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Thermodynamic and kinetic studies of the MgCl2-NH4Cl-NH3-H2O system for the production of high purity MgO from calcined low-grade magnesite
Wang, Junfeng1; Li, Zhibao1; Park, Ah-Hyung Alissa2,3; Petit, Camille4
2015-06-01
Source PublicationAICHE JOURNAL
ISSN0001-1541
Volume61Issue:6Pages:1933-1946
Abstract

To improve the overall sustainability of MgO-based refractory production, a novel process to produce high purity MgO from calcined low-grade magnesite in ammonium chloride solution was developed. The process was designed on the basis of the phase equilibria of the NH4Cl-MgCl2-NH3-H2O system obtained using the Mixed Solvent Electrolyte model embedded in OLI software. The optimum calcination temperature of low-grade magnesite was determined to be 650 degrees C in terms of the conversion ratio of magnesium and calcium in the leaching experiments. An apparent activation energy of Mg extraction was 30.98 kJ/mol, which is slightly lower than that of Ca leaching. An empirical kinetic model of magnesium extraction was also developed to describe the effects of NH4Cl concentration, particle size of calcined magnesite, and solid-to-liquid ratio on the extent of extraction of magnesium. At leaching time of 10 min, the leachate with high Mg/Ca molar ratio was obtained. Then, MgO with a purity of 99.09% was produced through the decomposition of intermediate 4MgCO(3)Mg(OH)(2)4H(2)O. (c) 2015 American Institute of Chemical Engineers AIChE J, 61: 1933-1946, 2015

KeywordKinetic Thermodynamic Solid-liquid Reaction Low-grade Magnesite Ammonium Chloride
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1002/aic.14789
Indexed BySCI
Language英语
WOS KeywordCITRIC-ACID SOLUTIONS ; DISSOLUTION KINETICS ; NATURAL MAGNESITE ; AMMONIUM-CHLORIDE ; LEACHING KINETICS ; GAS ; TEMPERATURES ; PRESSURES ; OXIDE ; MODEL
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000355141100013
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19253
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Chinese Acad Sci, Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100190, Peoples R China
2.Columbia Univ, Lenfest Ctr Sustainable Energy, Dept Earth & Environm Engn, New York, NY 10027 USA
3.Columbia Univ, Lenfest Ctr Sustainable Energy, Dept Chem Engn, New York, NY 10027 USA
4.Univ London Imperial Coll Sci Technol & Med, Dept Chem Engn, London SW7 2AZ, England
Recommended Citation
GB/T 7714
Wang, Junfeng,Li, Zhibao,Park, Ah-Hyung Alissa,et al. Thermodynamic and kinetic studies of the MgCl2-NH4Cl-NH3-H2O system for the production of high purity MgO from calcined low-grade magnesite[J]. AICHE JOURNAL,2015,61(6):1933-1946.
APA Wang, Junfeng,Li, Zhibao,Park, Ah-Hyung Alissa,&Petit, Camille.(2015).Thermodynamic and kinetic studies of the MgCl2-NH4Cl-NH3-H2O system for the production of high purity MgO from calcined low-grade magnesite.AICHE JOURNAL,61(6),1933-1946.
MLA Wang, Junfeng,et al."Thermodynamic and kinetic studies of the MgCl2-NH4Cl-NH3-H2O system for the production of high purity MgO from calcined low-grade magnesite".AICHE JOURNAL 61.6(2015):1933-1946.
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