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US 9,718,687 B2Granted
Method of converting limestone into tri-calcium phosphate and tetra-calcium phosphate powder simultaneously
AssigneeSIRIM Berhad
InventorsFazilah Binti Fazan, Sudirman Bin Sahid, Wan Ruzaini Bin Wan Sulaiman, Nor Shahida Binti Kader Bashah
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Abstract
The present invention relates to a method of converting limestone into tri-calcium phosphate (TCP) and tetra-calcium phosphate (TTCP) powder simultaneously. In particular, the method provides for a method of converting limestone into TCP and TTCP powder simultaneously having specific particle size and with specific crystallographic structure.
Claims21
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.
1 more element
Dependencies are inferred from the claim text.