Bentonite
11
Paper The Ciba ® HYDROCOL ® System Newsprint & Mechanical Specialties
-
Upload
sakuragi-muci -
Category
Documents
-
view
77 -
download
3
Transcript of Bentonite
Paper
The Ciba® HYDROCOL® System
Newsprint & Mechanical Specialties
Paper
The Ciba® HYDROCOL® System
+++++++ ++ ++++++++++++
Cationic Polymer
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -
Bentonite Clay
U.S. Patent No. 4,753,710 - June 1988
Paper
Bentonite - A Closer Look
Negative surface charge - Positive edge charge
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -
300 nm
100 nm0.9 nm
Swells in water - increases surface area to
700-800 m2/g
Paper
Bentonite Interactions
++++++ ++ ++++++++++++
Polyamines, PAC,PolyDADMACs,
Alum
Cationic Starch
++++++ ++ ++++++++++++
Cationic Flocculants
+ + ++++++
++
+++++++
- --
----
-
---- -
---
-- --
-- -- -
Bentonite
Paper
Bentonite InteractionsPitch, Ink
Dissolved Solids
Contaminants, Stickies, Oils
- ------- -- -- -
- --
---
-
-
-----
- -
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -
Bentonite
Paper
200
100
25
250
0
50
100
150
200
250
300
Fatty Acid Triglyceride
Pitch Type
PitchAdsorbed(u moles)
Bentonite Talc
Pitch Adsorption - Bentonite & Talc
Paper
Ciba® HYDROCOL® Addition Points
HeadboxScreens
Fan Pump
Percol Polymer
Hydrocol Pigment
(bentonite)
Paper
Ciba® HYDROCOL® Mechanism
++++++ ++ ++++++++++++
Cationic Polymer
Fibers, fines & filler++++++ ++ ++++++++++++ +
+++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++ ++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
High Shear
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++ ++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++ +++
+++++ ++ ++++++++++ ++
Bentonite
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -+
+++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ ++++++++++++
++++++ ++ +++++++++++++
+++++ ++ ++++++++++++
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -
++
++++++++
- --
----
-
---- -
---
-- --
-- -- -
Structured Floc
Paper
Particle Sizes in the Wet End
Length (microns) Width (microns)
Hardwood Fiber 1000-1800 10-35
Softwood Fiber 3000-5000 25-40
Fiber Fine 10-70 10-40
Filler Clay 2-5 0.2
Pitch Particle ~0.7 ~0.7
Bentonite 0.3-0.5 ~0.001
Polymer Molecule ~40 uncoiled ~0.001
Paper
Ciba® HYDROCOL® Control Strategy
Polymer addition– Control of white water solids
– Control drainage
Bentonite addition– Stabilize drainage
– Conductivity & dissolved solids driven
Paper
Ciba® HYDROCOL® Benefits
Increased production Increased retention Increased drainage Improved wet end stability Improved machine cleanliness Improved additive efficiency Handles “dirty” & “variable” wet end
conditions
