Patent ID: 11920213
Assignee: GUANGDONG BRUNP RECYCLING TECHNOLOGY CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H  Y | IPC C  H

Claim 2:
3. The method of claim 1, wherein, the specific operation of step (3) involves: raising the temperature to 300-400° C. at a ramp rate of 3-5° C./min, maintaining the flow rate, continuing to introduce the pretreatment gas for 20-60 min, and maintaining the gas flow rate; reducing the temperature to 20-40° C. and then introducing the reaction gas at a flow rate of 10-50 mL/min; raising the temperature to 200-240° C. at a ramp rate of 3-5° C./min, maintaining the temperature and introducing the reaction gas for 1-3 h; raising the temperature to 280-320° C. at a ramp rate of 3-5° C./min, maintaining the temperature and introducing the reaction gas for 2-3 h; further raising the temperature to 360-380° C. at a ramp rate of 3-5° C./min, maintaining the temperature and introducing the reaction gas for 1-3 h; and finally raising the temperature to 450-470° C. at a ramp rate of 3-5° C./min, maintaining the temperature, introducing the reaction gas for 2-4 h, turning off the reaction gas, introducing the pretreatment gas, and reducing the temperature to 20-35° C.