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WO2003078013A2 - Dispositif et procede de flottation - Google Patents

Dispositif et procede de flottation Download PDF

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Publication number
WO2003078013A2
WO2003078013A2 PCT/FI2003/000171 FI0300171W WO03078013A2 WO 2003078013 A2 WO2003078013 A2 WO 2003078013A2 FI 0300171 W FI0300171 W FI 0300171W WO 03078013 A2 WO03078013 A2 WO 03078013A2
Authority
WO
WIPO (PCT)
Prior art keywords
cell
flotation
support element
edge
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.)
Ceased
Application number
PCT/FI2003/000171
Other languages
English (en)
Other versions
WO2003078013A3 (fr
Inventor
Heikki Oravainen
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.)
Outokumpu Oyj
Original Assignee
Outokumpu Oyj
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 Outokumpu Oyj filed Critical Outokumpu Oyj
Priority to AU2003208381A priority Critical patent/AU2003208381A1/en
Publication of WO2003078013A2 publication Critical patent/WO2003078013A2/fr
Publication of WO2003078013A3 publication Critical patent/WO2003078013A3/fr
Anticipated expiration legal-status Critical
Ceased 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
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth

Definitions

  • the invention relates to a flotation arrangement and method, defined in the preambles of the independent claims, for flotating minerals or the like from slurries containing these particles.
  • a flotation machine used for recovering valuable ingredients comprises a flotation cell provided with an inlet aperture for feeding slurry into the cell and an outlet aperture for removing the non-flotated material from the flotation cell.
  • Flotation cells can be single mixing vessels, or they can be coupled in series or in parallel. In shape, they can be rectangular or cylindrical, with a horizontal or vertical position.
  • the air needed for producing the foam is fed in through a hollow rotatable axis, which axis is connected to an agitating member that mixes the slurry in order to maintain the slurry in suspension. When the agitator rotates, air is fed into the slurry, and air bubbles are dispersed in the slurry.
  • the cell can also be pneumatic, in which case air is fed to the cell through specific elements, and mechanical mixing is not applied.
  • reagents attached onto the surface of the valuable particles that are contained in the slurry and should be recovered. These reagents make the valuable particles hydrophobic, and thus help them to be attached to the air bubbles.
  • the valuable particles start rising upwards, towards the free top surface of the flotation cell, where they form a stabile foam bed. From the foam layer, the valuable particles rise further out of the cell to discharge chutes.
  • the useless ingredients are made hydrophobic, in which case the valuable material remains non-flotated in the flotation process.
  • the slurry viscosity is high, large amounts of air cannot be dispersed therein, because the air bubbles grow too big and thus hinder the foam from being obtained over the cell edge.
  • the foam layer in the cell is supported against the cell edges and is well formed, but it is more difficult to get it out of the cell due to the limited amount of air.
  • the amount of air is not sufficient for lifting the foam layer out of the cell.
  • the problem often is the fact that the foam bed in the top part of the cell collapses, because the length of the slurry edge is too long with respect to the required concentrate production.
  • foam beds that are highly loaded can grow to be so heavy that they are nearly impossible to discharge through the discharge chutes, in which case the foam bed may collapse completely.
  • the foam collapses at least some of the mineral particles return to the slurry. Now a new air bubble is needed in order to lift each mineral particle back to the foam layer. This slows down the flotation process, the efficiency in the use of air is low and the excess air mechanically lifts into the foam more and more valueless minerals and other material.
  • a flotation machine where inside the created foam bed, there is installed a downwardly narrowing, wedge-like or conical element for adjusting the volume and/or surface area of the foam bed. By means of said adjusting element, the foam bed becomes thick, and simultaneously the foam is directed, when proceeding upwardly, towards the flotation machine walls and discharge chutes connected to the walls.
  • a flotation machine and in the slurry tank of said flotation machine, essentially underneath the foam bed created in the machine, there is installed at least one control element, so that the free surface of the flotation machine, essentially at least in the slurry tank underneath the foam bed, can be reduced when proceeding upwardly.
  • the creation speed of the air bubbles containing mineral particles can be increased, because the volume flow of the air bubbles containing mineral particles per area unit increases, as the free space decreases.
  • the invention also aims at increasing the removal of the foam contained in the foam bed from the flotation cell.
  • arrangements according to the above described solutions take up space in the total volume space of the cell, but they do not seem to provide a sufficiently advantageous solution for supporting the foam bed and for facilitating the foam discharge.
