Patent ID: 11891344
Assignee: CHTEM LIMITED
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 18:
19. The method for graded utilization of fluorine and silicon resources in a phosphate ore of claim 18, wherein the low-temperature distillation in the step (9) includes a first-stage distillation and a second-stage distillation; the first-stage distillation is to remove the impurities with the low boiling point, a pressure at a top of a tower is within a range of 0.95 MPaA to 1.15 MPaA, a temperature at the top of the tower is within a range of −56° C. to −51° C., a pressure of a tower kettle is within a range of 1.0 MPaA to 1.2 MPaA, a temperature of the tower kettle is within a range of −51° C. to −47° C.; and the second-stage distillation is to remove the impurities with the high boiling point, the pressure at the top of the tower is within a range of 0.85 MPaA to 1.05 MPaA, the temperature at the top of the tower is within a range of 60° C. to −55° C., the pressure of the tower kettle is within a range of 0.9 MPaA to 1.1 MPaA, the temperature of the tower kettle is within a range of −55° C. to −50° C.