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Controlled Supersaturation Precipitation of Hydromagnesite for the MgCl2-Na2CO3 System at Elevated Temperatures: Chemical Modeling and Experiment
Cheng, Wenting; Li, Zhibao; Li, ZB
2010-02-17
Source PublicationINDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
ISSN0888-5885
Volume49Issue:4Pages:1964-1974
AbstractA new chemical model of supersaturation (S) was developed and applied to test for the precipitation of hydromagnesite [Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O] in the MgCl2-Na2CO3 system in supersaturated solutions over the temperature range of 50-90 degrees C. Based on the new model with the help of the OLI platform, the contour supersaturation of Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O has been exactly constructed by calculating the activity coefficients of species in unstable solutions. Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O crystals were identified using X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM) images. It was found that the crystal properties, such as morphology, particle size distribution, filtration, and sedimentation characteristics, can be optimized by controlling the supersaturation during precipitation. With the control of supersaturation, well-developed spherical-like Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O crystals can grow to an average size of 30-40 mu m, indicating a narrow particle size distribution, good filtration characteristics, and a high sedimentation rate. In addition, the Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O obtained was calcined to produce high-purity MgO at 800 degrees C. The size and morphology of MgO were similar to the same characteristics of the corresponding precursors.
KeywordBasic Magnesium Carbonate Aqueous-solutions Thermodynamic Properties Transport-properties Strong Electrolytes Cards Structure High-pressures Surface State House
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1021/ie9015073
Indexed BySCI
Language英语
WOS KeywordBASIC MAGNESIUM CARBONATE ; AQUEOUS-SOLUTIONS ; THERMODYNAMIC PROPERTIES ; TRANSPORT-PROPERTIES ; STRONG ELECTROLYTES ; CARDS STRUCTURE ; HIGH-PRESSURES ; SURFACE ; STATE ; HOUSE
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000274342500062
Citation statistics
Cited Times:29[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6210
Collection湿法冶金清洁生产技术国家工程实验室
Corresponding AuthorLi, ZB
AffiliationChinese Acad Sci, Key Lab Green Proc & Engn, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Cheng, Wenting,Li, Zhibao,Li, ZB. Controlled Supersaturation Precipitation of Hydromagnesite for the MgCl2-Na2CO3 System at Elevated Temperatures: Chemical Modeling and Experiment[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2010,49(4):1964-1974.
APA Cheng, Wenting,Li, Zhibao,&Li, ZB.(2010).Controlled Supersaturation Precipitation of Hydromagnesite for the MgCl2-Na2CO3 System at Elevated Temperatures: Chemical Modeling and Experiment.INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,49(4),1964-1974.
MLA Cheng, Wenting,et al."Controlled Supersaturation Precipitation of Hydromagnesite for the MgCl2-Na2CO3 System at Elevated Temperatures: Chemical Modeling and Experiment".INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 49.4(2010):1964-1974.
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