  • the object of the present invention is to realize a novel solution whereby the drawbacks of the prior art can be avoided.
  • the object of the invention is to facilitate a continuously operated foam discharge from the flotation cell, so that at the top edge of the flotation cell, there is arranged at least one support element that supports the foam layer and helps to discharge the foam layer out of the flotation cell.
  • the flotation arrangement according to the invention for flotating minerals and the like from slurries containing these particles comprises a flotation cell, provided with edges and a bottom, and a mixing mechanism arranged in the flotation cell.
  • the flotation arrangement comprises means for feeding air into the cell and elements for feeding the material to be flotated into the cell and for discharging it out of the cell.
  • at least one support element In order to support the foam layer and in order to facilitate its removal from the cell, in connection with the top edge of the cell, there is arranged at least one support element. There is provided a sufficient number of support elements, depending on the concentrate to be treated and on the cell size.
  • the support element can be formed of one single part, or it may be composed of several different parts.
  • the support element can be formed of the cell edge, or it can be a separate element to be attached to the edge.
  • the shape of the support element is serrated, undulated or the like.
  • the use of the support element enhances a continuous removal of the mineral foam from the cell to the discharge chutes. In particular, it enhances the flotation of low-content ores in processes where the length of the slurry edge is too long in comparison with the required concentrate production, and thus the flotation becomes difficult because the foam collapses. In addition, it particularly enhances the flotation of such ores where the viscosity of the slurry is so high, that large amounts of air cannot be dispersed into the slurry.
  • the foam does not rise over the edges, although the foam layer is well created and supported by the cell edges.
  • the length of the foam edge is limited to a certain length per a given concentrate production.
  • the support element according to the invention helps the already created foam layer to stay together, and to be discharged from the cell.
  • a suitable length of slurry edge in the cell In order to succeed in obtaining a given concentrate production in flotation, there also is required a suitable length of slurry edge in the cell. When the edge is too long, as it is with low-content ores, the result may be the collapsing of the foam layer.
  • the support element By using a support element having a serrated, undulated or other similar shape in connection with the top edge of the flotation cell, it is possible to see a suitable length for the foam edge in order to successfully remove the foam from the cell.
  • the length of the foam edge is adjusted to the desired concentrate production.
  • the length of the foam edge changes steplessly from zero to a hundred per cent of the length of the slurry edge, when raising the slurry surface located underneath the foam.
  • the support element there can be found a suitable height for the slurry surface, corresponding to the length of an optimal slurry edge.
  • the flotation process proceeds without interruptions that are often due to the collapsing of the foam.
  • the solution according to the invention is easy to realize and economical in costs. When possible future interruptions in the process are eliminated even at one cell, a flotation process maintained by a series of cells is remarkably enhanced.
  • FIG. 1 An arrangement according to the invention.
  • FIG. 1 An arrangement according to another preferred embodiment of the invention.
  • FIGs 1 and 2 illustrate flotation arrangements 1 and 15 according to different embodiments of the invention.
  • the shape of the support element 6 is serrated.
  • Figure 2 illustrates another embodiment of the invention, according to which the support element 14 is undulated in shape.
  • the flotation cell 3 comprising edges 2 and a bottom 10
  • the mixing mechanism arranged inside the flotation cell is not illustrated, and neither are the elements for feeding air into the cell, because they are likewise located inside the cell.
  • the support element 6 and 14 When air is fed in, along with the flotation process there is created a foam layer 5 on the slurry surface 13, and the creation of said foam layer 5 as it rises further up in the cell 3, is supported by the support element 6 and 14 according to the invention.
  • the support element is either undulated or serrated, and it is made of a separate element and attached at the top edge 4 of the cell by using fastening elements, for instance bolts.
  • fastening elements for instance bolts.
  • the suitable length 7 of the foam edge is determined by the serrated or undulated support element, there can be found a suitable height 9 for the slurry surface, corresponding to the length of an optimal slurry edge.
  • the length of an optimal slurry edge is known, the continuous discharge of the foam from the cell 3 to the discharge chutes 12 located in connection with the top edge 4 is enhanced.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Physical Water Treatments (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

