Research articles
ScienceAsia 50 (2024):ID 2024104 1-8 |doi:
10.2306/scienceasia1513-1874.2024.104
Effect of succinic acid on the crystal habit of
alpha-hemihydrate gypsum prepared from phosphogypsum:
Experimental and molecular dynamics simulation study
Wanqing Zhoua,b, Ruijie Qia, Dongmei Liua,b,*, Taiqi Huangc, Da Lic, Xia Yud
ABSTRACT: To efficiently select a reasonable amount of crystal habit modifier to improve the hydration matrix strength
of alpha-hemihydrate gypsum (?-HH), this study used phosphogypsum (PG) as the raw material to prepare ?-HH
using a semi-liquid phase method under high temperature and high pressure. The effects and mechanism of succinic
acid on the growth and development of ?-HH were investigated by experimental study and molecular dynamics
(MD) simulations. The results showed that succinic acid increases the formation time of ?-HH. The corresponding
bending/compressive strength was adjusted from 3.3/21.1 MPa to 7.0/50.0 MPa. The X-ray photoelectron spectrometer
(XPS) further confirmed this finding. The succinic acid carboxyl group reacted with Ca2+
ions, and the succinic acid
was adsorbed on the surface of ?-HH, inhibiting its axial growth, explaining this mechanism. The (002) face had the
largest surface energy (55.24 J/m2
) and roughness, fastest growth rate, and the available adsorption sites. The binding
energy of succinic acid to the (002) face was the largest at 0.15% concentration. The following sequence was obtained:
Eb
(0.15%)>Eb
(0.3%)>Eb
(0.10%)>Eb
(0.06%). Succinic acid significantly inhibited the axial growth of ?-HH, which
can reasonably explain the experimental results. This guided the preparation of ?-HH selective crystallizer with PG.
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| a |
College of Civil Engineering & Architecture, China Three Gorges University, Hubei 443002 China |
| b |
Hubei Key Laboratory of Disaster Prevention and Mitigation, Hubei 443002 China |
| c |
China Construction Third Engineering Bureau (Shenzhen) Co., Ltd., Guangdong 518000 China |
| d |
School of Architecture and Engineering, Guangxi Electromechanical Vocational and Technical College,
Guangxi 530000 China |
* Corresponding author, E-mail: 58983701@qq.com
Received 3 Feb 2024, Accepted 15 Sep 2024
|
