Method for preparing alpha-hemihydrate gypsum from flue gas desulfurization gypsum
A technology of desulfurized gypsum and hemihydrate gypsum, which is applied in the field of gypsum-based building materials preparation, can solve the problems of gypsum dehydration and slow crystal conversion rate, high pressure required, poor controllability of α-hemihydrate gypsum composition and morphology, etc. Achieve the effect of good shape and size uniformity, low cost and high density
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0029] Weigh 0.085 mol of sodium chloride and 0.2 mmol of disodium edetate in a 30% glycerin-water solution and mix them uniformly, and then add 50 g of flue gas desulfurized gypsum to form a slurry. The temperature of the slurry was maintained at 90°C by heat transfer oil, stirred at a constant speed for 2h, and transferred to a 100mL reactor. The reaction temperature was 100°C and the reaction time was 2h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the product was centrifuged, washed with water and ethanol three times in sequence, and then placed in a vacuum drying oven at 60° C. and vacuum dried for 12 hours to obtain light yellow powder α-hemihydrate gypsum.
Embodiment 2
[0031] Weigh 0.085 mol of sodium chloride and 0.2 mmol of disodium edetate in a 30% glycerin-water solution and mix them uniformly, and then add 50 g of flue gas desulfurized gypsum to form a slurry. The temperature of the slurry was maintained at 90°C by heat transfer oil, stirred at a constant speed for 2h, and transferred to a 100mL reactor. The reaction temperature was 120°C and the reaction time was 2h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the product was centrifuged, washed with water and ethanol three times in sequence, and then placed in a vacuum drying oven at 60° C. and vacuum dried for 12 hours to obtain light yellow powder α-hemihydrate gypsum.
Embodiment 3
[0033] Weigh 0.085 mol of sodium chloride and 0.2 mmol of disodium edetate in a 30% glycerin-water solution and mix them uniformly, and then add 50 g of flue gas desulfurized gypsum to form a slurry. The temperature of the slurry was maintained at 90°C by heat transfer oil, stirred at a constant speed for 2h, and transferred to a 100mL reactor. The reaction temperature was 140°C and the reaction time was 2h. After the reaction, the reaction kettle was naturally cooled to room temperature, and the product was centrifuged, washed with water and ethanol three times in sequence, and then placed in a vacuum drying oven at 60° C. and vacuum dried for 12 hours to obtain light yellow powder α-hemihydrate gypsum.
PUM
| Property | Measurement | Unit |
|---|---|---|
| specific surface area | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More