Back to results
US 2022/0089879 A1Published application
Production of surface-reacted calcium salts by grinding induced conversion
AssigneeOmya International AG
InventorsDaniel E. GERARD, Lassi KARVONEN
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for producing an aqueous suspension of surface-reacted calcium salt particles by mixing a calcium salt excluding monocalcium phosphate and dicalcium phosphate, a calcium phosphate selected from monocalcium phosphate and/or dicalcium phosphate, with water, and grinding the obtained aqueous suspension at a pH value of at least 4.2 to form an aqueous suspension of surface-reacted calcium salt particles.
Claims21
A process for producing an aqueous suspension of surface-reacted calcium salt particles comprising the steps of:
- a) providing a calcium salt excluding monocalcium phosphate and dicalcium phosphate,
- b) providing a calcium phosphate selected from monocalcium phosphate and/or dicalcium phosphate,
- c) forming an aqueous suspension by mixing the calcium salt of step a), and the calcium phosphate of step b) with water, and
- d) grinding the aqueous suspension of step c) at a pH value of at least 4.2 to form an aqueous suspension of surface-reacted calcium salt particles,
- wherein the calcium salt of step a) and the calcium phosphate of step b) in combination have a calcium ion to phosphate ion molar ratio (Ca2+:PO43−) in the range from 1.75:1 to 100:1.
2 more elements
(canceled)
Dependencies are inferred from the claim text.