Patent ID: 11918972
Assignee: DECARBON TECHNOLOGY (SHENZHEN) CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 1:
2. The preparation method according to claim 1, wherein in the step of leaching, the alkali agent is a sodium hydroxide aqueous solution, the sodium hydroxide aqueous solution and the fly ash are mixed and heated to undergo a hydrothermal reaction, followed by filtration and separation to obtain the silicate leaching solution and desilicified fly ash, the silicate leaching solution is a sodium silicate leaching solution, and the desilicified fly ash is used for recycling alumina; and
in the step of leaching, the mass ratio of sodium hydroxide in the sodium hydroxide aqueous solution to the fly ash is 0.4:1 to 0.8:1, the sodium hydroxide aqueous solution has a concentration of 10-30 wt %, and the hydrothermal reaction is carried out at 105-115° C. for 0.4-0.6 h.