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Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite
Alternative TitleParticuology
Zhu, Qingshan1; Zhang, Jianbo1,2; Li, Hongzhong1
2014-06-01
Source PublicationPARTICUOLOGY
ISSN1674-2001
Volume14Issue:3Pages:83-90
AbstractThe present study investigated the influence of high temperature oxidation and reduction pretreatments on the leaching rate of Panzhihua ilmenite. The as-pretreated ilmenite was leached with 20% HCl at 105 degrees C. The leaching process was controlled by the phases and microstructures that evolved during the pretreatment processes. The leaching kinetics of pure hematite, ilmenite and pseudobrookite were characterized to clarify the phase effect on the iron-leaching rate; the rate of iron leaching occurs in the following order in the HCl solution: hematite (ferric iron) > ilmenite (ferrous iron) >> pseudobrookite (ferric iron). Therefore, the often-cited notion that ferrous iron dissolves faster in HCl solutions than ferric iron when explaining the pretreatment effects is inaccurate. Moreover, the oxidation pretreatment (at 600-1000 degrees C for 4h) cannot destroy the dense structure of the Panzhihua ilmenite. Therefore, the influence exerted by the oxidation on the leaching process is primarily determined by the phase change; oxidation at 600 and 700 degrees C slightly increased the rate of iron leaching because the ilmenite was transformed into hematite, while the oxidation at 900-1000 degrees C significantly reduced the rate of iron leaching because a pseudobrookite phase formed. The reduction effect was subsequently investigated; the as-oxidized ilmenite was reduced under H-2 at 750 degrees C for 30 min. The reduction significantly accelerated the rate of subsequent iron leaching such that nearly all of the iron had dissolved after leaching for 2 h in 20% HCl at 105 degrees C. This enhanced iron-leaching rate is mainly attributed to the cracks and holes that formed during the reduction process. (C) 2013 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.; The present study investigated the influence of high temperature oxidation and reduction pretreatments on the leaching rate of Panzhihua ilmenite. The as-pretreated ilmenite was leached with 20% HCl at 105 degrees C. The leaching process was controlled by the phases and microstructures that evolved during the pretreatment processes. The leaching kinetics of pure hematite, ilmenite and pseudobrookite were characterized to clarify the phase effect on the iron-leaching rate; the rate of iron leaching occurs in the following order in the HCl solution: hematite (ferric iron) > ilmenite (ferrous iron) >> pseudobrookite (ferric iron). Therefore, the often-cited notion that ferrous iron dissolves faster in HCl solutions than ferric iron when explaining the pretreatment effects is inaccurate. Moreover, the oxidation pretreatment (at 600-1000 degrees C for 4h) cannot destroy the dense structure of the Panzhihua ilmenite. Therefore, the influence exerted by the oxidation on the leaching process is primarily determined by the phase change; oxidation at 600 and 700 degrees C slightly increased the rate of iron leaching because the ilmenite was transformed into hematite, while the oxidation at 900-1000 degrees C significantly reduced the rate of iron leaching because a pseudobrookite phase formed. The reduction effect was subsequently investigated; the as-oxidized ilmenite was reduced under H-2 at 750 degrees C for 30 min. The reduction significantly accelerated the rate of subsequent iron leaching such that nearly all of the iron had dissolved after leaching for 2 h in 20% HCl at 105 degrees C. This enhanced iron-leaching rate is mainly attributed to the cracks and holes that formed during the reduction process. (C) 2013 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
KeywordIlmenite Oxidation Reduction Hydrochloric Acid Leaching
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.partic.2013.08.002
URL查看原文
Indexed BySCI
Language英语
WOS KeywordROSETTA ILMENITE ; SYNTHETIC RUTILE ; REDUCTION ; ORE ; KINETICS
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Chemical ; Materials Science, Multidisciplinary
WOS IDWOS:000338609600013
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Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11061
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhu, Qingshan,Zhang, Jianbo,Li, Hongzhong. Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite[J]. PARTICUOLOGY,2014,14(3):83-90.
APA Zhu, Qingshan,Zhang, Jianbo,&Li, Hongzhong.(2014).Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite.PARTICUOLOGY,14(3),83-90.
MLA Zhu, Qingshan,et al."Influence of phase and microstructure on the rate of hydrochloric acid leaching in pretreated Panzhihua ilmenite".PARTICUOLOGY 14.3(2014):83-90.
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