Roasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere

IMR OpenIR

	Roasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere
其他题名	Roasting decomposition of mixed rare earth tailings by CaO in reducing atmosphere
	Yuan Shuai; Yang He; Xue XiangXin; Zhou Yan
	2017
发表期刊	RARE METALS
ISSN	1001-0521
卷号	36 期号:9 页码:764-768
摘要	In 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 %.
其他摘要	In 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 %.
关键词	CAO-NACL-CACL2 Mixed rare earth tailings Reducing roasting Leaching ratio
收录类别	CSCD
语种	英语
资助项目	[Development Program of National Key Basic Research]
CSCD记录号	CSCD:6084545
引用统计	被引频次：2[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/156030
专题	中国科学院金属研究所
作者单位	中国科学院金属研究所
推荐引用方式 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.