High-strength geopolymer hollow microsphere, preparation method thereof and phase change energy storage microsphere

A method of preparing high-strength geopolymer hollow microspheres, comprising:

• dissolving sodium hydroxide (NaOH), sodium silicate (Na2SiO3.9H2O) and a spheroidizing aid in water to form a solution, adding active powder to the solution to obtain a first mixture, stirring and uniformly mixing the first mixture to form a slurry, adding the slurry to an oil phase dispersion medium to obtain a second mixture, stirring the second mixture to disperse the slurry into the oil phase dispersion medium to form balls, after the stirring, filtering the second mixture to obtain geopolymer microspheres, washing the geopolymer microspheres, and then carrying out a high-temperature calcination on the geopolymer microspheres to obtain the high-strength geopolymer hollow microspheres;
• wherein a mass percentage of the sodium hydroxide (NaOH), the sodium silicate (Na2SiO3.9H2O) and the spheroidizing aid is (10-40%):
• (20-60%):
• (20-60%), a mass ratio of the water to the active powder is 1:2-1, the slurry accounts for 5%-50% of a volume of the oil phase dispersion medium, a temperature of the high-temperature calcination is 800-1500° C., and a time of the high-temperature calcination is 1-8 hours.