EP0325976A2 - Cellule de flottation pneumatique - Google Patents

Cellule de flottation pneumatique Download PDF

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Publication number
EP0325976A2
EP0325976A2 EP89100628A EP89100628A EP0325976A2 EP 0325976 A2 EP0325976 A2 EP 0325976A2 EP 89100628 A EP89100628 A EP 89100628A EP 89100628 A EP89100628 A EP 89100628A EP 0325976 A2 EP0325976 A2 EP 0325976A2
Authority
EP
European Patent Office
Prior art keywords
separation cell
riser pipe
flotation
outlet
separation
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Withdrawn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
EP89100628A
Other languages
German (de)
English (en)
Other versions
EP0325976A3 (fr
Inventor
Ulrich Arnold Reilard
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.)
Allmineral Aufbereitungstechnik GmbH and Co KG
Original Assignee
Allmineral Aufbereitungstechnik GmbH and Co KG
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 Allmineral Aufbereitungstechnik GmbH and Co KG filed Critical Allmineral Aufbereitungstechnik GmbH and Co KG
Publication of EP0325976A2 publication Critical patent/EP0325976A2/fr
Publication of EP0325976A3 publication Critical patent/EP0325976A3/fr
Withdrawn legal-status Critical Current

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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
    • B03D1/1406—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
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type

Definitions

  • the invention relates to a device for carrying out a pneumatic flotation consisting of a separation cell with a discharge for the flotation outlets and with a foam gutter and associated discharge and at least one gassing reactor connected to the separation cell for the slurry to be flotated.
  • a generic flotation plant is mentioned in the publication "5 years of operating experience with pneumatic flotation in hard coal processing", Processing Technology No. 1/1987, pages 1 - 9;
  • the sludge aerated in the gassing reactors is introduced into the separating vessel via inlets in the wall of the cone shaped into the cone, the slurry flowing into the separating vessel in a free jet.
  • the known system has the disadvantage that a correspondingly high outlet speed of the sludge results in the area of the inlets for the gassed sludge into the separation vessel.
  • the associated turbulence disadvantageously means that solid particles with air bubbles do not accumulate on the foam layer, but instead reach the sinking flow of the flotation outlets immediately or after the air bubbles have been torn off due to turbulence. This is associated with a deterioration in the sorting result.
  • the object of the invention is therefore to remedy this situation and to provide a device for carrying out a pneumatic flotation, by means of which the sorting result of pneumatic flotation systems is significantly improved.
  • the invention is associated with the advantage that the flow energy is reduced in the settling section switched between the gassing reactor and the separating vessel, so that the sludge enters the separating vessel at the transition from the settling section without any significant turbulence, which is why the sorting process takes place there without any impairment Can be found.
  • care must be taken within the scope of the invention that a sufficient flow speed for transporting the conditioned slurry into the separation vessel is ensured.
  • the calming section is designed as a riser pipe, which is led up into the separating vessel and in it with its turbidity outlet to just below the underside of the foam layer formed during the flotation process.
  • the airy valuable material can best be classified in the foam layer without the bubbles tearing off;
  • the flotation outlets that are carried decrease immediately after they emerge from the riser pipe from the calmed turbidity to the discharge for the flotation outlets at the bottom of the separation cell.
  • the riser tube can be displaced or it can be formed from two pipe parts pushed into one another like a telescope.
  • the invention also has advantages with regard to improving the sorting result if certain dimensional relationships between the riser pipe and the separating vessel are adhered to, since the slurry fed in via the riser pipe should cover as large a foam area as possible in order to achieve good efficiency to ensure the flotation plant.
  • the ratio of the cross-sectional area of the riser pipe to the cross-sectional area of the phase separation cell should be less than 1.25.
  • the flotation system 10 has a separating cell 11, the bottom wall 12 of which is placed in a funnel shape at an angle downward, a discharge opening 14 for the lowered flotation outlets being arranged at the base of the side wall 13 which comes together there.
  • the separation cell 11 opens into a circumferential foam gutter 15 with a foam product discharge 16.
  • two separation cells 11 are combined in a foam gutter 15.
  • Each separation cell 11 is assigned a gassing reactor 17 which is arranged at a distance from the separation cell below it. Bridging the distance between separation cell 11 and associated gassing reactor 17, a riser pipe 18 is arranged as a calming section, which with its upper turbidity outlet 19 enters the separation Cell 11 into it - and led up to this near to the lower edge of a foam layer, which is not shown in detail, but which occurs in the operation of the flotation system 10 in the upper region of the separation cell 11.
  • an emergency drain 20 is located at the lower end of the riser pipe 18.
  • slurry to be floated is aerated in the gassing reactor 17 and, due to the high specific energy input required, enters the riser pipe 18 at a comparatively high speed.
  • the flow energy degrades to such an extent that the conditioned slurry enters the separation cell 11 at the slurry outlet 19 without any significant turbulence.
  • the distance between turbidity outlet 19 and the lower limit of the foam layer is dimensioned such that, on the one hand, the heavier leaving particles not contaminated with air bubbles separate from the foam and sink to the discharge opening 14, and on the other hand, those contaminated with valuable material Bubbles can be integrated into the existing foam layer as quickly as possible without the bubbles being destroyed or the adhesion between the bubbles and the valuable substance being impaired.
  • the dimensions of the riser pipe 18 in relation to the surface of the separation cell 11 are also related to the advantageous effect of the flotation system according to the invention, since, due to the spreading of the cloudy area after leaving the cloudy outlet 19, the one which is also given as a function of the distance of the cloudy outlet 19 from the lower foam limit Size of the foam area should roughly match the spreading area of the slurry.
  • the design rules for this are to be coordinated depending on the capacity of the separation cell and the flotation specifications.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Physical Water Treatments (AREA)
EP19890100628 1988-01-23 1989-01-14 Cellule de flottation pneumatique Withdrawn EP0325976A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3801905 1988-01-23
DE3801905A DE3801905A1 (de) 1988-01-23 1988-01-23 Pneumatische flotationszelle

