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FI972954L - Method for treating waste liquor generated in the production of sulphate pulp - Google Patents

Method for treating waste liquor generated in the production of sulphate pulp Download PDF

Info

Publication number
FI972954L
FI972954L FI972954A FI972954A FI972954L FI 972954 L FI972954 L FI 972954L FI 972954 A FI972954 A FI 972954A FI 972954 A FI972954 A FI 972954A FI 972954 L FI972954 L FI 972954L
Authority
FI
Finland
Prior art keywords
calcium
production
waste liquor
treating waste
sulphate pulp
Prior art date
Application number
FI972954A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI972954A7 (en
FI972954A0 (en
Inventor
Jukka Vaistomaa
Original Assignee
Sunds Defibrator Pori Oy
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 Sunds Defibrator Pori Oy filed Critical Sunds Defibrator Pori Oy
Priority to FI972954A priority Critical patent/FI972954L/en
Publication of FI972954A0 publication Critical patent/FI972954A0/en
Priority to PCT/FI1998/000580 priority patent/WO1999002771A1/en
Publication of FI972954A7 publication Critical patent/FI972954A7/en
Publication of FI972954L publication Critical patent/FI972954L/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
    • D21C9/1015—Bleaching ; Apparatus therefor with use of means other than pressure, temperature
    • 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
    • D21C11/04—Regeneration of pulp liquors or effluent waste waters of alkali lye

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

When pulp is manufactured by so-called modified cooking methods, spent liquor is formed containing large amounts of calcium bound to the dissolved material. During evaporation calcium is liberated and precipitates on the heat transfer surfaces of the evaporating plant. By means of the method according to the invention the precipitation of calcium is either moved to a stage in the evaporating process where it co-precipitates with sodium salts, whereby the precipitate is easily dissolved, or the calcium is deactivated prior to the evaporating plant by allowing it to precipitate at a stage where no scaling can be formed on heat transfer surfaces.
FI972954A 1997-07-11 1997-07-11 Method for treating waste liquor generated in the production of sulphate pulp FI972954L (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FI972954A FI972954L (en) 1997-07-11 1997-07-11 Method for treating waste liquor generated in the production of sulphate pulp
PCT/FI1998/000580 WO1999002771A1 (en) 1997-07-11 1998-07-09 Method for the treatment of spent liquor from kraft pulp production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI972954A FI972954L (en) 1997-07-11 1997-07-11 Method for treating waste liquor generated in the production of sulphate pulp

Publications (3)

Publication Number Publication Date
FI972954A0 FI972954A0 (en) 1997-07-11
FI972954A7 FI972954A7 (en) 1999-01-12
FI972954L true FI972954L (en) 1999-01-12

Family

ID=8549240

Family Applications (1)

Application Number Title Priority Date Filing Date
FI972954A FI972954L (en) 1997-07-11 1997-07-11 Method for treating waste liquor generated in the production of sulphate pulp

Country Status (2)

Country Link
FI (1) FI972954L (en)
WO (1) WO1999002771A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI981803A7 (en) * 1998-08-21 2000-02-22 Andritz Oy Method for preventing the formation of precipitates
FI110327B (en) * 1999-10-04 2002-12-31 Metso Chemical Pulping Oy Process for preparing cellulose pulp
SE524247C2 (en) * 2002-11-25 2004-07-13 Kvaerner Pulping Tech Method for production of green liquor
SE0602476L (en) * 2006-11-22 2007-08-21 Metso Fiber Karlstad Ab Method for recovering heat energy from black liquor
EP2753750B1 (en) * 2011-09-05 2019-03-06 Stora Enso Oyj Process for treating hardwood black liquor and hardwood black liquor treated according to the process

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE153753C1 (en) *
US3951753A (en) * 1969-06-03 1976-04-20 Roller Paul S Method and apparatus for the conversion of an aqueous scale-formed liquid
US3873415A (en) * 1973-05-03 1975-03-25 Spring Chemicals Ltd Process for reducing the amount of calcium contained in sodium-base waste sulfite liquor by the use of a sodium and/or an ammonium compound and additional calcium
SE8502807D0 (en) * 1985-06-06 1985-06-06 Ahlstroem Foeretagen SET AND DEVICE DISABLE DEVICE
CA1299322C (en) * 1987-10-26 1992-04-28 Larry A. Wilhelmsen Apparatus and methods for reducing the formation of scale in pulping operations
FI96786B (en) * 1994-10-24 1996-05-15 Tampella Power Oy A method for reducing fouling of the thermal surfaces of a sulphate pulp mill evaporator

Also Published As

Publication number Publication date
FI972954A7 (en) 1999-01-12
FI972954A0 (en) 1997-07-11
WO1999002771A1 (en) 1999-01-21

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