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Crystallization and Agglomeration Kinetics of Hydromagnesite in the Reactive System MgCl2-Na2CO3-NaOH-H2O
Alternative TitleInd. Eng. Chem. Res.
Wang, Junfeng; Li, Zhibao
2012-06-13
Source PublicationINDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
ISSN0888-5885
Volume51Issue:23Pages:7874-7883
AbstractThe reactive crystallization kinetics of hydromagnesite (4MgCO(3)center dot Mg(OH)(2)center dot 4H(2)O) for the MgCl2-Na2CO3-NaOH-H2O system has been systematically investigated in a continuously operated mixed-suspension mixed-product removal (MSMPR) crystallizer for the first time. Determination of the effects of reactive temperature and OH- ion on magnesium carbonate hydrates in the above system was conducted through a batch crystallization experiment, and the crystallization temperature of 80 degrees C for the precipitation of regular spherical-like hydromagnesite was selected for the kinetics study. The relative supersaturation for hydromagnesite is obtained based on the activity coefficients calculated by the Pitzer model. The growth rate, nucleation rate, and agglomeration kernel are determined on the basis of the agglomeration population balance equation, and their kinetic equations are then correlated in terms of power law kinetic expressions. The orders of volume growth rate and linear growth rate with respect to the relative supersaturation are 1.55 and 0.95, respectively. The magma density has an important effect on the nucleation rate of hydromagnesite particles. However, the expression of beta alpha M-T(-0.39) for hydromagnesite agglomeration shows that the magma density has a negative effect on the agglomeration kernel. All of these will provide a basis for the design and analysis of industrial crystallizers.; The reactive crystallization kinetics of hydromagnesite (4MgCO(3)center dot Mg(OH)(2)center dot 4H(2)O) for the MgCl2-Na2CO3-NaOH-H2O system has been systematically investigated in a continuously operated mixed-suspension mixed-product removal (MSMPR) crystallizer for the first time. Determination of the effects of reactive temperature and OH- ion on magnesium carbonate hydrates in the above system was conducted through a batch crystallization experiment, and the crystallization temperature of 80 degrees C for the precipitation of regular spherical-like hydromagnesite was selected for the kinetics study. The relative supersaturation for hydromagnesite is obtained based on the activity coefficients calculated by the Pitzer model. The growth rate, nucleation rate, and agglomeration kernel are determined on the basis of the agglomeration population balance equation, and their kinetic equations are then correlated in terms of power law kinetic expressions. The orders of volume growth rate and linear growth rate with respect to the relative supersaturation are 1.55 and 0.95, respectively. The magma density has an important effect on the nucleation rate of hydromagnesite particles. However, the expression of beta alpha M-T(-0.39) for hydromagnesite agglomeration shows that the magma density has a negative effect on the agglomeration kernel. All of these will provide a basis for the design and analysis of industrial crystallizers.
KeywordChemical-equilibrium Model Natural-waters Na-k-mg-ca-h-cl-so4-oh-hco3-co3-co2-h2o System Mineral Solubilities Temperatures Nucleation Prediction
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1021/ie300213C
URL查看原文
Indexed BySCI
Language英语
WOS KeywordCHEMICAL-EQUILIBRIUM MODEL ; NATURAL-WATERS ; NA-K-MG-CA-H-CL-SO4-OH-HCO3-CO3-CO2-H2O SYSTEM ; MINERAL SOLUBILITIES ; TEMPERATURES ; NUCLEATION ; PREDICTION
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000305111700005
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6293
Collection研究所(批量导入)
AffiliationChinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Wang, Junfeng,Li, Zhibao. Crystallization and Agglomeration Kinetics of Hydromagnesite in the Reactive System MgCl2-Na2CO3-NaOH-H2O[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2012,51(23):7874-7883.
APA Wang, Junfeng,&Li, Zhibao.(2012).Crystallization and Agglomeration Kinetics of Hydromagnesite in the Reactive System MgCl2-Na2CO3-NaOH-H2O.INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,51(23),7874-7883.
MLA Wang, Junfeng,et al."Crystallization and Agglomeration Kinetics of Hydromagnesite in the Reactive System MgCl2-Na2CO3-NaOH-H2O".INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 51.23(2012):7874-7883.
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