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Decomposition of chromite ore by oxygen in molten NaOH-NaNO3
Zhang, Yang1,2; Zheng, Shi-li1; Xu, Hong-bin1; Du, Hao1; Zhang, Yi1; Zheng, SL
2010-07-01
Source PublicationINTERNATIONAL JOURNAL OF MINERAL PROCESSING
ISSN0301-7516
Volume95Issue:1-4Pages:10-17
AbstractAn optimized process production of chromate by oxygen was proposed. The tests are executed by introducing NaNO3 to the decomposition process of chromite ore in molten NaOH to decrease the decomposition temperature. An interesting result is that the reaction temperature could decrease from above 500 degrees C to about 400 degrees C, and sodium nitrate has no consumption in the oxidation process, while the Cr yield is above 99%. Mechanism analysis shows that chromite ore is firstly oxidized by NaNO3, where NaNO2 is generated as a reduction product, and then is oxidized to NaNO3. NaNO3 plays the role of oxygen carrier, which can reduce the mass transfer resistance of oxygen. The kinetic study shows that the decomposition process was an internal diffusion controlled, with an apparent activation energy of 106 kJ/mol. Effects of liquid-to-ore ratio, chromite ore particle size, and reaction temperature on the decomposition of chromite ore were also studied. (C) 2010 Elsevier B.V. All rights reserved.
KeywordChromite Sodium Hydroxide Sodium Nitrate Sodium Nitrite Oxidation
SubtypeArticle
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
DOI10.1016/j.minpro.2010.03.005
Indexed BySCI
Language英语
WOS KeywordMANUFACTURING PROCESS ; POTASSIUM HYDROXIDE ; SODIUM CHROMATE ; SALTS
WOS Research AreaEngineering ; Mineralogy ; Mining & Mineral Processing
WOS SubjectEngineering, Chemical ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000279623500002
Citation statistics
Cited Times:41[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6124
Collection湿法冶金清洁生产技术国家工程实验室
Corresponding AuthorZheng, SL
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Yang,Zheng, Shi-li,Xu, Hong-bin,et al. Decomposition of chromite ore by oxygen in molten NaOH-NaNO3[J]. INTERNATIONAL JOURNAL OF MINERAL PROCESSING,2010,95(1-4):10-17.
APA Zhang, Yang,Zheng, Shi-li,Xu, Hong-bin,Du, Hao,Zhang, Yi,&Zheng, SL.(2010).Decomposition of chromite ore by oxygen in molten NaOH-NaNO3.INTERNATIONAL JOURNAL OF MINERAL PROCESSING,95(1-4),10-17.
MLA Zhang, Yang,et al."Decomposition of chromite ore by oxygen in molten NaOH-NaNO3".INTERNATIONAL JOURNAL OF MINERAL PROCESSING 95.1-4(2010):10-17.
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