Patent ID: 7718019

Claim:
A method of preparing a heat resistant accelerant slurry and introducing the slurry into a post-mixer aqueous dispersion of calcined gypsum in a discharge apparatus, the method comprising: introducing a dry-milled heat resistant accelerator (HRA) into a first mixing device, wherein the HRA comprises a coating selected from the group consisting of sugar, starch, boric acid, a long chain fatty acid, and a salt of a long chain fatty acid; adding a liquid medium into the first mixing device; mixing the dry-milled HRA and liquid medium in the first mixing device to form the HRA slurry; forming the aqueous dispersion of calcined gypsum in a second mixing device; discharging the aqueous dispersion from the second mixing device into a discharge apparatus; transferring the HRA slurry from the first mixing device into the discharge apparatus, wherein the HRA slurry does not contain an organic phosphonate or phosphate.