Method for preparing anhydrous calcium sulfate crystal whisker
A technology of calcium sulfate anhydrous and calcium sulfate hemihydrate, applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve the problems of uneven particle size and uneven aspect ratio of anhydrous calcium sulfate whiskers , to achieve the effect of inhibiting radial growth, accelerating speed and increasing contact area
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[0009] The present embodiment provides a kind of preparation method of anhydrous calcium sulfate whisker, specifically comprises the steps:
[0010] (1) Raw material pretreatment: pulverize and finely grind raw gypsum with a purity greater than 90%, and sieve raw gypsum powder with a particle size of less than 20mm.
[0011] (2) Prepare raw materials according to the following mass ratio: take raw gypsum powder and sulfuric acid solution according to the mass ratio of raw gypsum powder and sulfuric acid solution as 2 to 4:1, wherein the concentration of sulfuric acid solution is 10% to 20%; then respectively according to dispersant and sulfuric acid solution The mass ratio of the sulfuric acid solution is 0.005-0.01 and the mass ratio of the crystal-transforming agent to the sulfuric acid solution is 0.0003-0.0008. Weigh the dispersant and the crystal-transforming agent;
[0012] (3) Aging reaction: add raw gypsum powder to sulfuric acid solution, stir while adding, after stir...
Embodiment 1
[0016] The present embodiment provides a kind of preparation method of anhydrous calcium sulfate whisker, specifically comprises the following steps:
[0017] (1) Raw material pretreatment: pulverize and finely grind raw gypsum with a purity greater than 90%, and sieve raw gypsum powder with a particle size of less than 20mm.
[0018] (2) Prepare materials according to the following mass ratio: weigh 3000g of raw gypsum powder, 1000g of 10% sulfuric acid solution, 8g of sodium lauryl sulfate, 0.72g of aluminum potassium sulfate and 0.08g of sodium citrate.
[0019] (3) Aging reaction: add raw gypsum powder to sulfuric acid solution, stir while adding, after stirring and mixing evenly, filter out the filter residue, then add dispersant and crystal modifier to the filtrate in turn, and stir and mix evenly, put the mixed solution in Heat up in a constant temperature oil bath, continue to heat up to 100°C, and keep the temperature at 100°C to age the mixed solution for 1 hour. Aft...
Embodiment 2
[0023] The present embodiment provides a kind of preparation method of anhydrous calcium sulfate whisker, specifically comprises the following steps:
[0024] (1) Raw material pretreatment: pulverize and finely grind raw gypsum with a purity greater than 90%, and sieve raw gypsum powder with a particle size of less than 20 mm.
[0025] (2) Prepare materials according to the following mass ratios: weigh 2000g raw gypsum powder, 1000g concentration of 15% sulfuric acid solution, 10g sodium lauryl sulfate, 0.2625g aluminum potassium sulfate and 0.0375g sodium citrate.
[0026] (3) Aging reaction: add raw gypsum powder to sulfuric acid solution, stir while adding, after stirring and mixing evenly, filter out the filter residue, then add dispersant and crystal modifier to the filtrate in turn, and stir and mix evenly, put the mixed solution in Heat up in a constant temperature oil bath, continue to heat up to 95°C, and keep the temperature at 95°C to age the mixed solution for 2 ho...
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Abstract
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