Stabilization of precipitated calcium carbonate

Details Stabilization of precipitated calcium carbonate Stabilization of precipitated calcium carbonate

B - Operations, Transporting

01

F

B01F 17/48 (2006.01) C01F 11/18 (2006.01) C08K 5/05 (2006.01)

Patent

CA 2081831

STABILIZATION OF PRECIPITATED CALCIUM CARBONATE Abstract of the Disclosure Method of preventing destabilization of an aqueous slurry of crystalline precipitated calcium carbonate (PCC), as made by the carbonation process. The slurry is treated after crystallization by adding a stabilizing factor as one or more agents selected from the group consisting of dry hydroxy ethyl cellulose of wet and dry types, hydropho- bically modified hydroxy ethyl cellulose of wet and dry types, alkali-soluble acrylic polymers, alkali swellable associate thickeners, attapulgite clays, algenates, sodium algenate, starches, hydrophobically modified hydroxy ethyl cellulose, alkali-soluble acrylic polymers, alkali swellable associate thickeners, attapulgite clays, algenates, sodium algenate, starches, hydroxypropyl methylcellulose, urethane associative stabilizers, hydroxybutyl methylcellulose, hydroxypropyl cellulose, guar and natural gum derivatives, carbon dioxide in gaseous form, and mixtures of the foregoing, in amount as determined by viscosity adjustment to be sufficient to prevent destabilization of the slurry in bulk quantity without agitation or further treatment for a long period, providing a stabilized new commercial PCC slurry product with PCC content of 20-75%/w, capable of storage or shipment without stratification or gelation for at least 30 days.

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