Effect of carboxymethylcellulose and starch depressants on recovery of filler and fines in tertiary flotation

Author:

ÄMMÄLÄ ARI,MÄKINEN LIISA,LIIMATAINEN HENRIKKI,NIINIMÄKI JOUKO

Abstract

Yield loss in state-of-art deinking processes for newsprint is usually 15%–20%. Economic and environmental concerns associated with reject handling point to a need to improve yield. This paper describes a study conducted to determine whether it is possible to recover fillers and fiber fines from flotation froth reject of an old newsprint/old magazine processing mill by refloating froth with and without the use of depressants. The recovery of approximately 10%–15% of material was observed without the use of additional flotation chemicals in the reflotation stage. Carboxymethylcellulose (CMC) was observed to be a functional depressant that enhanced fiber fines recovery in particular and, to some extent, china clay recovery but lowered calcium carbonate recovery. The recovery increased to 20%–30% with a dosage of approximately 1 kg CMC/ton of pulp. In addition, starch had a depressing effect, but this effect was weaker than that of CMC, even with much higher dosages.

Publisher

TAPPI

Subject

Mechanical Engineering,General Materials Science,Media Technology,General Chemical Engineering,General Chemistry

Reference23 articles.

1. Hamm, U., in Papermaking Science and Technology 7: Recycled Fibre and Deinking (U. Höke, and S. Schabel, Eds.), 2nd edn., Finnish Paper Engineers’ Association, Helsinki, 2010, p. 562.

2. Mäkinen, L., Körkkö, M., Ämmälä, A., et al., TAPPI Pulping, Eng., Environ. Recycl. Sustainability (PEERS) Conf., TAPPI PRESS, Atlanta, 2011, p. 381.

3. Süss, H.U., Kronis, J.D., Nimmerfroh, N.F., et al., Pulping Conf., TAPPI PRESS, Atlanta, 1994, p. 1025.

4. Wills, B.A., Mineral Processing Technology, 5th edn., Pergamon Press, Oxford, 1992.

5. Shaw, D.R., US Patent 5,011,596 (Sept. 19, 1991).

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