Narrow particle size distribution calcium carbonate and methods of making same

摘要

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.

主权项

1. 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.