Mixing procedure, effect, flocculation

Procedure. Initially, the flocculation procedure adopted was to add polymer to the clay suspension, stir rapidly for 15 seconds to ensure good mixing and then to flow the treated suspension through a 3 m length of coiled 1 mm diameter tubing. Tube flow is known to be an effective method of applying shear to a suspension and hence promoting orthokinetic flocculation (12). 

Figure 5. Effect of different flocculation procedures, using polymer A and a kaolin concentration of 140 mg/1. Procedures 1) Rapid mixing only, 2) Rapid mixing and tube flow (as in Figure 1) 3) Rapid mixing and slow...

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