SE9604733D0 - Procedure for preventing calcium oxalate precipitation - Google Patents

Procedure for preventing calcium oxalate precipitation

Info

Publication number
SE9604733D0
SE9604733D0 SE9604733A SE9604733A SE9604733D0 SE 9604733 D0 SE9604733 D0 SE 9604733D0 SE 9604733 A SE9604733 A SE 9604733A SE 9604733 A SE9604733 A SE 9604733A SE 9604733 D0 SE9604733 D0 SE 9604733D0
Authority
SE
Sweden
Prior art keywords
added
calcium oxalate
bleaching
process flow
procedure
Prior art date
Application number
SE9604733A
Other languages
Swedish (sv)
Other versions
SE9604733L (en
SE514319C2 (en
Inventor
Torbjoern Joensson
Rune Raadstroem
Per Tomani
Per Ulmgren
Original Assignee
Svenska Traeforskningsinst
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 Svenska Traeforskningsinst filed Critical Svenska Traeforskningsinst
Priority to SE9604733A priority Critical patent/SE514319C2/en
Publication of SE9604733D0 publication Critical patent/SE9604733D0/en
Publication of SE9604733L publication Critical patent/SE9604733L/en
Publication of SE514319C2 publication Critical patent/SE514319C2/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
    • D21C9/10—Bleaching ; Apparatus therefor

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

The magnesium ions are added to the process flow in a quantity sufficient for prevention of precipitation of calcium oxalate under ruling conditions. The amount of magnesium added is within the range of \=0.5 to \=5 kg per ton of pulp. The magnesium is added to a process flow the pH of which is in the range of \=pH 2 to \=pH 9, suitably \=pH 3 to \=pH 7 and most suitable \=pH 5. The process flow is one involving oxidative bleaching of the paper pulp, or where a complex former is added to the pulp. Where oxidative bleaching is used, the bleaching filtrate from a washing stage is at least partly fed back to earlier process stages. Where a complex former is added, the bleaching filtrate is also fed back from a washing stage at least partly to earlier process stages.
SE9604733A 1996-12-20 1996-12-20 Method for preventing calcium oxalate precipitation during production of paper pulp SE514319C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9604733A SE514319C2 (en) 1996-12-20 1996-12-20 Method for preventing calcium oxalate precipitation during production of paper pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9604733A SE514319C2 (en) 1996-12-20 1996-12-20 Method for preventing calcium oxalate precipitation during production of paper pulp

Publications (3)

Publication Number Publication Date
SE9604733D0 true SE9604733D0 (en) 1996-12-20
SE9604733L SE9604733L (en) 1998-06-21
SE514319C2 SE514319C2 (en) 2001-02-12

Family

ID=20405091

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9604733A SE514319C2 (en) 1996-12-20 1996-12-20 Method for preventing calcium oxalate precipitation during production of paper pulp

Country Status (1)

Country Link
SE (1) SE514319C2 (en)

Also Published As

Publication number Publication date
SE9604733L (en) 1998-06-21
SE514319C2 (en) 2001-02-12

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Legal Events

Date Code Title Description
NUG Patent has lapsed