A method for preparing nanometer calcium sulfate and calcium sulfate whiskers in an alcohol-water mixed system
A technology of nano-calcium sulfate and calcium sulfate whiskers, which is applied in the fields of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of unmanned research and development to prepare nano-calcium sulfate and its whiskers, calcium carbide slag, and calcium chloride by-products. Resources have not been well used, etc., to achieve the effect of large controllable range of conditions, simple operation and simple process
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Embodiment 1
[0051] Example 1: Preparation of calcium sulfate whiskers with calcium chloride and sodium sulfate as raw materials, ethanol and calcium solution volume ratio of 0:1, and different aging time conditions
[0052] Use a 50mL graduated cylinder to measure 10mL of 1mol / L CaCl 2 The solution was stirred with a magnet for 5 min at a stirring speed of 600 r / min. After stirring, add 10mL of 1mol / L sodium sulfate solution to the solution, stir and age the resulting slurry for 0h, 1h, 3h, and 5h respectively, then carry out suction filtration, and dry the obtained calcium sulfate in an oven at 100°C for 24h get the product.
[0053] The SEM image of the obtained sample is shown in figure 2 The results show that the initial morphology of the calcium sulfate generated is not uniform, and as the aging time increases, the calcium sulfate does not appear as a whisker-shaped product, and the calcium sulfate morphology is still fine and fibrous.
Embodiment 2
[0054] Example 2: Calcium sulfate whiskers were prepared by using calcium chloride and sodium sulfate as raw materials, the volume ratio of ethanol to calcium solution was 1:2, and different aging times.
[0055] Use a 50mL graduated cylinder to measure 5mL of absolute ethanol in a three-necked flask, and then add 10mL of 1mol / L CaCl to the flask 2 The solution was stirred with a magnet for 5 min at a stirring speed of 600 r / min. After stirring, add 10mL of 1mol / L sodium sulfate solution to the solution, stir and age the resulting slurry for 0h, 1h, 3h, and 5h respectively, then carry out suction filtration, and dry the obtained calcium sulfate in an oven at 100°C for 24h get the product.
[0056] The product obtained after the reaction was characterized by X-ray diffractometer (XRD). The obtained sample X-ray diffraction (XRD) is as follows figure 1 As shown in a, the obtained calcium sulfate crystal form is CaSO 4 0.5H 2 O. The SEM image of the obtained sample is shown...
Embodiment 3
[0057] Embodiment 3: take calcium chloride and sodium sulfate as raw material preparation, ethanol and calcium solution volume ratio are 1: 1, prepare calcium sulfate whisker under different aging time conditions.
[0058] Use a 50mL graduated cylinder to measure 10mL of absolute ethanol in a three-necked flask, and then add 10mL of 1mol / L CaCl to the flask 2 The solution was stirred with a magnet for 5 min at a stirring speed of 600 r / min. After stirring, add 10mL of 1mol / L sodium sulfate solution to the solution, stir and age the resulting slurry for 0h, 1h, 3h, and 5h respectively, then carry out suction filtration, and dry the obtained calcium sulfate in an oven at 100°C for 24h get the product.
[0059] The product obtained after the reaction was characterized by X-ray diffractometer (XRD). The obtained sample X-ray diffraction (XRD) is as follows figure 1 As shown in b, the obtained calcium sulfate crystal form is CaSO 4 0.5H 2 O. The SEM image of the obtained samp...
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