EP0146565A1 - Procede et dispositif de separation de particules mouillables et non mouillables - Google Patents

Procede et dispositif de separation de particules mouillables et non mouillables

Info

Publication number
EP0146565A1
EP0146565A1 EP19840901904 EP84901904A EP0146565A1 EP 0146565 A1 EP0146565 A1 EP 0146565A1 EP 19840901904 EP19840901904 EP 19840901904 EP 84901904 A EP84901904 A EP 84901904A EP 0146565 A1 EP0146565 A1 EP 0146565A1
Authority
EP
European Patent Office
Prior art keywords
particles
film
corner
skirt
slurry
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.)
Withdrawn
Application number
EP19840901904
Other languages
German (de)
English (en)
Inventor
John H. Klungness
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0146565A1 publication Critical patent/EP0146565A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/026—Separating fibrous materials from waste
    • 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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • 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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/68—Washing granular, powdered or lumpy materials; Wet separating by water impulse
    • B03B5/70—Washing granular, powdered or lumpy materials; Wet separating by water impulse on tables or strakes
    • B03B5/72—Washing granular, powdered or lumpy materials; Wet separating by water impulse on tables or strakes which are movable
    • B03B5/74—Revolving tables

Definitions

  • a continuously curved spinning disk has been used for separating fibres according to size and for removing non-fibrous materials, such as sand, from the fibre slurry, but removal of fibres contaminated by the stickies is apparently not accomplished. See Moller et al, Tappi Vol. 63, No. 9 pps 89 to 91 (Sept. 1980) and Moller et al, Paper Technology and Industry, April 1979, pps 110 to 114. These prior-art disks lack certain features critical to the present invention, which are discussed later.
  • One aspect of my invention is the discovery that fibres contaminated by stickies are relatively unwettable compared with uncontaminated fibres, and that a rotating disk having certain features can be used to separate relatively wettable and unwettable fibres.
  • Another aspect of my invention is a disk shape especially useful for removing contaminated fibres from a slurry with low energy consumption.
  • one aspect of the invention comprises a method for separating particles that are relatively wettable by a liquid from particles that are relatively unwettable, said particles being contained in a slurry of said liquid, comprising the steps of:
  • Another aspect of the invention comprises apparatus for separating particles that are relatively wettable by a liquid from particles that are relatively unwettable, said particles being contained in a slurry of said liquid, comprising:
  • a disk having an outside surface, said outside surface comprising a central section, a peripheral skirt section, and an intermediate section, said central and intermediate sections being joined to form a distinct annular outside corner, and said intermediate and skirt sections being joined to form a distinct annular inside corner, (b) means. for flowing slurry onto said central section,
  • (d) means for preventing relatively unwettable particles, propelled from said film from rejoining tf ⁇ e slurry contained in said film.
  • Fig. 1 is a vertical sectional schematic of apparatus for practicing the inventive process.
  • Fig. 2 is a vertical sectional schematic of another embodiment of apparatus for practicing the inventive process.
  • Fig. 3 is a vertical sectional view of a disk in accordance with the invention.
  • Description of the Preferred Embodiment Recently Oroskar has devised a specially shaped disk for separating fibres according, to size. See Oroskar, Ph.D. Thesis in Chemical Engineering entitled “Spray Fractionation", deposited at the University of Wisconsin Library November, 1982. Surprisingly, the disdk of Oroskar can be used to remove unwettable fibres from a slurry.
  • a slurry containing contaminated and uncontaminated cellulose fibers is continuously supplied by pipe 10 from a slurry tank or other source, not shown.
  • a process for separating contaminated and uncontaminated cellulose fibers contained in an aqueous slurry i.e. one inwhich a major portion of the liquid is water, will be discussed, it is understood that the invention is operable in any situation where relatively wettable and unwettable particles contained in a slurry are to be separated.
  • Pipe 10 flows the slurry onto disk 11, which has an outside surface 12.
  • the outside surface is the side of the disk over which slurry flows as described later.
  • Outside surface 12 has a central zone 14 and a peripheral skirt zone 15.
  • the disk is symmetrical about a central axis A.
  • Skirt zone 15 and central zone 14 are joined so as to form distinct outside corner 16.
  • corner 16 is annular, i.e. ring shaped.
  • the term "outside corner” means that the apex of the corner points to the outside of the disk, i.e. the side of the disk over which slurry flows.
  • central zone 14 is flat, as shown in Fig. 1. However, concave or convex central zones are operable.
  • skirt zone 15 is straight in cross-section, as shown, but non-straight shapes are operable.
  • disk 12 may not be a continuous curve in cross-section, such as the arc of a circle or ellipse. Such configurations would not provide a distinct outside corner.
  • the central ans skirt zones form an inside angle 17 of more than 90 and less than 180 degrees, more preferably 110 degrees to 160 degrees.
  • Disc l ⁇ is mounted on shaft 18, which is connected to means, not shown, for rotating the disk and shaft, such an electric motor.
  • Fig. 1 functions as follows. Pipe 1 flows slurry onto central zone 14 of disk 11. Shaft 18 and disk 11 rotate about axis A at such speed that a film 9 of liquid and relatively wettable fibres flows over corner 16 and skirt 15 and downward as shown by arrows B. However, a large portion of the relatively unwettable fibres, i.e. those contaminated by the stickies, are propelled from the slurry film as it flows over corner 16. The reason for the unwettable fibre's leaving the film is that their unwettability makes them unable to remain in the slurry as they undergo the change in direction while trying to turn the corner at 16.
  • Shelf 19 prevents the unwettable particles propelled from the slurry from rejoining the slurry.
  • the operation is performed in a spray chamber, such as those used in conventional spray drying operations.
  • a chamber for this operation would have a lower chamber below shelf 19 for collecting slurry and uncontaminated fibres and an upper chamber above shelf 19 for collecting contaminated fibres.
  • the speed of rotation of the disk depends on the disk's size and shape, and slurry flow rate, and the nature of the slurry and particles. Optimum rotation speed, which will vary from system to system, is easily determined experimentally by use of a variable speed drive on the motor driving shaft 18.
  • the disk should rotate fast enough to propel unwettable fibres from the slurry at corner 16, but not so fast that slurry and a substantial amount of wettable fibres leaves the film at the corner.
  • FIG. 2 shows apparatus wherein the slurry flows onto the bottom of the disk.
  • unwettable fibres represented by C' would fall to a lower spray chamber (not shown) below shelf 19
  • wettable fibres and slurry represented by arrows B', would collect in the upper spray chamber (not shown), above shelf 19.
  • Fig. 3 is a vertical sectional view of a disk designed to allow maximum separation forces to occur at the outside corner with least energy consumption and without causing excess slurry and wettable fibres to leave the film at that point.
  • Special disk 30 has outside surface 20, which has a central section 21, a peripheral skirt section 22, and an intermediate section 23. Central section 21 and intermediate section 23 meet to form distinct annular outside corner 24. Intermediate section 23 and skirt section 22 meet to form distinct annular inside corner 25.
  • Disk 30 is shown mounted on shaft 18 for rotation about axis A, as in Figs. 1 and 2. Disk 30 is operated similarly to disk 11. Disk 30 could be substituted for disk 11 in Figs. 1 or 2. Rotation of disk 30 causes a film of slurry to flow over corner 24, intermediate section 23, corner 25, and skirt 22. As in Figs. 1 and 2, unwettable fibres are propelled from the film at the outside corner.
  • central section 21 be flat and that intermediate and skirt sections 23 and 22 be straight in cross section as shown.
  • inside angle 26 at outside corner 24 is more than 90 and less than 180 degrees
  • outside angle 27 at inside corner 25 is more than 90 and less than 180 degrees.
  • the slurry in the top chamber contained 90.1% of the original solids and only 13.9% of the original contaminated fibers, showing a very significant improvement in the quality of the fibres remaining in the slurry film.
  • the slurry from the. top spray chamber could be passed over another rotating disk in accordance with the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

