[go: up one dir, main page]

WO2003055608A1 - Procede et appareil permettant une efficacite de flottaison accrue - Google Patents

Procede et appareil permettant une efficacite de flottaison accrue Download PDF

Info

Publication number
WO2003055608A1
WO2003055608A1 PCT/FI2002/000977 FI0200977W WO03055608A1 WO 2003055608 A1 WO2003055608 A1 WO 2003055608A1 FI 0200977 W FI0200977 W FI 0200977W WO 03055608 A1 WO03055608 A1 WO 03055608A1
Authority
WO
WIPO (PCT)
Prior art keywords
flotation
slurry
cell
air
feed
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/FI2002/000977
Other languages
English (en)
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 AU2002350758A priority Critical patent/AU2002350758A1/en
Publication of WO2003055608A1 publication Critical patent/WO2003055608A1/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
    • 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
    • B03D1/16—Flotation machines with impellers; Subaeration machines
    • B03D1/18—Flotation machines with impellers; Subaeration machines without air supply
    • 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
    • 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
    • B03D1/1456—Feed mechanisms for the slurry

Definitions

  • the invention relates to the method and apparatus defined in the preambles of the independent claims for making flotation more effective.
  • 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 the non-flotated material to be removed from the flotation cell.
  • Flotation cells can be single mixing vessels 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 to foam chutes.
  • the useless ingredients are made hydrophobic, in which case the valuable material remains non-flotated in the flotation process.
  • flotation is made more effective by feeding flowing material for slurry dilution to the top part of the cell, underneath the foam zone.
  • Said material can be liquid, such as water or diluted slurry.
  • the dilution reduces the slurry density near the boundary surface between the slurry and the foam and generates a stabile foam that is easily removed as overflow from the top part of the tank.
  • the object of the invention is to introduce a novel apparatus and method for making flotation more effective, according to which slurry is pretreated by air prior to feeding the slurry into the flotation cell.
  • the object of the invention is to pretreat the slurry by feeding air bubbles into the slurry flow through a porous lining in order to boost the creation of good flotation conditions already before the flotation cell.
  • the slurry to be fed in a flotation cell is pretreated by feeding air bubbles therein prior to feeding the slurry into the flotation cell, so that flotation conditions are created already before the flotation cell.
  • the slurry is fed into the flotation cell through a feed element, such as a pipe.
  • the purpose of the air bubbles is to enhance the recovery of valuable minerals from the slurry, i.e. to make the whole flotation process more effective.
  • By feeding small-size air bubbles into the slurry the mixing of air bubbles and slurry is made more effective, and particularly the recovery of minerals with a small grain size is intensified in the flotation step proper.
  • the air feed pressure must be higher than the pressure of the flowing slurry in the feed element.
  • a nozzle or the like into the slurry there is fed at least flotation reagents, for instance advantageously before feeding in air, which reagents make it possible that the air bubbles carrying valuable particles remain separate and are not combined.
  • Certain reagents make the valuable particles hydrophobic, and thus help the valuable particles to be attached to the air bubbles.
  • air bubbles are fed into the slurry by means of a feeding nozzle before the slurry enters the flotation cell.
  • air is fed in at that point of the pipe where the prevailing pressure is highest, i.e. where the feed element, such as a venturi pipe, is thinnest.
  • Air is fed through a specific feed nozzle or the like to an air cavity, from which it proceeds through a porous, wear-resistant material, such as a ceramic element, to the pipe exactly when the highest pressure prevails.
  • the feed element is, at the point where air is fed in, completely lined with a wear-resistant material, and the air cavity is arranged around it.
  • the maximum diameter of said bubbles being one millimeter.
  • the flotation process is made more effective and the flotation rate is increased, which makes it possible to reduce the size of the flotation cell, or to leave one of the cells out of the series, and consequently save in the expenses.
  • the slurry that is treated with air can be fed into the cell either through the top of the cell, through the bottom of the cell or most advantageously through the side of the cell.
  • Flotation is made more effective, when the slurry to be fed into the cell already contains bubbles bearing valuable minerals, and the flotation time is reduced. In addition, particularly the recovery of small valuable mineral particles is made more effective.
  • more air and reagents required by the flotation process can be fed into the flotation cell.
  • FIG. 1 Cross-sectional illustration of an apparatus according to a preferred embodiment of the invention
  • Figure 1 is a cross-sectional side-view illustration of that point of a venturi pipe 1 where air is fed into the slurry flowing in the venturi pipe.
  • Air is fed through a specific feed nozzle 2 designed for the purpose, at a high pressure to an air cavity 3 that surrounds the pipe 1.
  • air is conducted through a ceramic element 4 surrounding the pipe to said pipe, so that the air bubbles are formed as the air flow proceeds through the small holes - with a diameter that is advantageously less than one millimeter - provided in the ceramic element.
  • the feeding pressure is in proportion to the flow rate of the slurry flowing in the pipe.
  • the flotation reagent Before feeding air into the slurry, there is added the flotation reagent through the nozzle 5.
  • the reagent ensures that the air bubbles carrying the valuable particles remain separate and are not combined.
  • a normal flotation process takes place, and more flotation reagents can also be added into the slurry in the flotation cell.
  • FIGs 2a, 2b and 2c illustrate various different ways to realize the invention.
  • Slurry can be fed into the flotation cell at many different spots of the cell.
  • slurry is conducted through a venturi pipe 1 to a feed box 7, where excessive flotation is created.
  • the slurry is conducted into the flotation cell 6 at the lower part of the cell side 8, from where it rises as foam to the top part of the cell, and the valuable ingredients are collected for instance as overflow into the chutes.
  • Air is added into the slurry through the feed nozzle 2, from where it proceeds to the air cavity 3 and further through the ceramic element 4 to the slurry flow as air bubbles.
  • the flotation reagents are fed into the slurry flow through the nozzle 5.
  • Figure 2b differs from the latter in that the air feed point is arranged to be nearer to the flotation cell, and there is no feed aperture.
  • Figure 2c illustrates how slurry is fed through the top part of the cell.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Underground Or Underwater Handling Of Building Materials (AREA)

