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Chemical and morphological transformation of ilmenite during modification roasting with chlorine in fluidized bed
Mao, Hancheng1,2; Fan, Chuanlin1,2; Du, Guangchao1,2; Zhu, Qingshan1,2
2021-05-01
Source PublicationJOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
ISSN2238-7854
Volume12Pages:2285-2297
AbstractThe modification roasting of ilmenite with gaseous chlorine in fluidized bed at 650 degrees C -750 degrees C was conducted, prior to hydrochloric leaching for preparation of synthetic rutile. The modification effects were characterized by redox titration, X-ray diffraction, scanning electron microscopy and X-ray fluorescence spectroscopy analysis. During the modified roasting, one third of reacted ferrous iron in ilmenite was chlorinated to form gaseous FeCl3 while the remaining part was oxidized to ferric state. The oxidation rate was found quite fast which was controlled by chemical reaction mechanism. At 650 degrees C, Fe2Ti3O9 crystallographic shear phase was the major solid product of roasting, as temperature rose, rutile and hematite phases became the main products. Morphologically, the Fe2Ti3O9 product caused no effect on the morphology of oxidized ilmenite, as gaseous FeCl3 generated and volatilized, submicron cracks were extended in the particles. When roasting at 750 degrees C, rutile phase emerged and nucleated quickly throughout the particles, and the formed rutile grains became the skeleton while volatilization removal of FeCl3, the roasted ilmenite kept their stability and formed target phase with porous structure. Besides, the silicate gangue of mineral was modified from smooth glass morphology to porous structure with more than 50% of calcium in silicate rapidly chloridized. After hydrochloric leaching, the acquired synthetic rutile from modified ilmenite reached a grade of 85.26 wt.% TiO2, and the harmful MgO and CaO contents were reduced to 0.55 wt.% and 0.19 wt.% respectively. The new process of chlorine modification-hydrochloric leaching shows a great applied prospect for synthetic rutile from low-grade ilmenite. (C) 2021 The Authors. Published by Elsevier B.V.
KeywordIlmenite Modification with chlorine Micromorphology transition Impurity removal
DOI10.1016/j.jmrt.2021.04.024
Language英语
WOS KeywordSELECTIVE CHLORINATION ; ISOTHERMAL OXIDATION ; PANZHIHUA ILMENITE ; KINETICS ; MECHANISM ; RUTILE ; PHASE ; ALPHA-PBO2 ; HEMATITE ; MIXTURES
Funding ProjectNational Natural Science Foundation of China[51774262] ; National Natural Science Foundation of China[22078342] ; National Natural Science Foundation of China[21736010] ; National Key Research and Development Project of China[2020YFC1909701]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Project of China
WOS IDWOS:000654636200008
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/48976
Collection中国科学院过程工程研究所
Corresponding AuthorFan, Chuanlin; Zhu, Qingshan
Affiliation1.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Mao, Hancheng,Fan, Chuanlin,Du, Guangchao,et al. Chemical and morphological transformation of ilmenite during modification roasting with chlorine in fluidized bed[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2021,12:2285-2297.
APA Mao, Hancheng,Fan, Chuanlin,Du, Guangchao,&Zhu, Qingshan.(2021).Chemical and morphological transformation of ilmenite during modification roasting with chlorine in fluidized bed.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,12,2285-2297.
MLA Mao, Hancheng,et al."Chemical and morphological transformation of ilmenite during modification roasting with chlorine in fluidized bed".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 12(2021):2285-2297.
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