Surface modification of calcium sulfate whisker prepared from flue gas desulfurization gypsum

2016 ◽  
Vol 360 ◽  
pp. 263-269 ◽  
Author(s):  
Chengjun Liu ◽  
Qing Zhao ◽  
Yeguang Wang ◽  
Peiyang Shi ◽  
Maofa Jiang
Keyword(s):  
Surface Modification ◽  
Flue Gas ◽  
Calcium Sulfate ◽  
Flue Gas Desulfurization ◽  
Calcium Sulfate Whisker

scholarly journals Hydrothermal synthesis of calcium sulfate whisker from flue gas desulfurization gypsum

2016 ◽  
Vol 24 (11) ◽  
pp. 1552-1560 ◽  
Author(s):  
Chengjun Liu ◽  
Qing Zhao ◽  
Yeguang Wang ◽  
Peiyang Shi ◽  
Maofa Jiang
Keyword(s):  
Hydrothermal Synthesis ◽  
Flue Gas ◽  
Calcium Sulfate ◽  
Flue Gas Desulfurization ◽  
Calcium Sulfate Whisker

Preparation of Calcium Sulfate Whisker by Hydrothermal Method from Flue Gas Desulfurization (FGD) Gypsum

2012 ◽  
Vol 268-270 ◽  
pp. 823-826 ◽  
Author(s):  
Liu Shuan Yang ◽  
Xiao Wang ◽  
Xin Feng Zhu ◽  
Ling Zhi Du
Keyword(s):  
Hydrothermal Method ◽  
Reaction Temperature ◽  
Flue Gas ◽  
Calcium Sulfate ◽  
Raw Materials ◽  
Flue Gas Desulfurization ◽  
Minor Effect ◽  
Fgd Gypsum ◽  
Excellent Quality ◽  
Calcium Sulfate Whisker

In this paper, utilizing the purified flue gas desulfurization (FGD) gypsum as raw materials to prepare calcium sulfate whisker (CSW) by hydrothermal method, the effects of the dosage of crystal modifier, reaction temperature, pH, etc. on the crystal morphology of CSW were discussed. The results show that the purified FGD gypsum can replace high-quality natural gypsum for the preparation of the CSW with excellent quality. The dosage of crystal modifier (K2SO4) and reaction temperature have a significant effect on the morphology and aspect ratio of CSW, while pH and reaction time have a minor effect. When the dosage of K2SO4 is 3 wt%, pH is adjusted to 2 and the solution is reacted at 130 °C for 60 min, CSW with excellent quality can be obtained.

Kinetic model for calcium sulfate α-hemihydrate produced hydrothermally from gypsum formed by flue gas desulfurization

2015 ◽  
Vol 48 (3) ◽  
pp. 827-835 ◽  
Author(s):  
Mingliang Tang ◽  
Xuerun Li ◽  
Yusheng Shen ◽  
Xiaodong Shen
Keyword(s):  
Flue Gas ◽  
Calcium Sulfate ◽  
High Performance ◽  
Transformation Process ◽  
Flue Gas Desulfurization ◽  
Synthesis Process ◽  
Stable Phase ◽  
Hydrothermal Conditions ◽  
Simple Method ◽  
Kinetics Of

Modeling of the kinetics of the synthesis process for calcium sulfate α-hemihydrate from gypsum formed by flue gas desulfurization (FGD) is important to produce high-performance products with minimal costs and production cycles under hydrothermal conditions. In this study, a model was established by horizontally translating the obtained crystal size distribution (CSD) to the CSD of the stable phase during the transformation process. A simple method was used to obtain the nucleation and growth rates. A nonlinear optimization algorithm method was employed to determine the kinetic parameters. The model can be successfully used to analyze the transformation kinetics of FGD gypsum to α-hemihydrate in an isothermal batch crystallizer. The results showed that the transformation temperature and stirring speed exhibit a significant influence on the crystal growth and nucleation rates of α-hemihydrate, thus altering the transformation time and CSD of the final products. The characteristics obtained by the proposed model can potentially be used in the production of α-hemihydrate.

Mechanism of Inorganic-organic Surface Modification of Anhydrous Calcium Sulfate Whisker

2017 ◽  
Vol 32 (1) ◽  
pp. 81
Author(s):  
LV Zhi-Hui ◽  
HONG Tian-Zeng ◽  
NAI Xue-Ying ◽  
DONG Ya-Ping ◽  
LI Wu
Keyword(s):  
Surface Modification ◽  
Calcium Sulfate ◽  
Anhydrous Calcium Sulfate ◽  
Calcium Sulfate Whisker
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