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Dechromization and dealumination kinetics in process of Na2CO3-roasting pretreatment of laterite ores
Alternative TitleTrans. Nonferrous Met. Soc. China
Guo, Qiang1,2; Qu, Jing-kui1,2; Han, Bing-bing1,2; Wei, Guang-ye1,2; Zhang, Pei-yu1,2; Qi, Tao1,2
2014-12-01
Source PublicationTRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
ISSN1003-6326
Volume24Issue:12Pages:3979-3986
AbstractA novel process was proposed for the activation pretreatment of limonitic laterite ores by Na2CO3 roasting. Dechromization and dealumination kinetics of the laterite ores and the effect of particle size, Na2CO3-ore mass ratio, and roasting temperature on Cr and Al extraction were studied. Experimental results indicate that the extraction rates of Cr and Al are up to 99% and 82%, respectively, under the optimal particle size of 44-74 mu m, Na2CO3-to-ore mass ratio of 0.6:1, and temperature of 1000 degrees C. Dechromization within the range of 600-800 degrees C is controlled by the diffusion through the product layer with an apparent activation energy of 3.9 kJ/mol, and that it is controlled by the chemical reaction at the surface within the range of 900-1100 degrees C with an apparent activation energy of 54.3 kJ/mol. Besides, the Avrami diffusion controlled model with on apparent activation energy of 16.4 kJ/mol is most applicable for dealumination. Furthermore, 96.8% Ni and 95.6% Co could be extracted from the alkali-roasting residues in the subsequent pressure acid leaching process.; A novel process was proposed for the activation pretreatment of limonitic laterite ores by Na2CO3 roasting. Dechromization and dealumination kinetics of the laterite ores and the effect of particle size, Na2CO3-ore mass ratio, and roasting temperature on Cr and Al extraction were studied. Experimental results indicate that the extraction rates of Cr and Al are up to 99% and 82%, respectively, under the optimal particle size of 44-74 mu m, Na2CO3-to-ore mass ratio of 0.6:1, and temperature of 1000 degrees C. Dechromization within the range of 600-800 degrees C is controlled by the diffusion through the product layer with an apparent activation energy of 3.9 kJ/mol, and that it is controlled by the chemical reaction at the surface within the range of 900-1100 degrees C with an apparent activation energy of 54.3 kJ/mol. Besides, the Avrami diffusion controlled model with on apparent activation energy of 16.4 kJ/mol is most applicable for dealumination. Furthermore, 96.8% Ni and 95.6% Co could be extracted from the alkali-roasting residues in the subsequent pressure acid leaching process.
KeywordDechromization Dealumination Kinetics Na2co3-roasting Pretreatment Laterite Ore Nickel Cobalt
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/S1003-6326(14)63559-7
URL查看原文
Indexed BySCI
Language英语
WOS KeywordNICKELIFEROUS LATERITES ; LIMONITIC LATERITE ; SULFURIC-ACID ; PRESSURE
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000347620300032
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/11736
Collection研究所(批量导入)
Affiliation1.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
Recommended Citation
GB/T 7714
Guo, Qiang,Qu, Jing-kui,Han, Bing-bing,et al. Dechromization and dealumination kinetics in process of Na2CO3-roasting pretreatment of laterite ores[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2014,24(12):3979-3986.
APA Guo, Qiang,Qu, Jing-kui,Han, Bing-bing,Wei, Guang-ye,Zhang, Pei-yu,&Qi, Tao.(2014).Dechromization and dealumination kinetics in process of Na2CO3-roasting pretreatment of laterite ores.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,24(12),3979-3986.
MLA Guo, Qiang,et al."Dechromization and dealumination kinetics in process of Na2CO3-roasting pretreatment of laterite ores".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 24.12(2014):3979-3986.
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