Publications (2)

Publication Number Publication Date
EP0325976A2 true EP0325976A2 (fr) 1989-08-02
EP0325976A3 EP0325976A3 (fr) 1991-06-26

Family

ID=6345835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890100628 Withdrawn EP0325976A3 (fr) 1988-01-23 1989-01-14 Cellule de flottation pneumatique

Country Status (3)

Country Link
EP (1) EP0325976A3 (fr)
DE (1) DE3801905A1 (fr)
ZA (1) ZA89245B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5591328A (en) * 1990-11-23 1997-01-07 Atomaer Pty. Ltd. Gas particle formation
WO1997003754A1 (fr) * 1995-07-14 1997-02-06 Coproco Development Corporation Procede de recuperation de cuivre dans un materiau en contenant
EP0770428A1 (fr) * 1995-10-27 1997-05-02 Antonio Caravaggio Installation de flottaison avec variation cyclique du volume de liquide
US5643459A (en) * 1995-04-26 1997-07-01 Cominco Engineering Services Ltd. Flotation method and apparatus
US6000552A (en) * 1996-08-03 1999-12-14 Sunds Defibrator Industries Ab Process for purification of a fiber suspension

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416261C1 (de) * 1994-05-07 1995-06-01 Kali & Salz Ag Verfahren und Vorrichtung zur rührerlosen Flotation von Stoffen mit geringem Hydrophobierungsgrad und/oder geringer Stabilität im Schaumverband, insbesondere von Salzgemengen
RU2121884C1 (ru) * 1997-11-04 1998-11-20 Открытое Акционерное Общество "Уралэнергоцветмет" Флотационная пневматическая колонная машина
RU2310515C2 (ru) * 2005-09-23 2007-11-20 ООО "Инновационный Центр "Энергоэффективность" Флотационная машина
CN110038732A (zh) * 2019-05-09 2019-07-23 北京科技大学 一种用于浮选机的分质分流泡沫溜槽

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4234349A (en) * 1979-04-16 1980-11-18 Davies Hamakua Sugar Co., A Division Of Theo. H. Davies, Ltd. Apparatus for the purification of evaporated sugar solutions
US4585561A (en) * 1983-07-25 1986-04-29 Agfa-Gevaert Aktiengesellschaft Flotation process for the continuous recovery of silver or silver compounds from solutions or dispersions
FR2574002B1 (fr) * 1984-11-30 1987-02-27 Inst Nat Rech Chimique Perfectionnement apporte a la separation et a la recuperation de solides a partir de liquides les contenant et faisant appel au procede de flottation ionique, et moyen pour la mise en oeuvre de ce perfectionnement
DE3707905C1 (en) * 1987-03-12 1988-08-18 Santrade Ltd Process and apparatus for flotation, in particular for waste water purification

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5591328A (en) * 1990-11-23 1997-01-07 Atomaer Pty. Ltd. Gas particle formation
US5807479A (en) * 1994-07-15 1998-09-15 Coproco Development Corporation Process for recovering copper from copper-containing material
US5643459A (en) * 1995-04-26 1997-07-01 Cominco Engineering Services Ltd. Flotation method and apparatus
WO1997003754A1 (fr) * 1995-07-14 1997-02-06 Coproco Development Corporation Procede de recuperation de cuivre dans un materiau en contenant
EP0770428A1 (fr) * 1995-10-27 1997-05-02 Antonio Caravaggio Installation de flottaison avec variation cyclique du volume de liquide
US6000552A (en) * 1996-08-03 1999-12-14 Sunds Defibrator Industries Ab Process for purification of a fiber suspension

Also Published As

Publication number Publication date
ZA89245B (en) 1989-10-25
EP0325976A3 (fr) 1991-06-26
DE3801905A1 (de) 1989-08-03
DE3801905C2 (fr) 1989-11-02

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