Abstract
INVESTIGATION OF THE SHEARING EFFECTS ON THE FINES FLOC SIZE AND FLOCCULATION PARAMETERS IN FINES FLOCCULATION USING COFACTOR-POLYETHYLENE OXIDE RETENTION AID SYSTEM
Dr. Mohammad Raji Abdallah Qasaimeh*
ABSTRACT
In industrial applications confirmed with research work, the particles are wanted in some required specific properties; one is the particle size. In fines flocculation, the cofactor (CF)- polyethylene (PEO) dual system is essential and conventionally used. The fines comprise more than half the raw pulp. For this, we have investigated the effect of the shearing on the resulted flocs after flocculation. Results have shown that increases in the shear rate caused the floc size, the flocculation rate, and flocculation rate constant to decrease. In other hand, increases in shear rate enhanced deflocculation, causing the deflocculation rate, the deflocculation rate constant, and the reverse equilibrium rate constant to increase. For more, as with shear rate increase, the flocculation rate constant has decreased and deflocculation rate constant has increased, they approach each other and expected to be equal at a value of (0.4 s-1) , while reverse equilibrium rate constant equals to 1 when the shear rate approach 700 s-1. Since the flocs are easily affected by shearing, which changes the required flocs specifications, this study becomes important and as a guide to mills in the field and research.
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