α-calcium sulfate hemihydrate preparation from FGD gypsum in recycling mixed salt solutions

2011 ◽  
Vol 174 (1) ◽  
pp. 296-303 ◽  
Author(s):  
Baohong Guan ◽  
Li Yang ◽  
Hailu Fu ◽  
Bao Kong ◽  
Tingying Li ◽  
...  
Keyword(s):  
Calcium Sulfate ◽  
Salt Solutions ◽  
Mixed Salt ◽  
Fgd Gypsum ◽  
Mixed Salt Solutions ◽  
Calcium Sulfate Hemihydrate

Preparation of α-calcium sulfate hemihydrate from FGD gypsum in K, Mg-containing concentrated CaCl2 solution under mild conditions

Fuel ◽  
2009 ◽  
Vol 88 (7) ◽  
pp. 1286-1293 ◽  
Author(s):  
Baohong Guan ◽  
Liuchun Yang ◽  
Zhongbiao Wu ◽  
Zhuoxian Shen ◽  
Xianfa Ma ◽  
...  
Keyword(s):  
Calcium Sulfate ◽  
Fgd Gypsum ◽  
Mild Conditions ◽  
Calcium Sulfate Hemihydrate ◽  
Cacl2 Solution

Ionic distributions and competitive association in DNA/mixed salt solutions

1988 ◽  
Vol 92 (12) ◽  
pp. 3604-3612 ◽  
Author(s):  
Russell J. Bacquet ◽  
Peter J. Rossky
Keyword(s):  
Salt Solutions ◽  
Mixed Salt ◽  
Mixed Salt Solutions

Nanofiltration of single and mixed salt solutions: Analysis of results using principal component analysis (PCA)

2010 ◽  
Vol 88 (12) ◽  
pp. 1569-1579 ◽  
Author(s):  
Mehrdad Hesampour ◽  
Jukka Tanninen ◽  
Satu-Pia Reinikainen ◽  
Samantha Platt ◽  
Marianne Nyström
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Component Analysis ◽  
Salt Solutions ◽  
Mixed Salt ◽  
Analysis Of Results ◽  
Mixed Salt Solutions

Direct transformation of FGD gypsum to calcium sulfate hemihydrate whiskers: Preparation, simulations, and process analysis

Particuology ◽  
2015 ◽  
Vol 19 ◽  
pp. 53-59 ◽  
Author(s):  
Miao Miao ◽  
Xin Feng ◽  
Gangling Wang ◽  
Shaomei Cao ◽  
Wen Shi ◽  
...  
Keyword(s):  
Calcium Sulfate ◽  
Process Analysis ◽  
Direct Transformation ◽  
Fgd Gypsum ◽  
Calcium Sulfate Hemihydrate

Influence of Seed Crystal and Modifier on the Morphology of α-calcium Sulfate Hemihydrate Prepared by Salt Solution Method in Pilot Scale

2010 ◽  
Vol 168-170 ◽  
pp. 8-12
Author(s):  
Bao Kong ◽  
Bao Hong Guan ◽  
Liu Chun Yang
Keyword(s):  
Salt Solution ◽  
Calcium Sulfate ◽  
Solution Method ◽  
Pilot Scale ◽  
Seed Crystal ◽  
Flue Gas Desulfurization ◽  
Fgd Gypsum ◽  
Mixed Salts ◽  
Spherical Crystals ◽  
Calcium Sulfate Hemihydrate

Preparation of α-calcium sulfate hemihydrate (α-HH) from flue gas desulfurization (FGD) gypsum is of great value in effectively utilizing the FGD gypsum. This paper focuses on the effect of seed crystal and some modifiers on the morphology of α-HH on a 500-1000 kg/batch setup based on a salt solution method established on the previous work. The pilot tests were carried out in a Ca-Mg-K chloride solution medium at 94 oC (±2 oC) under atmospheric pressure. The results show that a small amount of seeds is advantageous to prepare short-prism α-HH but results in needle-like and spherical crystals in the case of more than 1% addition. The well-shaped α-HH crystals can also be obtained by adding appropriate amounts of crystal modifiers like Fe3+ and the mixed salts of Al3+ and organics.

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