The Present Condition of Filtrating and a Future Plan of BKP Process

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Other Title
  • ＢＫＰ水廻しの現状と今後の計画
  • BKPミズマワシ ノ ゲンジョウ ト コンゴ ノ ケイカク

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Abstract

Nomachi mill has 2 continuous cooking lines for Softwood (N) Pulp or Hardwood (L) Pulp respectively, and each process has individual bleaching system as well. As far as N pulp is concerned we produce both high Kappa-No. pulp for Kraft paper and low Kappa-No. pulp for bleached pulp base paper.<BR>This time, from the viewpoint of water-savings, I take up the washing flow of bleaching process as an example of BKP Filtrating.<BR>We use Drum Filters as the washer of bleaching line for both N and L. As for bleaching sequence we adopt the conventional one, that is to say L is C⁄D-E⁄O-H-D and N is C-Ep-H-D. And we appropriate the filtrate of the last stage (H & D) to the shower of the fist stage effectively.<BR>I explain such a present condition of washing flow and the point of improvement after strengthening the H 2O2 Bleaching line for N pulp, and also introduce the plan of ECF for N pulp that is to be changed from the conventional bleaching process this April.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 58 (7), 892-894, 2004

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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