Fluorapatite (Ca5F(PO4)3) → Calcium Hydroxide

A fluid bed reactor unit of the type illustrated in the drawing, having a bed diameter of 10 feet, operates on a feed of about 60 TPH (short tons per hour) of phosphate rock calcines having particle sizes up to -4 mesh. The hot calcines are introduced tnto the fluid bed reactor unit at a temperature of about 500°-600° C (932°-1112° F). The calcines contain about 10-15 % by weight, of CaO. Cooling water is sprayed on the fluidized bed at the rate of 20-30 GPH (Gallons Per Hour) and a fluidizing air stream is introduced through the windbox of the fluid bed reactor at ambient temperature. An additional quantity of water is introduced through a conduit which supplies a plurality of nozzles positioned within the fluidized bed and just above the level of the constriction plate of the fluid bed reactor at the rate of 10-15 GPH. About 55 TPH of beneficiated phosphate rock product is produced at a temperature of about 160°-170° C (320° -338° F) and about 5 TPH of calcium hydroxide having an average particle size of up to -65 mesh is elutriated by the fluidizing gas and obtained as separated waste or by-product. The slaking reaction transforms about 85% of the CaO to calcium hydroxide, and the separation which occurs in the fluid bed reactor is effective to separate about 75% of the calcium hydroxide from the phosphate rock calcines.

1. customA fluid bed reactor unit of the type illustrated in the drawing
2. additionThe hot calcines are introduced tnto the fluid bed reactor unit at a temperature of about 500°-600° C (932°-1112° F)
3. additiona fluidizing air stream is introduced through the windbox of the fluid bed reactor at ambient temperature

ORD record

ord-d5570dc760274d0e870ba096739c7b53

Source dataset

uspto-grants-1978_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04083929