Influence of disodium hydrogen phosphate dodecahydrate on hydrothermal formation of hemihydrate calcium sulfate whiskers

被引:28
作者
Han, Qing [1 ,2 ]
Luo, Kangbi [1 ]
Li, Huping [1 ]
Xiang, Lan [2 ]
机构
[1] Kunming Univ Sci & Technol, Coll Chem Engn, Kunming 650500, Peoples R China
[2] Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China
来源
PARTICUOLOGY | 2014年 / 17卷
基金
美国国家科学基金会;
关键词
Calcium sulfate whiskers; Morphology control; Phosphorus; Hydrothermal technology; PHOSPHORIC-ACID PRODUCTION; SIMULATED CONDITIONS; CRYSTALLIZATION; GYPSUM; DIHYDRATE; CASO4;
D O I
10.1016/j.partic.2013.10.002
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The influence of Na2HPO4 center dot 12H(2)O on the hydrothermal formation of hemihydrate calcium sulfate (CaSO4-0.5H(2)O) whiskers from dihydrate calcium sulfate (CaSO4 center dot 2H(2)O) at 135 degrees C was investigated. Experimental results indicate that the addition of phosphorus accelerates the hydrothermal conversion of CaSO4 center dot 2H(2)O to CaSO4 center dot 0.5H(2)O via the formation of Ca-3(PO4)(2) and produces CaSO4 center dot 0.5H(2)O whiskers with thinner diameters and shorter lengths. Compared with the blank experiment without Na2HPO4 center dot 12H(2)O, the existence of minor amounts (8.65 x 10(-4)-4.36 x 10(-3) mol/L) of Na2HPO4 center dot 12H(2)O led to a decrease in the diameter of CaSO4 center dot 0.5H(2)O whiskers from 1.0-10.0 to 0.5-2.0 mu m and lengths from 70-300 to 50-200 mu m. (C) 2013 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:131 / 135
页数:5
相关论文
共 18 条
[1]   Crystallization of calcium sulfate dihydrate at different supersaturation ratios and different free sulfate concentrations [J].
Abdel-Aal, EA ;
Rashad, MM ;
El-Shall, H .
CRYSTAL RESEARCH AND TECHNOLOGY, 2004, 39 (04) :313-321
[2]   Effect of cetyl pyridinium chloride additive on crystallization of gypsum in phosphoric and sulfuric acids medium [J].
El-Shall, H ;
Rashad, MM ;
Abdel-Aal, EA .
CRYSTAL RESEARCH AND TECHNOLOGY, 2005, 40 (09) :860-866
[3]   Effect of phosphonate additive on crystallization of gypsum in phosphoric and sulfuric acid medium [J].
El-Shall, H ;
Rashad, MM ;
Abdel-Aal, EA .
CRYSTAL RESEARCH AND TECHNOLOGY, 2002, 37 (12) :1264-1273
[4]   Effect of surfactants on phosphogypsum crystallization and filtration during wet-process phosphoric acid production [J].
El-Shall, H ;
Abdel-Aal, EA ;
Moudgil, BM .
SEPARATION SCIENCE AND TECHNOLOGY, 2000, 35 (03) :395-410
[5]   Crystallization and phase stability of CaSO4 and CaSO4-based salts [J].
Freyer, D ;
Voigt, W .
MONATSHEFTE FUR CHEMIE, 2003, 134 (05) :693-719
[6]   TRANSFORMATIONS OF GYPSUM TO CALCIUM-SULFATE HEMIHYDRATE AND HEMIHYDRATE TO GYPSUM IN NACL SOLUTIONS [J].
IMAHASHI, M ;
MIYOSHI, T .
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 1994, 67 (07) :1961-1964
[7]   Influence of temperature and solution composition on the formation of calcium sulfates [J].
Luo, Kangbi ;
Li, Chunmei ;
Xiang, Lan ;
Li, Huping ;
Ning, Ping .
PARTICUOLOGY, 2010, 8 (03) :240-244
[8]   Crystal modification of calcium sulfate dihydrate in the presence of some surface-active agents [J].
Mahmoud, MHH ;
Rashad, MM ;
Ibrahim, IA ;
Abdel-Aal, EA .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2004, 270 (01) :99-105
[9]   Effect of citric acid and 1,2-dihydroxybenzene 3,5-disulfonic acid on crystallization of calcium sulfate dihydrate under simulated conditions of phosphoric acid production [J].
Rashad, MM ;
Mahmoud, MHH ;
Ibrahim, IA ;
Abdel-Aal, EA .
CRYSTAL RESEARCH AND TECHNOLOGY, 2005, 40 (08) :741-747
[10]   Crystallization of calcium sulfate dihydrate under simulated conditions of phosphoric acid production in the presence of aluminum and magnesium ions [J].
Rashad, MM ;
Mahmoud, MHH ;
Ibrahim, IA ;
Abdel-Aal, EA .
JOURNAL OF CRYSTAL GROWTH, 2004, 267 (1-2) :372-379