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Effect of CuCl 2 on hydrothermal crystallization of calcium sulfate whiskers prepared from FGD gypsum
Author(s) -
Wang Xiao,
Jin Biao,
Yang Liushuan,
Zhu Xinfeng
Publication year - 2015
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.201500035
Subject(s) - gypsum , whiskers , crystallization , hydrothermal circulation , hydrothermal synthesis , materials science , chemical engineering , flue gas desulfurization , whisker , transmission electron microscopy , phase (matter) , morphology (biology) , crystal (programming language) , mineralogy , calcium , sulfate , crystal growth , crystal structure , crystallography , chemistry , metallurgy , composite material , nanotechnology , organic chemistry , geology , paleontology , programming language , computer science , engineering
Using purified flue‐gas desulfurization (FGD) gypsum as raw material, effects of CuCl 2 on crystal morphology, phase structure, aspect ratio and crystallization of hydrothermal products prepared via hydrothermal crystallization in H 2 SO 4 ‐H 2 O solutions were investigated. The results show that dosage of CuCl 2 has a significant effect on the morphology, aspect ratio and crystallization of calcium sulfate whiskers (CSWs), but no effect on their phase transformation . At a dosage of 15 g CuCl 2 /kg FGD gypsum, the produced calcium sulfate whiskers had diameters ranging from 1 to 3 μm with average aspect ratio greater than 200 . Transmission electron diffraction patterns and highly magnified surface morphology of CSWs were found different from those of self‐assembly crystals. Compared to self‐assembly crystals, the produced CSWs showed a single crystal structure and their surface was very smooth.