Study on Preparation of High-Strength Gypsum by FGD Gypsum
| Autor: | Weixing Wang, Yan Shao, Xiao Shu Wang, Hao Bo Hou, Min Zhou |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
chemistry.chemical_classification
Materials science Gypsum Waste management Chlorate General Engineering Salt (chemistry) engineering.material medicine.disease Flue-gas desulfurization chemistry.chemical_compound Compressive strength chemistry Flexural strength medicine engineering Dehydration Sulfate Nuclear chemistry |
| Zdroj: | Advanced Materials Research. 878:292-297 |
| ISSN: | 1662-8985 |
| DOI: | 10.4028/www.scientific.net/amr.878.292 |
| Popis: | With the enlarging of industrial desulfurization, the amount of FGD gypsum is increasing rapidly. The preparation of alpha-calcium sulfate hemihydrate (α-HH) is one of the biggest concerns for FGD gypsum reclamation. The influence of mixed chlorate solution of Mg-Ca-Na concentrations (5-30 wt%) and FGD gypsum concentrations (5-30 wt%) by hydrothermal salt solution method at atmospheric were investigated at temperatures (75-99°C) within a reaction time of 4h and a pH value of neutral. The results showed that 20 wt%, 20 wt% and 97°C was respectively optimal parameter of salt media concentration, FGD gypsum concentration and temperature. Products obtained from the dehydration process of optional experimental conditions with mixed crystal modifier were characterized based on relevant standards in this study. The results showed that α-HH had integrity crystal structure, 2h flexural strength and oven dry compressive strength were 5.34MPa and 30.21MPa, which had meet the industry standards of α30 grade. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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