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Influence of redox pretreatment on the pulverization of panzhihua ilmenite during hydrochloric acid leaching
Zhang, Jianbo1,2; Zhu, Qingshan1; Xie, Zhaohui1; Li, Hongzhong1
2015-10-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume157Issue:OCTPages:226-233
Abstract

The influence of oxidation-reduction (redox) pretreatment on the pulverization of Panzhihua ilmenite during hydrochloric acid leaching to obtain synthetic rutile was investigated in detail. We observed the dissociation of incompact TiO2 products formed via the dissolution-hydrolysis of Ti ions, which was caused by the fast dissolution of FeTiO3 during the leaching process and was the fundamental reason for pulverization for the raw Panzhihua ilmenite. A stirring operation during the acid leaching aggravated the pulverization phenomenon. The formation and consumption of insoluble rutile grains during the redox pretreatment played a key role in preventing the pulverization of pre-treated ilmenites. The rutile network formed during the pre-oxidation was retained and served as a nucleus for the hydrolyzed product during the successive leaching process, providing the leaching products of the pre-oxidized ilmenite with less hydrolyzed TiO2, higher mechanical strength, and thus an excellent resistance to pulverization, even with stirred leaching. Because the following weak reduction process (reduction of ferric iron to ferrous state) at relatively low temperatures (e.g., 873 K) did not destroy the rutile network that was formed by the pre-oxidation, it did not change the ability of the pre-oxidation to prevent the pulverization of ilmenite. However, the weak reduction process at high temperatures (e.g. 1023 K) weakened the effect of pre-oxidation because most of the futile grains that were formed by the pre-oxidation were consumed and formed FeTiO3. (C) 2015 Elsevier B.V. All rights reserved.

KeywordRutile Ilmenite Hydrochloric Acid Leaching Pulverization Oxidation Reduction
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2015.08.019
Indexed BySCI
Language英语
WOS KeywordMORPHOLOGICAL-CHANGES ; KINETICS ; RUTILE
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China(21325628)
WOS IDWOS:000364252700032
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19845
Collection多相复杂系统国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Ansteel Res Inst Vanadium & Titanium Iron & Steel, State Key Lab Vanadium & Titanium Resources Compr, Panzhihua 617000, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Jianbo,Zhu, Qingshan,Xie, Zhaohui,et al. Influence of redox pretreatment on the pulverization of panzhihua ilmenite during hydrochloric acid leaching[J]. HYDROMETALLURGY,2015,157(OCT):226-233.
APA Zhang, Jianbo,Zhu, Qingshan,Xie, Zhaohui,&Li, Hongzhong.(2015).Influence of redox pretreatment on the pulverization of panzhihua ilmenite during hydrochloric acid leaching.HYDROMETALLURGY,157(OCT),226-233.
MLA Zhang, Jianbo,et al."Influence of redox pretreatment on the pulverization of panzhihua ilmenite during hydrochloric acid leaching".HYDROMETALLURGY 157.OCT(2015):226-233.
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