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Three‐phase hydration of magnesium oxide using hydration agents
Author(s) -
Tang Xiaojia,
Ji Yangyuan,
Nie Yixing,
Guo Lin,
Liu Quan,
Zhao Jiao,
Li Tie,
Zhu Yimin
Publication year - 2017
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201600393
Subject(s) - magnesium , thermogravimetric analysis , chemistry , crystallite , scanning electron microscope , hydration reaction , acetic acid , phase (matter) , inorganic chemistry , hydrate , oxide , magnesium acetate , chemical engineering , materials science , crystallography , organic chemistry , cement , metallurgy , engineering , composite material
A gas‐liquid‐solid reaction system, named three‐phase reaction system, was firstly used for magnesium oxide (MgO) hydration in our previous research. In this paper, the effect of hydration agents on the MgO hydration in three‐phase reaction system was investigated experimentally. The hydration agents included magnesium acetate, acetic acid, and ammonium chloride. The variations of hydration degree (measured by thermogravimetric analysis), pH value, conductivity of different reaction system were studied. Furthermore, the final hydrated samples were characterized by X‐ray power diffraction (XRD), Scanning electron microscopy (SEM) and nitrogen sorption analyses. The results indicated that the hydration degree was 20%∼30% higher in hydration agent solution than that in deionized water. Hexagonal plate crystal was obtained in all reaction systems, while lager diameter and thinner crystallite was formed in the acetate system. The degree of hydration and the SEM analysis results indicated that the peel‐off phenomenon was more obvious in the present of CH 3 COO − .