Efficient separation of vanadium, titanium, and iron from vanadium-bearing titanomagnetite by pressurized pyrolysis of ammonium chloride-acid leaching-solvent extraction process

doi:10.1016/j.seppur.2020.117169

	Efficient separation of vanadium, titanium, and iron from vanadium-bearing titanomagnetite by pressurized pyrolysis of ammonium chloride-acid leaching-solvent extraction process
	Bian, Zhenzhong 1; Feng, Yali 1; Li, Haoran 2; Wu, Hao 1
刊名	SEPARATION AND PURIFICATION TECHNOLOGY
	2021-01-15
卷号	255 页码:10
关键词	Vanadium-bearing titanomagnetite Pressurized pyrolysis Ammonium chloride Solvent extraction Valuable metals
ISSN号	1383-5866
DOI	10.1016/j.seppur.2020.117169
英文摘要	A novel process featuring pressurized pyrolysis of ammonium chloride-acid leaching-solvent extraction was carried out to separate vanadium, titanium, and iron from vanadium-bearing titanomagnetite (VBT). Then vanadium and iron existed in the form of ammonium polyvanadate ((NH4)(2)V6O16) and ammonium jarosite (NH4Fe3(SO4)(2)(OH)(6)) after precipitation from the water phase and the raffinate, while titanium remained in the acid leaching tailings. When pyrolysis temperature of 320 degrees C, pyrolysis time of 2 h, and the mass ratio of NH4Cl to slag of 1.5 followed by leaching in 61.7 g/L HCl solution, the extraction rates of vanadium, titanium, and iron reached 95.1%, 1.2%, and 92.5%, respectively. The analysis through XRD and SEM-EDS proves that the main phases of the roasted sample were attributed to FeCl2 and FeCl3, indicating pressurized pyrolysis of ammonium chloride could promote the capture of more vanadium by generated ferric/ferrous chloride in situ. The concentration of vanadium and iron was enriched to 17.8 g/L and 10.6 g/L through the N-235 solvent extraction-Na2SO4 washing-Na2CO3 stripping processes, which could produce V2O5 with a purity of 99.93% by roasting (NH4)(2)V6O16 and ammonium jarosite with excellent crystal faces. Additionally, the TiO2 concentration reached 184.2 g/L using 80 wt% sulfuric acid for the acid leaching residue, which could be used as the raw material to production of TiO2 pigment. Moreover, the mechanism of the reaction of NH4Cl with valuable metal in the closed environment has been systematically studied.
资助项目	China Ocean Mineral Resources R D Association[DY135B215] ; Major Science and Technology Program for Water Pollution Control and Treatment[2015ZX07205003] ; National Natural Science Foundation of China[21176242] ; National Natural Science Foundation of China[21176026]
WOS研究方向	Engineering
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000633045800007
资助机构	China Ocean Mineral Resources R D Association ; Major Science and Technology Program for Water Pollution Control and Treatment ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/48138]
专题	中国科学院过程工程研究所
通讯作者	Feng, Yali
作者单位	1.Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Bian, Zhenzhong,Feng, Yali,Li, Haoran,et al. Efficient separation of vanadium, titanium, and iron from vanadium-bearing titanomagnetite by pressurized pyrolysis of ammonium chloride-acid leaching-solvent extraction process[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2021,255:10.
APA	Bian, Zhenzhong,Feng, Yali,Li, Haoran,&Wu, Hao.(2021).Efficient separation of vanadium, titanium, and iron from vanadium-bearing titanomagnetite by pressurized pyrolysis of ammonium chloride-acid leaching-solvent extraction process.SEPARATION AND PURIFICATION TECHNOLOGY,255,10.
MLA	Bian, Zhenzhong,et al."Efficient separation of vanadium, titanium, and iron from vanadium-bearing titanomagnetite by pressurized pyrolysis of ammonium chloride-acid leaching-solvent extraction process".SEPARATION AND PURIFICATION TECHNOLOGY 255(2021):10.