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Pressure oxidative leaching of Indian chromite ore in concentrated NaOH solution
Alternative TitleHydrometallurgy
Zhang, Hai1,2,3; Xu, Hong-bin1,2; Zhang, Xiaofei1,2; Zhang, Yang1,2; Zhang, Yi1,2
2014-02-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume142Issue:1Pages:47-55
AbstractA novel process for leaching chromite ore has been proposed. Compared to the traditional alkaline roasting process, the new hydrometallurgical process lowers effectively the reaction temperature and enhances the leaching efficiency through pressure oxidative leaching with pure oxygen (O-2) in concentrated sodium hydroxide (NaOH) aqueous solution. The chromium (Cr) leaching efficiency reaches 99% with ore particle size of 40 to 50 pm, Na0H-to-ore mass ratio of 4:1, NaOH concentration of 60 wt.%, O-2 partial pressure of 3.2 MPa, and reaction temperature of 250 degrees C. By investigating the dependence of the Cr leaching efficiency on NaOH concentration, O-2 partial pressure, and reaction temperature, the macrokinetics can be described by the shrinking core model under control diffusion through the solid product layer with apparent activation energy of 54.6 kj/mol. It was also found that during the leaching process, the alkaline insoluble iron (Fe) and magnesium (Mg) in the chromite ore remain in the residue in the form of magnesium hydroxide (Mg(OH)(2)) and magnesium ferrite (MgFe2O4) while the divalent Fe is oxidized to trivalent Fe. Furthermore, in the initial stage of the leaching process, silicon (Si) is leached faster than aluminum (Al) and their concentrations in the aqueous solution increase rapidly with reaction time. However, as the leaching proceeds further, the Si concentration in the aqueous solution drops a little and then stays constant. (C) 2013 Elsevier B.V. All rights reserved.; A novel process for leaching chromite ore has been proposed. Compared to the traditional alkaline roasting process, the new hydrometallurgical process lowers effectively the reaction temperature and enhances the leaching efficiency through pressure oxidative leaching with pure oxygen (O-2) in concentrated sodium hydroxide (NaOH) aqueous solution. The chromium (Cr) leaching efficiency reaches 99% with ore particle size of 40 to 50 pm, Na0H-to-ore mass ratio of 4:1, NaOH concentration of 60 wt.%, O-2 partial pressure of 3.2 MPa, and reaction temperature of 250 degrees C. By investigating the dependence of the Cr leaching efficiency on NaOH concentration, O-2 partial pressure, and reaction temperature, the macrokinetics can be described by the shrinking core model under control diffusion through the solid product layer with apparent activation energy of 54.6 kj/mol. It was also found that during the leaching process, the alkaline insoluble iron (Fe) and magnesium (Mg) in the chromite ore remain in the residue in the form of magnesium hydroxide (Mg(OH)(2)) and magnesium ferrite (MgFe2O4) while the divalent Fe is oxidized to trivalent Fe. Furthermore, in the initial stage of the leaching process, silicon (Si) is leached faster than aluminum (Al) and their concentrations in the aqueous solution increase rapidly with reaction time. However, as the leaching proceeds further, the Si concentration in the aqueous solution drops a little and then stays constant. (C) 2013 Elsevier B.V. All rights reserved.
KeywordChromite Ore Pressure Leaching Sodium Hydroxide Kinetics Oxygen
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2013.10.016
URL查看原文
Indexed BySCI
Language英语
WOS KeywordCHROMATE
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000331688200005
Citation statistics
Cited Times:36[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/8177
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Hai,Xu, Hong-bin,Zhang, Xiaofei,et al. Pressure oxidative leaching of Indian chromite ore in concentrated NaOH solution[J]. HYDROMETALLURGY,2014,142(1):47-55.
APA Zhang, Hai,Xu, Hong-bin,Zhang, Xiaofei,Zhang, Yang,&Zhang, Yi.(2014).Pressure oxidative leaching of Indian chromite ore in concentrated NaOH solution.HYDROMETALLURGY,142(1),47-55.
MLA Zhang, Hai,et al."Pressure oxidative leaching of Indian chromite ore in concentrated NaOH solution".HYDROMETALLURGY 142.1(2014):47-55.
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