Patent ID: 9718687
Date: 2017-08-01
CPC Classifications: C01B,C01P

Claim:
1. A method of converting, limestone into tri-calcium phosphate (TCP) and tetra-calcium phosphate (TTCP) powder, said method comprising the steps of: a. synthesizing slurry apatite from limestone, b. spray drying the slurry apatite obtained in step (a) to obtain raw apatite powder, c. firing the raw apatite powder obtained in step (b) in an atmospheric furnace condition to obtain TCP and TTCP coarse powder simultaneously, wherein the atmospheric furnace condition is maintained by a continuous feed of nitrogen gas into the furnace, d. grinding the TCP and TTCP coarse powder obtained in step (c) to produce TCP and TTCP powder having particle size ranging from 1-150 microns and with median at ˜30 microns.