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Dechromization Kinetics of Limonitic Laterite Ores by Alkali-roasting Method Using Sodium Hydroxide
Guo, Q.; Qu, J. K.; Han, B. B.; Wei, G. Y.; Qi, T.
2011
Conference NameInternational Conference on Chemical Engineering and Advanced Materials
Source PublicationFUNDAMENTAL OF CHEMICAL ENGINEERING, PTS 1-3 丛书: Advanced Materials Research 卷: 233-235 页: 798-804
Pages798-804
Conference DateMAY 28-30, 2011
Conference PlaceChangsha, PEOPLES R CHINA
PublisherTrans Tech Publications Ltd
AbstractA novel process was proposed for the activation pretreatment of Cr-containing limonitic laterite ores by NaOH roasting. The dechromization kinetics of the laterite ores and the effect of particle size, NaOH-ore ratio, and roasting temperature on Cr extraction were studied in detail. Experimental results indicate that decreasing the particle size and increasing the NaOH-ore ratio and roasting temperature increase the Cr extraction rate. Approximately 96% Cr in the laterite ores could be extracted under the optimal alkali-roasting conditions. The results also indicate that the Avrami model is suitable for the dechromization process and that the apparent activation energy is calculated 11.12 kJ.mol(-1). The 99.5% Cr2O3 was obtained from Na(2)Cra(4) leached in the alkali solution by liquid-phase reduction and then calcining at high temperature.
KeywordActivation Pretreatment Alkali-roasting Cr-containing Limonitic Laterite Ores Dechromization Kinetics Pressure Acid Leaching Sodium Hydroxide Nickeliferous Laterites Sulfuric-acid Residue Recovery Pressure Behavior
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Indexed ByISTP
Language英语
Document Type会议论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/11390
Collection研究所(批量导入)
Recommended Citation
GB/T 7714
Guo, Q.,Qu, J. K.,Han, B. B.,et al. Dechromization Kinetics of Limonitic Laterite Ores by Alkali-roasting Method Using Sodium Hydroxide[C]:Trans Tech Publications Ltd,2011:798-804.
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