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An investigation on the kinetics of chromium dissolution from Philippine chromite ore at high oxygen pressure in KOH sub-molten salt solution
Chen, Gang1,2,3; Wang, Jiajun4; Wang Xiaohui1,2; Zheng, Shi-Li1,2; Du, Hao1,2; Zhang, Yi1,2
2013-07-01
Source PublicationHYDROMETALLURGY
Volume139Issue:0Pages:46-53
AbstractThe dissolution kinetics of chromite ore at high oxygen pressure in KOH sub-molten salt solution was systematically investigated in this work. The effects of KOH concentration, agitation speed, oxygen pressure, oxygen flow rate, particle size and leaching temperature on the chromium leaching rate were discussed in detail. The results indicate that the leaching rate is independent of agitation when the agitation speed is above 1100 rpm and is not sensitive to the oxygen flow rate. However, the leaching rate increases with the increment of temperature, oxygen partial pressure, as well as the decrease of particle size. The oxidization product remains as an "ash" layer during the leaching process. The kinetics study shows that the dissolution process is controlled by internal diffusion of the reactants. The determined activation energy is 44.31 kJ/mol and the reaction order with respect to the oxygen pressure is 0.68. Finally, a dissolution rate equation is derived to describe the process. (C) 2013 Elsevier B.V. All rights reserved.
KeywordChromite Ore Kinetics Oxygen Pressure Leaching Sub-molten Salt Oxidization
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
Language英语
WOS KeywordTEMPERATURE ; SOLUBILITY ; MINERALS ; OXIDE
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000326139000007
Citation statistics
Cited Times:31[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13416
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, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.China Univ Min & Technol Beijing, Sch Chem & Environm Engn, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Chen, Gang,Wang, Jiajun,Wang Xiaohui,et al. An investigation on the kinetics of chromium dissolution from Philippine chromite ore at high oxygen pressure in KOH sub-molten salt solution[J]. HYDROMETALLURGY,2013,139(0):46-53.
APA Chen, Gang,Wang, Jiajun,Wang Xiaohui,Zheng, Shi-Li,Du, Hao,&Zhang, Yi.(2013).An investigation on the kinetics of chromium dissolution from Philippine chromite ore at high oxygen pressure in KOH sub-molten salt solution.HYDROMETALLURGY,139(0),46-53.
MLA Chen, Gang,et al."An investigation on the kinetics of chromium dissolution from Philippine chromite ore at high oxygen pressure in KOH sub-molten salt solution".HYDROMETALLURGY 139.0(2013):46-53.
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