DE50012882D1 - Method for removing contaminants from an aqueous paper fiber suspension - Google Patents

Method for removing contaminants from an aqueous paper fiber suspension

Info

Publication number
DE50012882D1
DE50012882D1 DE50012882T DE50012882T DE50012882D1 DE 50012882 D1 DE50012882 D1 DE 50012882D1 DE 50012882 T DE50012882 T DE 50012882T DE 50012882 T DE50012882 T DE 50012882T DE 50012882 D1 DE50012882 D1 DE 50012882D1
Authority
DE
Germany
Prior art keywords
flotation
stage
suspension
downstream
cleaned
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
DE50012882T
Other languages
German (de)
Inventor
Herbert Holik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
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 Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Priority to DE50012882T priority Critical patent/DE50012882D1/en
Application granted granted Critical
Publication of DE50012882D1 publication Critical patent/DE50012882D1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1418—Flotation machines using centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/02—Froth-flotation processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1406—Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation

Landscapes

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

Abstract

Selective flotation stages (1,2) are used to separate foreign matter from a fiber suspension (S). The downstream flotation s (2) uses the residual air contained in the cleaned suspension flow (A1) from the first stage (1), without additional air to give bubbles for flotation. The second and downstream stage (2) acts as a flotation cyclone, with a centrifugal acceleration of the hydrocyclone of a v which is 5-200 times the rate of the spin of the earth, or 10-100 times. At the second and downstream flotation stage (2), the suspension from the first stage (1) is fed at a tangent into a cylinder. The flotation foam (R2) formed at the second stage (2) the cleaned suspension (A2) move out of the stage (2) at the axially opposite end to the inlet. The flotation foam (R2) is taken axially from the side of the second flotation stage (2) which also has the inflow, and the cleaned suspension (A2) is taken axia from the opposite side. The weaker force field used is the gravity of the earth. The cleaned suspension (A1) from the first flotation stage (1) is passed directly to the downstream flotation stage (2), without dwelling in a vat.
DE50012882T 1999-05-04 2000-04-08 Method for removing contaminants from an aqueous paper fiber suspension Expired - Fee Related DE50012882D1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE50012882T DE50012882D1 (en) 1999-05-04 2000-04-08 Method for removing contaminants from an aqueous paper fiber suspension

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19920480A DE19920480A1 (en) 1999-05-04 1999-05-04 Process for removing impurities from an aqueous paper fiber suspension
DE50012882T DE50012882D1 (en) 1999-05-04 2000-04-08 Method for removing contaminants from an aqueous paper fiber suspension

Publications (1)

Publication Number Publication Date
DE50012882D1 true DE50012882D1 (en) 2006-07-20

Family

ID=7906920

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19920480A Withdrawn DE19920480A1 (en) 1999-05-04 1999-05-04 Process for removing impurities from an aqueous paper fiber suspension
DE50012882T Expired - Fee Related DE50012882D1 (en) 1999-05-04 2000-04-08 Method for removing contaminants from an aqueous paper fiber suspension

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE19920480A Withdrawn DE19920480A1 (en) 1999-05-04 1999-05-04 Process for removing impurities from an aqueous paper fiber suspension

Country Status (3)

Country Link
EP (1) EP1050342B1 (en)
AT (1) ATE328667T1 (en)
DE (2) DE19920480A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004051327B4 (en) 2004-10-21 2007-09-27 Voith Patent Gmbh Method for degassing and feeding a pulp suspension to a headbox and degassing
EP1958697A4 (en) * 2005-12-07 2013-06-26 Taiheiyo Cement Corp Apparatus for removing of unburned carbon from fly ash and relevant removing method
GB2464318B (en) * 2008-10-11 2012-08-29 Screens At Work Ltd Improvements in and relating to furniture

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60134090A (en) * 1983-12-23 1985-07-17 森實　美津夫 Deinking method and apparatus of pulp
DE4206748A1 (en) * 1992-03-04 1993-09-09 Voith Gmbh J M Used paper recycling
DE4221028A1 (en) * 1992-03-04 1994-01-05 Voith Gmbh J M Used paper recycling
DE4224329C1 (en) * 1992-07-23 1993-11-11 Voith Gmbh J M Processing methods for waste paper
DE4426159A1 (en) * 1994-07-22 1994-12-08 Voith Gmbh J M Flotation device
DE19728393C2 (en) * 1997-07-03 1999-08-05 Voith Sulzer Stoffaufbereitung Process and plant for removing contaminants from an aqueous fiber suspension

Also Published As

Publication number Publication date
EP1050342A1 (en) 2000-11-08
DE19920480A1 (en) 2000-11-09
ATE328667T1 (en) 2006-06-15
EP1050342B1 (en) 2006-06-07

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Legal Events

Date Code Title Description
8327 Change in the person/name/address of the patent owner

Owner name: VOITH PATENT GMBH, 89522 HEIDENHEIM, DE

8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee