Deinking additives

This has historically involved only minimal use of chemical additives. The product is usually unsized and, because of its low cost, the use of polyelectrolytes for retention is not usually cost-effective. However, this situation is changing as a result of the trend towards limited filler inclusion and also the increased use of deinked waste paper. Newsprint is usually made in an acidic system due to the naturally low pH of groundwood pulp but, as more recycled fibre is used, the process may eventually become neutral. 

In addition to his scientific career, Karl-Erik founded a construction company and later cofounded the company Enzymatic Deinking Technologies (EDT) to exploit technology developed in his laboratory. After returning to Sweden, he became the board chairman of SweTree Genomics AB. He also served on the boards of directors of several additional companies. 

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 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.]... 

As just mentioned, the addition of the proper surfactant to a dispersion can produce a situation in which the solid particles, having a specific gravity much greater that that of water, can be made to float to the top and be easily (relatively speaking) separated from the aqueous phase. In the deinking mentioned above, there is no particular interest in being selective with respect to what is removed. It is essentially an all out proposition. In the mining industry the situation is quite different. 

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