Patent ID: 8066421
Filing Date: 2011-11-29
Classification: B01F,B28C,C04B

Abstract:
1. A method for adding sodium trimetaphosphate to a gypsum slurry, the method comprising the steps of: providing a mixer with a hopper connected to the mixer, a pulp waterline feeding into the mixer and at least one other waterline feeding into the mixer wherein the other waterline is apart from the pulp waterline; adding stucco and at least one other dry ingredient to the mixer through the hopper; adding water and at least one other wet ingredient to the mixer through the pulp waterline; forming a gypsum slurry by mixing stucco, the at least one other dry ingredient with water and the at least one other wet ingredient in the mixer; and adding sodium trimetaphosphate to the at least one other waterline so that the sodium trimetaphosphate is fed into the mixer and added to the gypsum slurry.