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Precipitation of nesquehonite from homogeneous supersaturated solutions
Cheng, Wenting; Li, Zhibao; Li, ZB
2009-09-01
Source PublicationCRYSTAL RESEARCH AND TECHNOLOGY
ISSN0232-1300
Volume44Issue:9Pages:937-947
AbstractThe homogeneous (unseeded) precipitation of nesquehonite (MgCO(3)center dot 3H(2)O) was studied over the temperature range of 10-40 degrees C. Precipitation was triggered by the supersaturation created by mixing MgCl(2) solution (0.5-1.5 M) with Na(2)CO(3) solution in the same concentration range. The Meissner's method was adopted in the calculation of supersaturations during the MgCl(2)-Na(2)CO(3) reaction to monitor the precipitation. Solids were identified using X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) images. In the temperature range of 10-40 degrees C, MgCO(3)center dot 3H(2)O with needle-like or gel-like morphology was precipitated. It was seen that the length, width and surface smoothness of the particles changed with reaction temperature and supersaturation. The supersaturation (S) was in the range of 1.09-58.68 during titration of Na(2)CO(3) solution. The dimension of the crystals increased with longer addition time (or lower initial concentration of reactant) at the same temperature. Slower addition via titration of 2 h followed by 2 h of equilibration at 40 degrees C proved successful in producing well developed needle-like MgCO(3)center dot 3H(2)O crystals of 30-50 mu m long and 3-6 mu m wide. MgCO(3)center dot 3H(2)O obtained were calcined to produce highly pure magnesium oxide (MgO) at 800 degrees C. The morphology of MgO was similar to that of their corresponding precursors. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
KeywordHomogeneous Precipitation Supersaturation Nesquehonite Magnesium Oxide
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/crat.200900286
Indexed BySCI
Language英语
WOS KeywordAQUEOUS-SOLUTIONS ; ACTIVITY-COEFFICIENTS ; MAGNESIUM CARBONATE ; STRONG ELECTROLYTES ; TEMPERATURE ; SYSTEM ; FABRICATION ; MORPHOLOGY ; SOLVENT ; SURFACE
WOS Research AreaCrystallography
WOS SubjectCrystallography
WOS IDWOS:000270109500006
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6590
Collection湿法冶金清洁生产技术国家工程实验室
Corresponding AuthorLi, ZB
AffiliationChinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Cheng, Wenting,Li, Zhibao,Li, ZB. Precipitation of nesquehonite from homogeneous supersaturated solutions[J]. CRYSTAL RESEARCH AND TECHNOLOGY,2009,44(9):937-947.
APA Cheng, Wenting,Li, Zhibao,&Li, ZB.(2009).Precipitation of nesquehonite from homogeneous supersaturated solutions.CRYSTAL RESEARCH AND TECHNOLOGY,44(9),937-947.
MLA Cheng, Wenting,et al."Precipitation of nesquehonite from homogeneous supersaturated solutions".CRYSTAL RESEARCH AND TECHNOLOGY 44.9(2009):937-947.
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