resources. First of all, the decomposition products of bastnaesite- and monazite-mixed rare earth tailings in CaO in reducing atmosphere were studied by means of X-ray diffraction (XRD). The results show that the normal products are CeO2, Ce2O3, Ca5F(PO4)(3), and Ce0.75Nd0.25O1.875, and there are no REPO4 and REFCO3. Secondly, the roasted product was extracted in HCl, and the relationship among roasting time, roasting temperature, CaO addition, and extraction temperature was studied by the quadratic regression-orthogonal analysis. Through analysis, the optimum process conditions of mixed rare earth tailings extracted are obtained as follows: roasting time of 60 min, roasting temperature of 800 A degrees C, CaO addition of 30 %, extraction temperature of 80 A degrees C, and extraction ratio of 99.18 %.
Other AbstractIn Baotou rare earth tailings ore, the grade of rare earth is close to that of the raw ore nearly. The rare earths are discarded in tailings dam caused by a serious waste of resources. First of all, the decomposition products of bastnaesite-and monazite-mixed rare earth tailings in CaO in reducing atmosphere were studied by means of X-ray diffraction (XRD). The results show that the normal products are CeO_2, Ce_2 O_3, Ca_5 F(PO_4)_3, and Ce_(0.75)Nd_(0.25)O_(1.875), and there are no REPO_4 and REFCO_3. Secondly, the roasted product was extracted in HCl, and the relationship among roasting time, roasting temperature, CaO addition, and extraction temperature was studied by the quadratic regression-orthogonal analysis. Through analysis, the optimum process conditions of mixed rare earth tailings extracted are obtained as follows: roasting time of 60 min, roasting temperature of 800 °C, CaO addition of 30 %, extraction temperature of 80 °C, and extraction ratio of 99.18 %.
KeywordCAO-NACL-CACL2 Mixed rare earth tailings Reducing roasting Leaching ratio
Indexed ByCSCD
Language英语
Funding Project[Development Program of National Key Basic Research]
CSCD IDCSCD:6084545
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/156030
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
Yuan Shuai,Yang He,Xue XiangXin,et al. Roasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere[J]. RARE METALS,2017,36(9):764-768.
APA Yuan Shuai,Yang He,Xue XiangXin,&Zhou Yan.(2017).Roasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere.RARE METALS,36(9),764-768.
MLA Yuan Shuai,et al."Roasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere".RARE METALS 36.9(2017):764-768.
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