Retention of Pretreated Calcium Carbonate with a PEO/Cofactor/Fixative System, 2003 Spring Technical Conference Proceedings

This work investigates the retention of pretreated precipitated calcium carbonate (PCC) in thermo-mechanical pulp suspensions using polyethylene oxide (PEO) and phenol formaldehyde resin (PFR) as the cofactor (CF) in conjunction with two starch-based coagulants or fixatives. At a PEO/PFR dosage of 0.05/0.05 mg/g of OD pulp the coagulant enhanced the retention but the result was the opposite at a PEO/PFR dosage of 0.15/0.15 mg/g. However, the overall effect of the fixative on the PCC and fiber fines retention was negative as it was concluded from the analysis of the statistically designed experiments. The flocs formed with PEO/PFR in the presence of coagulants were found to be stronger than those formed with PEO/PFR only. Finally, aggregation experiments, cationic demand and zeta potential measurements were also carried out to aid in the interpretation of the observed behaviour.

Author: Modgi, S. B., Thorburn, I., Englezos, P.
Retention of Pretreated Calcium Carbonate with a PEO/Cofacto
Retention of Pretreated Calcium Carbonate with a PEO/Cofactor/Fixative System, 2003 Spring Technical Conference Proceedings
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