Method for preparing high-whiteness short-column submicron-scale alpha-hemihydrate gypsum by using desulfurized gypsum
A desulfurization gypsum, sub-micron technology, applied in the field of high-whiteness short-column sub-micron α-hemihydrate gypsum, which can solve the problems of secondary pollution and achieve strong injectability, high strength, and increased production costs
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Embodiment 1
[0033] Embodiment 1: The specific operation is as follows
[0034](1) Preparation of rhombohedral product:
[0035] Prepare N.N'-methylenebisacrylamide, water, and desulfurized gypsum according to N.N'-methylenebisacrylamide: desulfurized gypsum: water = 0.3g:9g:100mL, prepare a reaction slurry and place it in a polytetrafluoroethylene Ethylene reactor, and heated to 120 ° C for 140 minutes;
[0036] (2) filtering the slurry obtained in step (1), and washing the obtained filter cake with deionized water until neutral;
[0037] (3) Drying: Dry the product obtained in step (2) at 100°C for 4 hours to obtain the intermediate product, as shown in the attached figure 2 As shown, the product is a prismatic product with uniform appearance.
[0038] (4) The intermediate product, NaCl, succinic acid, ethylene glycol, and water are prepared according to the mass ratio: intermediate product: NaCl: succinic acid: ethylene glycol: water=18:3:0.02:0.2:100 to prepare a reaction slurry; ...
Embodiment 2
[0042] Embodiment 2: specific operation is as follows
[0043] (1) Preparation of rhombohedral product:
[0044] Prepare N.N'-methylenebisacrylamide, water, and desulfurized gypsum according to N.N'-methylenebisacrylamide: desulfurized gypsum: water = 0.3g:9g:100mL and place the reaction slurry in polytetrafluoroethylene Reactor, and heated to 120 ℃ for 140min;
[0045] (2) filtering the slurry obtained in step (1), and washing the obtained filter cake with deionized water until neutral;
[0046] (3) drying: drying the product obtained in step (2) at 100°C for 4 hours to obtain the intermediate product;
[0047] (4) intermediate product, NaCl, succinic acid, ethylene glycol, water according to mass ratio: intermediate product: NaCl: succinic acid: ethylene glycol: water=18:3:0.02:0.96:100 preparation reaction slurry;
[0048] (5) The reaction slurry obtained in (4) was placed in a polytetrafluoroethylene reactor, and reacted for 3 hours at a temperature of 120° C. and a sti...
Embodiment 3
[0050] Embodiment 3: specific operations are as follows
[0051] (1) Preparation of rhombohedral product:
[0052] Prepare N.N'-methylenebisacrylamide, water, and desulfurized gypsum according to N.N'-methylenebisacrylamide: desulfurized gypsum: water = 0.3g:9g:100mL and place the reaction slurry in polytetrafluoroethylene Reactor, and heated to 120 ℃ for 140min;
[0053] (2) filtering the slurry obtained in step (1), and washing the obtained filter cake with deionized water until neutral;
[0054] (3) drying: drying the product obtained in step (2) at 100°C for 4 hours to obtain the intermediate product;
[0055] (4) intermediate product, NaCl, succinic acid, ethylene glycol, water according to mass ratio: intermediate product: NaCl: succinic acid: ethylene glycol: water=18:3:0.02:1.61:100 preparation reaction slurry;
[0056] (5) The reaction slurry obtained in (4) was placed in a polytetrafluoroethylene reactor, and reacted for 3 hours at a temperature of 120° C. and a s...
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