Deinking of waste paper
Deinking of waste paper is obtained with the use of a hydrophobic kaolin-based deinking composition. The hydrophobic kaolin-based deinking composition is produced by hydrophobizing the kaolin clay and then blending the hydrophobic kaolin-based particles with a deinking surfactant. Separation and removal of ink is achieved either by washing deinking, flotation deinking or combination of these methods.
1. A composition for deinking waste paper, wherein the composition comprises:
A. a non-ionic polyalkylene oxide based surfactant and
B. a hydrophobic kaolin-based deinking component, wherein the composition improves the brightness of deinked waste paper.
2. A composition for improving the brightness of deinked waste paper, wherein the composition is produced by a process which comprises:
(1) forming a slurry of dispersed kaolin clay particles;
(2) treating the dispersed kaolin clay particles with a hydrophobizing reagent;
(3) separating the hydrophobic kaolin-based particles from the non-hydrophobic kaolin-based particles; and
(4) adding a non-ionic polyalkylene oxide based surfactant to the hydrophobic kaolin-based particles.