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Desilication of synthetic Bayer liquor with calcium sulfate dihydrate: Kinetics and modelling
Ma, Jiayu; Zhai, Kunming; Li, Zhibao; Li, ZB
2011-04-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume107Issue:1-2Pages:48-55
AbstractThe desilication kinetics of synthetic Bayer liquor by use of calcium sulfate dihydrate (CaSO4 center dot 2H(2)O) was studied experimentally and modelled mathematically. Temperature, initial silica concentration, and the dosage of CaSO4 center dot 2H(2)O were found to be the main factors affecting desilication reaction. CaSO4 center dot 2H(2)O was proved to remove up to 95% silica from sodium aluminate solution under the optimum operation conditions. A surface integration kinetic model, assuming that the desilication process follows a pseudo-second-order kinetics, was developed and successfully model the experiment data of desilication process via CaSO4 center dot 2H(2)O at the range of operating conditions investigated. An activation energy of 52 kJ/mol was estimated for the desilication process with CaSO4 center dot 2H(2)O over the temperature of 80-100 degrees C. The desilication reaction products (DSP) were analyzed by XRD and SEM, and found to be mainly Hauyne (3Na(2)O center dot 2CaSO(4)center dot 3Al(2)O(3)center dot 6SiO(2)) and Lazurite (3Na(2)O center dot CaSO4 center dot 0.5Na(2)SO(4)center dot 3Al(2)O(3)center dot 6SiO(2)). The final sulfate concentration in the liquor after desilication with CaSO4 center dot 2H(2)O was similar to 0.021 g/L. (C)0 2011 Elsevier B.V. All rights reserved.
KeywordDesilication Kinetics Modelling Calcium Sulfate Dihydrate Bayer Process Characterization
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2011.01.002
Indexed BySCI
Language英语
WOS KeywordALUMINATE SOLUTIONS ; DIGESTION CONDITIONS ; DIASPORIC BAUXITE ; CRYSTAL-GROWTH ; CANCRINITE ; SODALITE ; SILICA
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000289400800007
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5055
Collection湿法冶金清洁生产技术国家工程实验室
Corresponding AuthorLi, ZB
AffiliationChinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Ma, Jiayu,Zhai, Kunming,Li, Zhibao,et al. Desilication of synthetic Bayer liquor with calcium sulfate dihydrate: Kinetics and modelling[J]. HYDROMETALLURGY,2011,107(1-2):48-55.
APA Ma, Jiayu,Zhai, Kunming,Li, Zhibao,&Li, ZB.(2011).Desilication of synthetic Bayer liquor with calcium sulfate dihydrate: Kinetics and modelling.HYDROMETALLURGY,107(1-2),48-55.
MLA Ma, Jiayu,et al."Desilication of synthetic Bayer liquor with calcium sulfate dihydrate: Kinetics and modelling".HYDROMETALLURGY 107.1-2(2011):48-55.
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