La présente invention concerne un dispositif de flottation (1, 15) permettant de faire flotter des minéraux ou analogues issus de suspensions contenant lesdites particules, ledit dispositif de flottation comprenant une cellule de flottation (3) présentant des bords (2) et un fond (10), ainsi qu'un mécanisme de mélange conçu dans la cellule de flottation, des éléments permettant d'alimenter l'air dans la cellule et des éléments permettant d'alimenter le matériau à faire flotter dans la cellule et permettant d'éliminer de la cellule le matériau ayant flotté, de sorte qu'au moins un élément de support (6, 14) est relié au bord supérieur (4) pour faciliter l'évacuation de la couche de mousse (5) et pour supporter la couche de mousse (5). De plus, l'invention concerne un procédé permettant de faire flotter des minéraux ou analogues issus de suspensions contenant lesdites particules à l'aide d'un dispositif de flottation (1, 15), ledit dispositif de flottation comprenant une cellule de flottation (3) présentant des bords (2) et un fond (10), ainsi qu'un mécanisme de mélange conçu dans la cellule de flottation, des éléments permettant d'alimenter l'air dans la cellule et des éléments permettant d'alimenter le matériau à faire flotter dans la cellule et permettant d'éliminer de la cellule le matériau ayant flotté, de sorte que la couche de mousse (5) est supportée et son élimination est facilitée par au moins un élément de support (6, 14) relié au bord supérieur (4) de la cellule de flottation (3).
PCT/FI2003/000171 2002-03-18 2003-03-06 Dispositif et procede de flottation Ceased WO2003078013A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003208381A AU2003208381A1 (en) 2002-03-18 2003-03-06 Flotation arrangement and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20020500 2002-03-18
FI20020500A FI115447B (fi) 2002-03-18 2002-03-18 Vaahdotuslaitteisto ja -menetelmä

Publications (2)

Publication Number Publication Date
WO2003078013A2 true WO2003078013A2 (fr) 2003-09-25
WO2003078013A3 WO2003078013A3 (fr) 2003-12-24

Family

ID=8563571

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2003/000171 Ceased WO2003078013A2 (fr) 2002-03-18 2003-03-06 Dispositif et procede de flottation

Country Status (5)

Country Link
AR (1) AR039006A1 (fr)
AU (1) AU2003208381A1 (fr)
FI (1) FI115447B (fr)
PE (1) PE20030878A1 (fr)
WO (1) WO2003078013A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012009871A1 (fr) * 2010-07-22 2012-01-26 Li Bin Grande colonne de flottation à pulvérisation cyclonique
US9074149B2 (en) 2009-01-21 2015-07-07 Lummus Technology Inc. Methods and systems for treating a gasification slag product
ITUB20156822A1 (it) * 2015-12-11 2017-06-11 Paolo Bozzato Apparato e procedimento per la separazione con schiuma
WO2019008216A1 (fr) * 2017-07-04 2019-01-10 Outotec (Finland) Oy Procédé de flottation par mousse et agencement de flottation par mousse
CN109290069A (zh) * 2018-09-25 2019-02-01 北矿机电科技有限责任公司 一种泡沫层强度增大的装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE363816C (de) * 1919-05-08 1922-11-14 Elektro Osmose Akt Ges Graf Sc Vorrichtung zur Erzaufbereitung nach dem Schaumschwimmverfahren
US1480884A (en) * 1920-12-15 1924-01-15 Pneumatic Process Flotation Co Method of concentrating ores
US5158678A (en) * 1990-09-28 1992-10-27 Broussard Paul C Sr Water clarification method and apparatus
FI88268C (fi) * 1991-03-27 1993-04-26 Outomec Oy Flotationsmaskin
FI914128A0 (fi) * 1991-09-02 1991-09-02 Outokumpu Oy Foerfarande foer reglering av skum- nivaon i flotationsmaskiner.
SE508704C2 (sv) * 1992-02-03 1998-10-26 Johansson Jan Erik Anordning vid flotationsapparat
US6019898A (en) * 1998-06-23 2000-02-01 Aqua-Aerobic Systems, Inc. Weir assembly with movable baffle member

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9074149B2 (en) 2009-01-21 2015-07-07 Lummus Technology Inc. Methods and systems for treating a gasification slag product
WO2012009871A1 (fr) * 2010-07-22 2012-01-26 Li Bin Grande colonne de flottation à pulvérisation cyclonique
ITUB20156822A1 (it) * 2015-12-11 2017-06-11 Paolo Bozzato Apparato e procedimento per la separazione con schiuma
WO2017098401A1 (fr) * 2015-12-11 2017-06-15 Paolo Bozzato Appareil et procédé de séparation par moussage
CN109070097A (zh) * 2015-12-11 2018-12-21 Wv过程解决方案公司 用于泡沫分离的设备和方法
WO2019008216A1 (fr) * 2017-07-04 2019-01-10 Outotec (Finland) Oy Procédé de flottation par mousse et agencement de flottation par mousse
CN109290069A (zh) * 2018-09-25 2019-02-01 北矿机电科技有限责任公司 一种泡沫层强度增大的装置

Also Published As

Publication number Publication date
AU2003208381A8 (en) 2003-09-29
FI20020500A7 (fi) 2003-09-19
FI20020500A0 (fi) 2002-03-18
WO2003078013A3 (fr) 2003-12-24
PE20030878A1 (es) 2003-11-25
FI115447B (fi) 2005-05-13
AU2003208381A1 (en) 2003-09-29
AR039006A1 (es) 2005-02-02

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