Control system and method for continuous mixing of slurry with removal of entrained bubbles

A method for controlling the continuous mixing of slurry with removal of entrained bubbles comprising:

• providing a powder fluid rate control, wherein said powder and fluid rate control is coupled to a mixer through a powder feeder and liquid pump, wherein said powder and fluid rate control further comprises,
• a first setpoint;
• a two-input powder and fluid rate controller having,
• a first input coupled to said first setpoint;
• a second input coupled to a level sensor, and
• an output coupled to a first input of a first two input calculation element;
• a second set point coupled to a second input of said first two-input calculation element, said first two-input calculation element having an output coupled to said powder feeder and;
• a second calculation element having,
• a first input coupled to said second setpoint and
• a second input coupled to said powder feeder to receive an actual rate of powder addition signal, said second calculation element having an output coupled to said level sensor through said liquid pump;
• coupling a fluid level control to said mixer and a surge tank;
• and
• coupling a flow rate control to said surge tank.