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Reduction of bleach plant deposits yields better pulp, less downtime

Pulp & paper, 1994-09, Vol.68 (9), p.135

Copyright Miller Freeman Inc. Sep 1994 ;ISSN: 0033-4081 ;CODEN: PUPAA8

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  • Title:
    Reduction of bleach plant deposits yields better pulp, less downtime
  • Author: Ester, D.R
  • Subjects: BLANCHISSEMENT ; BLANQUEADURA ; BLEACHING ; CHEMICAL TREATMENT ; Chemicals ; DEPOSITION ; ELABORACION DE PULPA ; inorganic deposits ; Maintenance management ; Manufacturing ; organic deposits ; Paper industry ; PASTA ; PATE CELLULOSIQUE ; PULP ; PULPING ; Recommendations ; REDUCTION EN PATE ; WOOD PULP
  • Is Part Of: Pulp & paper, 1994-09, Vol.68 (9), p.135
  • Description: Deposition on bleach plant equipment can cost a mill lost production due to low production rates and downtime, loss of operational control, and dirt. There are 4 major components that deposit in the bleach plant, 3 of which are inorganic compounds - calcium carbonate, calcium oxalate, and barium sulfate. The 4th component is an organic compound called pitch. Anitscalants for inorganic deposits generally function via one or more of the following mechanisms: 1. chelation, 2. precipitation threshold inhibition, 3. dispersion, and 4. crystal distortion. Operating conditions that reduce the potential for pitch deposition include the following: 1. a good barking system, 2. white liquor settleable solids below 100 ppm, which reduces CaCO(3) entering the system, 3. treated freshwater showers that minimize calcium in the system, and 4. use of a digester additive that emulsifies resins in the digester and provides better brownstock washing.
  • Publisher: San Francisco: RISI, Inc
  • Language: English
  • Identifier: ISSN: 0033-4081
    CODEN: PUPAA8
  • Source: ProQuest Central
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