Deinking flotation

Wash deinking often used for flexo-printed waste and in older tissue mills, large water consumption. Flotation deinking for oil-based printings such as offset and rotogravure, technology from the mining industry. 

Figure 2 Schematic draw on a two loop flotation deinking process...

Cellulase is added during pulping or flotation deinking. The enzyme increases the amount of ink removed from the fibers, thereby increasing the cleanliness of the sheet. This results in a brighter, cleaner sheet, or alternatively a reduction in the use of surfactants and bleaching chemicals. 

In some flotation deinking, calcium chloride is used with a long-chain fatty acid to make the ink particles hydrophobic.31... 

Rutland, M. and Pugh, R. J., Calcium soaps in flotation deinking - fundamental studies using surface force and coagulation techniques. Colloid Surf, A, 125, 33-46 (1997). 

The effiuent/white water quality has to be controlled very exactly. COD increases with increasing pH. For flotation deinking of recovered paper the total chemical costs have a relatively high proportion of 15-20% of the overall DIP production costs. Yield rates up to 93 % for newsprint production are attainable. 

T.P. Eriksson, M.A. McCool, A review of flotation deinking cell technology. Paper Recycling Challenge, Yo. II, Doshi, Appleton, USA, 1997, p.69. 

Rejects and sludges Heavy-weight and coarse Light-weight and fine Flotation deinking White water clarification... 

McKinney, R. (1998). Flotation deinking overview, in Paper Recycling Challenge, Vol. m. Process Technology, M. R. Doshi and J. M. Dyer, eds., Doshi Associates, Appleton, WI, pp. 99-114. 

Ultrafine particle size platy talcs have been used extensively as recycling additives. The highly adsorbant talcs attract inks, adhesives and other organics that may be part of the recycled stock. Talcs also function in flotation deinking processes as foam stabilizers, and since talc tends to float on water, it helps to carry the ink particles to the surface. The talc-waste particles are large enough to be easily removed by filtration or other cleaning methods. 

Uses Flotation deinking surfactant for wood-free and newsprint paper dispersant-collector for flotation deinking of waste paper Floatsan 210 [BASF]... 

Uses Flotation deinking surfactant for paper Features Rec. for systems requiring a reduced level of foam generation Floe Aid 19 [Alco]... 

Uses Flotation deinking agent pulp/paper surfactant, esp. for combination wash/ flotation... 

Uses Additive used in flotation deinking of wood-free waste paper Features Particularly effective for combination deinking (wash/flotation works well when hardness is low Berocell Displector 5024 [Eka Chems.]... 

Uses Flotation deinking agent esp. effective on flexographic ink pulp/paper surfactant post flotation collector for acid loops Properties Liq. water-sol. 

Uses Flotation deinking agent pulp/paper surfactant... 

Uses Surfactant-based prod, for superior flotation deinking otters high brightness and high fiber yield... 

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