Microwave preparation method of alpha-calcium sulfate hemihydrate
A technology of calcium sulfate hemihydrate and calcium sulfate dihydrate, which is applied in the field of preparation of α-calcium sulfate hemihydrate, can solve the problems of multiple impurities, low added value, high free water, etc., and achieve the effect of shortening the reaction time
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Embodiment 1
[0029] Add 5.0g calcium sulfate dihydrate and 100mL mixed salt solution (calcium chloride 100g / L, sodium chloride 50g / L) into the reaction vessel, put it into the CW-2000 ultrasonic / microwave collaborative extraction / reaction instrument, set the program: Under the combined action of ultrasonic waves and microwaves, the temperature of the reaction system was raised to 105°C at a heating rate of 4°C / min, and then kept at a constant temperature for 2 hours; immediately after the reaction, the reaction mixture was filtered and washed, and the solid product was dried in an oven at 60°C After 19 hours, α-calcium sulfate hemihydrate was obtained.
[0030] figure 2 It is the scanning electron micrograph of the prepared α-calcium sulfate hemihydrate, by figure 2 It can be seen that the prepared α-calcium sulfate hemihydrate has a uniform fibrous structure with an average length of 112.9 μm and an average diameter of 7.37 μm.
Embodiment 2
[0032] Add 5.0g calcium sulfate dihydrate and 100mL mixed salt solution (calcium chloride 100g / L, sodium chloride 50g / L) into the reaction vessel, put it into the CW-2000 ultrasonic / microwave collaborative extraction / reaction instrument, set the program: Under the combined action of ultrasonic waves and microwaves, the temperature of the reaction system was raised to 105°C at a heating rate of 8°C / min, and then kept at a constant temperature for 3 hours; immediately after the reaction, the reaction mixture was filtered and washed, and the solid product was placed in an oven at 60°C Dry for 12 hours to obtain α-calcium sulfate hemihydrate.
[0033] image 3 is the scanning electron micrograph of the prepared α-calcium sulfate hemihydrate, by image 3 It can be seen that the prepared α-calcium sulfate hemihydrate has a uniform fibrous structure with an average length of 113.78 μm and an average diameter of 8.31 μm.
[0034] Figure 4 is the XRD pattern of the prepared α-calcium...
Embodiment 3
[0040] Add 8.0g calcium sulfate dihydrate and 100mL mixed salt solution (calcium chloride 80g / L, sodium chloride 50g / L) into the reaction vessel, put it into the CW-2000 ultrasonic / microwave collaborative extraction / reaction instrument, set the program: Under the combined action of ultrasonic waves and microwaves, the temperature of the reaction system was raised to 105°C at a heating rate of 2°C / min, and then kept at a constant temperature for 3 hours; immediately after the reaction, the reaction mixture was filtered and washed, and the solid product was placed in an oven at 60°C Dry for 18 hours to obtain α-calcium sulfate hemihydrate. The crystal morphology of the obtained α-calcium sulfate hemihydrate was a uniform fibrous structure, the average crystal length was 110.78 μm, and the average diameter was 7.31 μm.
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