A method for removing impurities from desulfurized gypsum in a power plant
A technology for desulfurized gypsum and power plants, applied in the field of industrial by-product gypsum resource utilization, can solve the problems of slow crystal transformation, long time consumption, inability to separate, etc.
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Embodiment 1
[0038] Example 1: Weigh 1 kg of dihydrate gypsum raw material obtained by desulfurization in a power plant, measure 6 kg of clear water, stir thoroughly, and pass through a 300-mesh vibrating sieve to remove large particles of impurities. Add 4kg of clear water to the sieved slurry to make the slurry concentration approximately gypsum:water = 1:10; add sulfuric acid to adjust the pH value of the slurry to 2.5, add 50g of sodium chloride, sodium dodecylbenzenesulfonate 5g. Put the adjusted slurry into the high-pressure reactor with enamel lining, set the maximum reaction temperature to 125°C, the reaction pressure to 0.15Mpa, the holding time to 5h, and the stirring speed to 60r / min. After the reaction, the slurry was transferred to a plastic container, allowed to stand and cooled to room temperature, and continued to cool for 1 h after cooling down to room temperature. Stir the cooled slurry, then let it stand still, and pour out the upper layer of turbid liquid after the ini...
Embodiment 2
[0039] Example 2: Weigh 0.8 kg of dihydrate gypsum raw material obtained by desulfurization in a power plant, measure 6 kg of clear water, stir thoroughly, and pass through a 300-mesh vibrating sieve to remove large particles of impurities. Add 4kg of clear water to the sieved slurry to make the slurry concentration approximately gypsum: water = 0.8:10; add sulfuric acid to adjust the pH value of the slurry to 5; add 30g of aluminum sulfate; add sodium dodecylbenzenesulfonate 3g. Put the adjusted slurry into a high-pressure reactor with enamel lining, set the maximum reaction temperature to 160°C, the reaction pressure to 0.60Mpa, the holding time to 0.5h, and the stirring speed to 60r / min. After the reaction, the slurry was transferred to a plastic container, allowed to stand and cooled to room temperature, and continued to cool for 1 h after cooling down to room temperature. Stir the cooled slurry, and then use conventional hydrocyclone separation to remove the tiny particl...
Embodiment 3
[0040] Embodiment 3: the added value of aluminum sulfate in embodiment 2 is increased by 80g, all the other process conditions and methods are unchanged, and the whiteness of the obtained impurity-removing gypsum is 85%.
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