Abstract:
The aim of this work is to investigate between flotation and washing deinking processes in
order to use recycled pulps as a new resource for electrical purposed paper. The operating
variables were pulp consistency, time in flotation cell and type and concentration of surfactant.
The surfactants used in this work were cationic surfactant (CTAB, Cetyltrimethylammonium
Bromide) anionic surfactant (SDS, Sodium Dodecyl Sulfate) and non-ionic surfactant (TX-100,
Octyl Phenol Ethoxylate). The experimental results revealed that flotation process was more
efficient in deinking than washing process. The non-ionic surfactant provided (TX-100) the most
efficient in ink removal. The surfactant concentration near CMC value provided low ink specs,
high brightness and strength on tested handsheets. The optimum condition for flotation deinking
is 0.9% o.d. wt. of TX-100 and 10 min flotation time. Paper modification by castor oil dipping
provided the highest dielectric constant of tested paper that is suitable to use as electrical
purposed paper.