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US 2015/0083831 A1Published application
Narrow Particle Size Distribution Calcium Carbonate and Methods of Making Same
AssigneeJ.M. Huber Corporation
InventorsLane George Shaw, Gary Lee Hillebrenner
Life of this patent
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Abstract
Calcium carbonate particles having very narrow particle sizes with a controlled D98 and minimal ultrafines (very small particles) are described. The particles are prepared by grinding a feedstock in a centrifugal grinding mill, which utilizes very high centrifugal forces to impact the particles with each other or grinding media.
Claims20
1-11. (canceled)
A method for preparing alkaline earth metal carbonate particles, comprising:
- grinding an alkaline earth metal carbonate feedstock in a centrifugal grinding mill to produce ground alkaline earth metal carbonate particles having a median particle size (D50) of from 1 to 3 microns;
- wherein the ratio of D50 to D98, D50:D98, is at least 36:100;
- and wherein the alkaline earth metal carbonate feedstock is of sedimentary origin.
A method for preparing alkaline earth metal carbonate particles, comprising:
- grinding an alkaline earth metal carbonate feedstock in a centrifugal grinding mill to produce ground alkaline earth metal carbonate particles having a median particle size (D50) of from 1 to 3 microns;
- wherein:
- grinding comprises impacting the alkaline earth metal carbonate feedstock with itself and a grinding media in the centrifugal grinding mill;
- the ground particles have a ratio of D50 to D98, D50:D98, of at least 36:100;
- and
- the alkaline earth metal carbonate feedstock is of sedimentary origin.
3 more elements
Dependencies are inferred from the claim text.