Preparation method for vaterite calcium carbonate crystals with layered structure
A layered structure and vaterite technology, which is applied in the preparation of calcium carbonate inorganic minerals and vaterite calcium carbonate crystals, can solve the problem of high cost of raw materials, achieve simple preparation process, wide source of raw materials, and good monodispersity Effect
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Embodiment 1
[0021] 1) Add 0.2 g of sodium lignosulfonate into 1.0 L of deionized water, stir and dissolve at 20°C, filter to remove insoluble impurities, and obtain a sodium lignosulfonate solution with a concentration of 0.2 g / L;
[0022] 2) Add 0.79g of calcium acetate to the aqueous solution of sodium lignosulfonate and stir to dissolve, then add 0.3g of urea and stir to dissolve (the concentration of urea is 0.5mmol / L), and mix the solution (the concentration of calcium acetate is 0.5m mol / L) into a sealed container and placed in a constant temperature oven at 60°C for 24 hours. After the constant temperature was over, the mixed solution was filtered and separated, washed and dried to obtain vaterite calcium carbonate crystals with a layered structure.
Embodiment 2
[0024] 1) Add 20.0g sodium lignosulfonate into 1.0L deionized water, stir and dissolve at 60°C to obtain a sodium lignosulfonate aqueous solution with a concentration of 20.0g / L;
[0025] 2) Add 1.58g of calcium acetate to the aqueous solution of sodium lignosulfonate and stir to dissolve, then add 3.6g of urea and stir to dissolve (the concentration of urea is 100.0mmol / L), and mix the solution (the concentration of calcium acetate is 10.0 mg mol / L) into a sealed container, and placed in a constant temperature oven, kept at 100°C for 5 hours. After the constant temperature was over, the mixed solution was centrifuged, washed, and dried to obtain vaterite calcium carbonate with a layered structure.
Embodiment 3
[0027] 1) Add 5g sodium polystyrene sulfonate into 1.0L deionized water, stir and dissolve at 40°C to obtain a sodium lignosulfonate aqueous solution with a concentration of 5.0g / L;
[0028] 2) Add 3.16g of calcium acetate to the polystyrene sodium sulfonate aqueous solution and stir to dissolve, then add 3.6g of urea and stir to dissolve (the concentration of urea is 280.0mmol / L), and the mixed solution (the concentration of calcium acetate is 20.0 mg mol / L) to a sealed container, and placed in a constant temperature oven, kept at 90°C for 18 hours. After the constant temperature was over, the mixed solution was filtered and separated, washed and dried to obtain vaterite calcium carbonate with layered structure.
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