SE0001037L - Purification of the bleaching filtrate before returning to the bleaching process - Google Patents

Purification of the bleaching filtrate before returning to the bleaching process

Info

Publication number
SE0001037L
SE0001037L SE0001037A SE0001037A SE0001037L SE 0001037 L SE0001037 L SE 0001037L SE 0001037 A SE0001037 A SE 0001037A SE 0001037 A SE0001037 A SE 0001037A SE 0001037 L SE0001037 L SE 0001037L
Authority
SE
Sweden
Prior art keywords
filtrate
bleaching
aluminium
recirculated
magnesium
Prior art date
Application number
SE0001037A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE0001037D0 (en
SE516037C2 (en
Inventor
Christos Rampotas
Original Assignee
Kemira Kemi 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 Kemira Kemi Ab filed Critical Kemira Kemi Ab
Priority to SE0001037A priority Critical patent/SE516037C2/en
Publication of SE0001037D0 publication Critical patent/SE0001037D0/en
Priority to AU2001232590A priority patent/AU2001232590A1/en
Priority to PCT/SE2001/000318 priority patent/WO2001073195A1/en
Publication of SE0001037L publication Critical patent/SE0001037L/en
Publication of SE516037C2 publication Critical patent/SE516037C2/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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
    • 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
    • D21C9/1026—Other features in bleaching processes
    • 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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)

Abstract

A method in bleaching of pulp is described, in which the pulp is washed in connection with the bleaching and the washing liquid from the washing is separated from the pulp in the form of a filtrate, which is treated with an aluminium compound for precipitation of interfering substances, whereupon the precipitated material is removed from the purified filtrate, which is recirculated to the bleaching process. The method is characterised in that the purified filtrate, before being recirculated to the bleaching process, is treated by adding a magnesium compound, such as magnesium oxide, and adjusting the pH of the purified filtrate to above 7, preferably to 8.5-11, for precipitation of an aluminium-containing precipitate, which is removed, whereupon the remaining filtrate is recirculated to the bleaching process, preferably to a peroxide bleaching step. By this treatment the aluminium content of the filtrate can be further reduced, resulting in aluminium content levels of less than 5ppm. When recirculating the filtrate to a peroxide bleaching step, an advantageous supply of magnesium in combination with aluminium, preferably in the form of hydrotalcite, to the peroxide bleaching step is achieved owing to the fact that the recirculated filtrate contains small amounts of magnesium and aluminium, and preferably also carbonate.
SE0001037A 2000-03-24 2000-03-24 Purification of the bleaching filtrate before returning to the bleaching process SE516037C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE0001037A SE516037C2 (en) 2000-03-24 2000-03-24 Purification of the bleaching filtrate before returning to the bleaching process
AU2001232590A AU2001232590A1 (en) 2000-03-24 2001-02-15 Treatment of bleach plant filtrates
PCT/SE2001/000318 WO2001073195A1 (en) 2000-03-24 2001-02-15 Treatment of bleach plant filtrates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0001037A SE516037C2 (en) 2000-03-24 2000-03-24 Purification of the bleaching filtrate before returning to the bleaching process

Publications (3)

Publication Number Publication Date
SE0001037D0 SE0001037D0 (en) 2000-03-24
SE0001037L true SE0001037L (en) 2001-09-25
SE516037C2 SE516037C2 (en) 2001-11-12

Family

ID=20278990

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0001037A SE516037C2 (en) 2000-03-24 2000-03-24 Purification of the bleaching filtrate before returning to the bleaching process

Country Status (3)

Country Link
AU (1) AU2001232590A1 (en)
SE (1) SE516037C2 (en)
WO (1) WO2001073195A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007022752A1 (en) * 2007-05-11 2008-11-13 Voith Patent Gmbh Lignocellulose primary fiber whitening method , involves whitening primary fibers in one stage with peroxide and in another stage with formamidine sulfininc acid, and using filtrate of peroxide stage for whitening fibers in final stage
AU2021274310A1 (en) * 2020-05-22 2022-12-22 Suzano S.A. Methods of treating a kraft process recovery cicle to reduce metal levels at the kraft process

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2159560A5 (en) * 1971-11-03 1973-06-22 Degremont
EP0564443A1 (en) * 1992-03-15 1993-10-06 Kamyr, Inc. Treatment of bleach plant filtrates
SE513460C2 (en) * 1998-04-08 2000-09-18 Kemira Kemi Ab Treatment of filtrate in peroxide bleaching of pulp

Also Published As

Publication number Publication date
WO2001073195A1 (en) 2001-10-04
SE0001037D0 (en) 2000-03-24
AU2001232590A1 (en) 2001-10-08
SE516037C2 (en) 2001-11-12

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Legal Events

Date Code Title Description
NUG Patent has lapsed