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Accelerated phase transition and synthesis of magnesite from hydromagnesite in aqueous mono-ethylene glycol solution
Zhang, Xiaojuan1,3; Zeng, Yan2; Li, Zhibao1
2021-06-01
Source PublicationJOURNAL OF CRYSTAL GROWTH
ISSN0022-0248
Volume563Pages:10
Abstract

Magnesite was successfully synthesized from hydromagnesite by undergoing a phase transition process in monoethylene glycol (MEG) solution. The process can be achieved at 393 K under 0.5 MPa of CO2 in 5 h, and the formed particle size of magnesite ranges from 1 to 10 mu m depending on the synthesis temperature. This study discloses the effect of MEG concentration with adequate amount of sodium chloride (NaCl) or sodium carbonate (Na2CO3) on the magnesite synthesis process, both of which accelerates the mass transfer rate of CO2 during the transition process. The mixed-solvent electrolyte (MSE) model was applied by constructing the phase diagram of hydromagnesite -magnesite in the Mg-Na-Cl-CO3-CO2-MEG-H2O system. Both the experimental and the calculated results unveiled that the addition of MEG reduces the water activity significantly, which allowed for the phase transition to occur. Additionally, rhombic magnesite can be obtained from hydromagnesite in an aqueous solution at a condition that contains 95 wt% of MEG, 1 mol/kgw. NaCl and 0.285 mol/kgw. of Na2CO3.

KeywordMagnesite Hydromagnesite Phase Transition Mono-ethylene Glycol Water Activity Phase Diagram
DOI10.1016/j.jcrysgro.2021.126105
Language英语
Funding ProjectNational Natural Science Foundation of China[21978290] ; National Natural Science Foundation of China[21776279]
WOS Research AreaCrystallography ; Materials Science ; Physics
WOS SubjectCrystallography ; Materials Science, Multidisciplinary ; Physics, Applied
Funding OrganizationNational Natural Science Foundation of China
WOS IDWOS:000637749200013
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/48419
Collection中国科学院过程工程研究所
Corresponding AuthorLi, Zhibao
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.McGill Univ, Mat Engn, 3610 Rue Univ, Montreal, PQ H3A 0C5, Canada
3.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Xiaojuan,Zeng, Yan,Li, Zhibao. Accelerated phase transition and synthesis of magnesite from hydromagnesite in aqueous mono-ethylene glycol solution[J]. JOURNAL OF CRYSTAL GROWTH,2021,563:10.
APA Zhang, Xiaojuan,Zeng, Yan,&Li, Zhibao.(2021).Accelerated phase transition and synthesis of magnesite from hydromagnesite in aqueous mono-ethylene glycol solution.JOURNAL OF CRYSTAL GROWTH,563,10.
MLA Zhang, Xiaojuan,et al."Accelerated phase transition and synthesis of magnesite from hydromagnesite in aqueous mono-ethylene glycol solution".JOURNAL OF CRYSTAL GROWTH 563(2021):10.
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