SE9701778L - Procedure for Minimizing Calcium Caused Incrustation Problems in Preparation of Bleached Cellulose Pulp - Google Patents

Procedure for Minimizing Calcium Caused Incrustation Problems in Preparation of Bleached Cellulose Pulp

Info

Publication number
SE9701778L
SE9701778L SE9701778A SE9701778A SE9701778L SE 9701778 L SE9701778 L SE 9701778L SE 9701778 A SE9701778 A SE 9701778A SE 9701778 A SE9701778 A SE 9701778A SE 9701778 L SE9701778 L SE 9701778L
Authority
SE
Sweden
Prior art keywords
cellulose pulp
suspension
liquid
washing
neutral
Prior art date
Application number
SE9701778A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE509444C2 (en
SE9701778D0 (en
Inventor
Jan Liden
Staffan Magnusson
Original Assignee
Mo Och Domsjoe Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mo Och Domsjoe Ab filed Critical Mo Och Domsjoe Ab
Priority to SE9701778A priority Critical patent/SE509444C2/en
Publication of SE9701778D0 publication Critical patent/SE9701778D0/en
Priority to AU74639/98A priority patent/AU7463998A/en
Priority to PCT/SE1998/000879 priority patent/WO1998051855A1/en
Publication of SE9701778L publication Critical patent/SE9701778L/en
Publication of SE509444C2 publication Critical patent/SE509444C2/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • D21C11/0028—Effluents derived from the washing or bleaching plants
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/008—Prevention of corrosion or formation of deposits on pulp-treating equipment
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Abstract

Scaling problems in, for instance, washing apparatus occur when using fully closed liquid flow patterns in the manufacture of bleached cellulose pulp. The present invention provides a solution to this problem, and relates to a method for minimizing calcium caused scaling problems when washing and/or increasing the consistency of cellulose pulp suspensions and in other cellulose pulp suspension processes where the pulp suspension is treated in at least two stages, including at least one bleaching stage, alternately in a neutral/acidic and alkaline environment, wherein washing liquid (suspension liquid) is passed counter-currently such that the treatment process will be essentially fully closed with respect to the washing liquid (suspension liquid) flow pattern, characterized in that the major part of the calcium present in and on cellulose pulp fibres incoming to the treatment process is prevented from being released in the suspension liquid, by adding a water soluble, oxalate-containing chemical to the suspension liquid downstream of the neutral/acidic treatment stage and/or to the pulp suspension immediately prior to or in the neutral/acidic treatment stage.
SE9701778A 1997-05-14 1997-05-14 Procedure for Minimizing Calcium Caused Incrustation Problems in Preparation of Bleached Cellulose Pulp SE509444C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9701778A SE509444C2 (en) 1997-05-14 1997-05-14 Procedure for Minimizing Calcium Caused Incrustation Problems in Preparation of Bleached Cellulose Pulp
AU74639/98A AU7463998A (en) 1997-05-14 1998-05-12 Method of minimizing scaling problems in the manufacture of bleached cellulose pulp while using an essentially fully closed washing liquid flow pattern
PCT/SE1998/000879 WO1998051855A1 (en) 1997-05-14 1998-05-12 Method of minimizing scaling problems in the manufacture of bleached cellulose pulp while using an essentially fully closed washing liquid flow pattern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9701778A SE509444C2 (en) 1997-05-14 1997-05-14 Procedure for Minimizing Calcium Caused Incrustation Problems in Preparation of Bleached Cellulose Pulp

Publications (3)

Publication Number Publication Date
SE9701778D0 SE9701778D0 (en) 1997-05-14
SE9701778L true SE9701778L (en) 1998-11-15
SE509444C2 SE509444C2 (en) 1999-01-25

Family

ID=20406921

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9701778A SE509444C2 (en) 1997-05-14 1997-05-14 Procedure for Minimizing Calcium Caused Incrustation Problems in Preparation of Bleached Cellulose Pulp

Country Status (3)

Country Link
AU (1) AU7463998A (en)
SE (1) SE509444C2 (en)
WO (1) WO1998051855A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6605350B1 (en) 1996-08-23 2003-08-12 Weyerhaeuser Company Sawdust alkaline pulp having low average degree of polymerization values and method of producing the same
SE521780C2 (en) * 2003-01-31 2003-12-09 Kvaerner Pulping Tech Method for bleaching cellulose pulp and bleaching line for this
ES2729110T3 (en) * 2011-09-05 2019-10-30 Stora Enso Oyj Process for treating black hardwood liquor and black hardwood liquor treated according to the process
FI126563B (en) * 2012-03-12 2017-02-15 Upm Kymmene Corp Method and apparatus for treating fluid streams in a cellulose plant

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5554259A (en) * 1993-10-01 1996-09-10 Union Camp Patent Holdings, Inc. Reduction of salt scale precipitation by control of process stream Ph and salt concentration
SE9501623L (en) * 1995-05-02 1996-11-03 Sunds Defibrator Ind Ab Bleaching of pulp
SE9503004L (en) * 1995-08-30 1997-03-01 Sunds Defibrator Ind Ab Bleaching of pulp

Also Published As

Publication number Publication date
SE509444C2 (en) 1999-01-25
WO1998051855A1 (en) 1998-11-19
SE9701778D0 (en) 1997-05-14
AU7463998A (en) 1998-12-08

Similar Documents

Publication Publication Date Title
FI960214A (en) Method and apparatus for treating pulp
ATE175250T1 (en) TREATMENT OF BLEACH PLANT WASTEWATER
FI954093A (en) Method for treating pulp with non-chlorine chemicals
PT734470E (en) PROCESS FOR THE MANUFACTURE OF BRANCHED CELLULOSE PASTE
SE9701778L (en) Procedure for Minimizing Calcium Caused Incrustation Problems in Preparation of Bleached Cellulose Pulp
DE69709656D1 (en) METHOD FOR BLEACHING PAPER FIBER
CN104169493B (en) A kind of method and system processing liquid flow in chemical pulp mills
FI89814B (en) FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA
US5741398A (en) Method of removing metal ions dissolved in the bleach plant waste water
CA2090338A1 (en) Process for treatment of lignocellulosic pulp and apparatus for performance of the process
SE9501897L (en) Process for delignification / bleaching of lignin-containing cellulose pulp
FI127859B (en) Method and system for reducing phosphorus in effluent or filtrate
JP2001009465A (en) Treatment of papermaking wastewater
EP3126295B1 (en) Method for reducing phosphorus in effluent or filtrate
SU1612020A1 (en) Method of bleaching pulp
SE9600977L (en) Use of filtrates from acid treatment steps in the preparation of cooking liquor
FI127631B (en) Method for reducing phosphorus in a wastewater from a process
JPH0778316B2 (en) Improved cleaning method
RU2123552C1 (en) Method of bleaching cellulose
CA2229212A1 (en) Treatment of pulp with chelating agent in at least two mixing steps without intermediate washing
SE9303644L (en) Method of separating metal ions from pulp in connection with bleaching of the pulp
JP2000015267A (en) Treatment of wastewater from paper manufacturing
SE9800797L (en) Preparation of pulp
KR970011154A (en) How to color your camel hair and yak hair

Legal Events

Date Code Title Description
NUG Patent has lapsed