Les particules mouillables et non mouillables contenues dans une boue sont séparées en provoquant l'écoulement de la boue sur un disque rotatif (12) possédant une zone centrale (14), un coin extérieur distinct (16) et une jupe (15). Au fur et à mesure que la boue s'écoule en formant un film sur le coin (16), les particules s non mouillables se détachent du film et leur retour dans le film est empêché par un plateau (19). Ce procédé et ce dispositif sont utiles dans le recyclage de produits fibreux tels que du papier et du carton.
EP19840901904 1983-05-02 1984-04-25 Procede et dispositif de separation de particules mouillables et non mouillables Withdrawn EP0146565A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49076383A 1983-05-02 1983-05-02
US490763 1983-05-02

Publications (1)

Publication Number Publication Date
EP0146565A1 true EP0146565A1 (fr) 1985-07-03

Family

ID=23949366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840901904 Withdrawn EP0146565A1 (fr) 1983-05-02 1984-04-25 Procede et dispositif de separation de particules mouillables et non mouillables

Country Status (2)

Country Link
EP (1) EP0146565A1 (fr)
WO (1) WO1984004258A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5104522A (en) * 1990-05-09 1992-04-14 Wisconsin Alumni Research Foundation Spray fractionation disks and method of using the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1517509A (en) * 1922-03-04 1924-12-02 Hokanson Martin Apparatus for classifying granular material
US3591000A (en) * 1969-10-27 1971-07-06 Ira B Humphreys Method and apparatus for sizing and separating solids
US3819110A (en) * 1971-06-22 1974-06-25 V Baturov Method for suspension separation and apparatus for accomplishing same
SE397772B (sv) * 1975-07-29 1977-11-21 Niro Atomizer As Sett och anordning for uppdelning av en flytande suspension av fasta partiklar i fraktioner med olika genomsnittliga egenskaper
US4427541A (en) * 1982-04-28 1984-01-24 Wisconsin Alumni Research Foundation Method and apparatus for spray fractionation of particles in liquid suspension

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8404258A1 *

Also Published As

Publication number Publication date
WO1984004258A1 (fr) 1984-11-08

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Effective date: 19850405