Effects of ammonium citrate on crystallization of α-CaSO4•0.5H2O in hydrothermal synthesis processes

被引：0

作者：

Sun X.-B. ^{[1
]}

Zhang N. ^{[1
]}

Dou Y. ^{[1
]}

Fang Y. ^{[1
]}

Zheng Z.-Y. ^{[2
]}

Liu R. ^{[2
]}

Cui P. ^{[1
]}

机构：

[1] School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei

[2] Anhui Liuguo Limited Liability Company, Tongling

来源：

Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2019年 / 33卷 / 01期

关键词：

Ammonium citrate; Crystal-growing controlling agent; Crystallization; Α-CaSO[!sub]4[!/sub]•0.5H[!sub]2[!/sub]O;

D O I：

10.3969/j.issn.1003-9015.2019.01.012

中图分类号：

学科分类号：

摘要：

α-CaSO4•0.5H2O was prepared using CaSO4•2H2O as a raw material and ammonium citrate (C6H17N3O7) as an additive under conditions of hydrothermal temperature 130 ℃, stirring rate 60 r•min-1 and reaction time 2 h. The morphology and structure of α-CaSO4•0.5H2O crystals were characterized by XRD, SEM, TEM, TG, DSC, FT-IR and XPS. Effects of C6H17N3O7 concentrations on crystallization of α-CaSO4•0.5H2O were discussed. The results show that C6H17N3O7 inhibits α-CaSO4•0.5H2O growth along the c-axis. With the increase of C6H17N3O7 concentration, the morphology of α-CaSO4•0.5H2O changes from acicular to columnar, the diameter of crystal increases from 1.5~2 μm to 10~12 μm and its aspect ratio reduces from 80:1~100:1 to 2:1~3:1. C6H17N3O7 prolongs induction time and phase transformation period, slows down growth rate and improves thermal stability of the crystal during CaSO4•2H2O to α-CaSO4•0.5H2O conversion. © 2019, Editorial Board of Journal of Chemical Engineering of Chinese Universities". All right reserved."

引用

页码：96 / 102

页数：6

共 23 条

[1] Jia C.Y., Chen Q.S., Zhou X., Et al., Trace NaCl and Na2EDTA mediated synthesis of α-calcium sulfate hemihydrate in glycerol-water solution, Industrial & Engineering Chemistry Research, 55, 34, pp. 9189-9194, (2016)
[2] Doadrio J.C., Arcos Dcabanas M.V., Vallet R.M., Et al., Calcium sulphate-based cements containing cephalexin, Biomaterials, 25, 13, pp. 2629-2635, (2004)
[3] Wang P., Lee E.J., Park C.S., Et al., Calcium sulfate hemihydrate powders with a controlled morphology for use as bone cement, Journal of the American Ceramic Society, 91, 6, pp. 2039-2042, (2008)
[4] Kong B., Guan B.H., Yang L.C., Et al., Influence of seed crystal and modifier on the morphology of α-calcium sulfate hemihydrate prepared by salt solution method in pilot scale, Advanced Materials Research, 16, 70, pp. 8-12, (2010)
[5] Guan B.H., Jiang G.M., Fu H.L., Et al., Thermodynamic preparation window of alpha calcium sulfate hemihydrate from calcium sulfate dihydrate in non-electrolyte glycerol-water solution under mild conditions, Industrial & Engineering Chemistry Research, 50, 23, pp. 13561-13567, (2011)
[6] Fu H.L., Guan B.H., Jiang G.M., Et al., Effect of supersaturation on competitive nucleation of caso4 phases in a concentrated cacl2 solution, Crystal Growth & Design, 12, 3, pp. 1388-1394, (2017)
[7] Guan B.H., Shen Z.X., Wu Z.B., Et al., Effect of pH on the preparation of α-calcium sulfate hemihydrate from FGD gypsum with the hydrothermal method, Journal of the American Ceramic Society, 91, 12, pp. 383-3840, (2008)
[8] Chen Q.S., Jia C.Y., Li Y., Et al., α-calcium sulfate hemihydrate nanorods synthesis: a method for nanoparticle preparation by mesocrystallization, Langmuir, 33, 9, pp. 2362-2369, (2017)
[9] Tang Y.B., Gao J.M., Investigation of the effects of sodium dicarboxylates on the crystal habit of calcium sulfate α-hemihydrate, Langmuir, 33, 38, pp. 9637-9644, (2017)
[10] Chen Q.S., Jiang G.M., Jia C.Y., Et al., A facile method to control the structure and morphology of α-calcium sulfate hemihydrate, Crystengcomm, 17, 44, pp. 8549-8554, (2015)

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