SIMPLIFIED
“FLOTATION
DE-‐INKING”
OF
NEWSPAPER
NAUMAN
MITHANI
(CHEM
317
-‐
2010
SPRING)
1
PURPOSE
• de-‐ink
newspaper
as
per
the
technique
of
flota%on
de-‐inking
• •
scaled
down
&
adapted
for
lab
environment
improvised
equipment focus
on
op#misa#on
of
variables:
✓ ✓
duraAon
of
flotaAon concentraAon
of
flotaAon
agent temperature consistency
(cs.
%)
2
if
possible
-‐ -‐
facts BACKGROUND:
paper
•
paper,
a
ubiquitous
material
•
a
disposable
material
recovered un-recovered
•
33%
to
50%
of
solid
municipal
waste*
➡
100 paper (million tonnes) 75 50 25 0
50
4.5 50
a
crucial
parameter
in
the
long-‐term
environmental
sustainability
of
a
large
populaXon
centre
✤
so
it
must
be
recycled,
which
in
turn
consumes...
✤ ✤
water electricity
✤
13.5
&
other
(environmental)
resources
USA (2004) Canada (2006)
✤
sustainability
&
expansion
if:
✤
high
performance
&
high
quality
of
recycled
paper
3
*
Nie et al. Environmental Engineering and Policy (1998) vol. 1 (1) pp. 47-58
INTRO:
chemical
composiXon
of
paper
•
Paper,
essenXally,
is
a
felted
sheet
of
cellulose
fibres
•
actually,
it
is
a
complex
mixture
of
chemical
addiXves,
fillers,
bonding
agents
(upto
~40
%
weight)
•
Cellulose:
(C6H10O5)n
•
bears
a
surfeit
of
O-‐
and
OH
groups
network
of
H-‐bonds
• •
highly...