I faintly remember a method with dirty bubbles.
Blow air into the watery pulp and scoop the
bubbles at the surface.
Other ideas:
http://www.technologyreview.com/news/427209/laser-erasers-gently-remove-ink-from-paper/
http://phys.org/news/2012-03-toshiba-printer-erasable-toner.html
http://www.lcmp.eng.cam.ac.uk/wellmade/un-photocopying
http://www.newscientist.com/article/dn4451-disappearing-ink-to-boost-paper-recycling.html
Regards,
Joachim
This can be done in either 2 steps or a single step of pulping-deinking. Adding the following chemicals together with air bubbles can improve deinking:
- Sodium hydroxide, NaOH - improve fibre swelling and ink detachment
- Sodium silicate, Na2SiO3 - assist ink dispersion
- Alum or CaCl2 - assist frothing and flocculation of ink particles
Carrying out the pulping at elevated temperatures also improves deinking
Dear Sharmiza,
Thank you so much for answer
how can i deink pulp without air bubbles? is it possible?
The air bubbles are meant to float the ink particles which agglomerate to the surface for easy removal. This is very useful for deinking at large scale. For smaller scale deinking, you can just use a mixer/ disintegrator which will also introduce air bubbles. After deinking, the separated ink particles can be easily washed off from the pulp.
Sharmiza has identified the key process steps. You can learn a lot more at TAPPI (Technical Association of the Pulp & Paper Industry) - www.tappi.org They have a large data base which has many technical papers on the subject - free access for members and fees for downloading papers for nonmembers. The most cost effective is to join TAPPI - $174/year.
You are welcome Saman Ghahri. My phd thesis about deinking. So you can ask me about this topic :)
Hello dear Saman;
I have checked my database and maybe the enclosed 2 papers could be useful for you.
Also please check the below link which it could be interesting:
http://www.adirondackmachine.com/flotationcell.html
Best regards,
Hamed
Dear Mustafa, do you have any experience about occ fiber? i want to dry and use them in board manufacturing.
A part of my study is about OCC. But i am gonna use them for recycle. I heard that some researchers have used OCC for producing fiberboards
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