METHOD FOR DEINKING AND OTHER CONTAMINENT REMOVAL FROM WASTEPAPER

摘要

Hydrophobic contaminants are removed from repulped waste paper by preserving the hydrophobicity employing a minimum of reagent chemicals if any and a minimum of residence time of repulped waste paper in water. Dry repulping is used and optionally using dry screening (25) and optionally storing the repulped paper for rapid dilution and flotation type separation. A hydrocyclone flotation separator's process is disclosed by which the repulped and diluted paper slurry is applied to an inlet of a reverse type hydrocyclone (35), and air rich rejects portion (40) is removed at the rejects outlet of the hydrocyclone along with hydrophobic contaminants. The residence time following dilution may be as low as five seconds to preserve hydrophobicity.