Abstract

L'invention concerne un appareil permettant une efficacité de flottaison accrue, ledit appareil comprenant une cellule de flottaison pourvue d'un moyen de flottaison approprié et un élément d'amenée, notamment un conduit permettant d'amener la boue dans la cellule de flottaison; dans l'élément d'amenée (1), est agencé au moins un ajutage d'amenée (2) permettant d'ajouter de l'air dans la boue, avant que la boue ne pénètre dans la cellule de flottaison (6). En outre, l'invention concerne un procédé permettant une efficacité de flottaison accrue, faisant appel à l'appareil décrit dans la revendication (1), ledit appareil comprenant une cellule de flottaison pourvue d'un moyen de flottaison approprié, et un élément d'amenée, notamment un conduit permettant d'amener de la boue dans la cellule de flottaison, de sorte que de la boue s'écoule dans l'élément d'amenée (1). De l'air arrive par au moins un ajutage d'amenée (2) avant que la boue ne pénètre dans la cellule de flottaison (6).
PCT/FI2002/000977 2001-12-21 2002-12-03 Procede et appareil permettant une efficacite de flottaison accrue Ceased WO2003055608A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002350758A AU2002350758A1 (en) 2001-12-21 2002-12-03 Method and apparatus for making flotation more effective

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20012538A FI20012538L (fi) 2001-12-21 2001-12-21 Menetelmä ja laitteisto vaahdotuksen tehostamiseksi
FI20012538 2001-12-21

Publications (1)

Publication Number Publication Date
WO2003055608A1 true WO2003055608A1 (fr) 2003-07-10

Family

ID=8562545

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2002/000977 Ceased WO2003055608A1 (fr) 2001-12-21 2002-12-03 Procede et appareil permettant une efficacite de flottaison accrue

Country Status (4)

Country Link
AU (1) AU2002350758A1 (fr)
FI (1) FI20012538L (fr)
PE (1) PE20030651A1 (fr)
WO (1) WO2003055608A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130220894A1 (en) * 2010-11-03 2013-08-29 Lilla Grossman Flotation Apparatus and Flotation Method
US10569196B2 (en) 2013-08-28 2020-02-25 Outotec (Finland) Oy Method and apparatus for treating a feed stream for a flotation device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2552343A1 (fr) * 1983-09-27 1985-03-29 Rech Geolog Miniere Procede et appareil de separation par flottation
US5096572A (en) * 1990-03-12 1992-03-17 Board Of Control Of Michigan Tech. University Froth flotation
US5397001A (en) * 1988-01-27 1995-03-14 Virginia Polytechnic Institute & State U. Apparatus for the separation of hydrophobic and hydrophilic particles using microbubble column flotation together with a process and apparatus for generation of microbubbles
WO1995021698A1 (fr) * 1994-02-14 1995-08-17 Commonwealth Scientific And Industrial Research Organisation Appareil et procede de separation selective de matiere hydrophobe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2552343A1 (fr) * 1983-09-27 1985-03-29 Rech Geolog Miniere Procede et appareil de separation par flottation
US5397001A (en) * 1988-01-27 1995-03-14 Virginia Polytechnic Institute & State U. Apparatus for the separation of hydrophobic and hydrophilic particles using microbubble column flotation together with a process and apparatus for generation of microbubbles
US5096572A (en) * 1990-03-12 1992-03-17 Board Of Control Of Michigan Tech. University Froth flotation
WO1995021698A1 (fr) * 1994-02-14 1995-08-17 Commonwealth Scientific And Industrial Research Organisation Appareil et procede de separation selective de matiere hydrophobe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130220894A1 (en) * 2010-11-03 2013-08-29 Lilla Grossman Flotation Apparatus and Flotation Method
US9475066B2 (en) * 2010-11-03 2016-10-25 Primetals Technologies Germany Gmbh Flotation apparatus and flotation method
US10569196B2 (en) 2013-08-28 2020-02-25 Outotec (Finland) Oy Method and apparatus for treating a feed stream for a flotation device

Also Published As

Publication number Publication date
FI20012538A7 (fi) 2003-06-22
AU2002350758A1 (en) 2003-07-15
PE20030651A1 (es) 2003-09-10
FI20012538A0 (fi) 2001-12-21
FI20012538L (fi) 2003-06-22

Similar Documents

Publication Publication Date Title
US3371779A (en) Concentration of minerals
US4998624A (en) Method of separating carbonaceous components from particulate coal containing inorganic solids and apparatus therefor
US3446353A (en) Method and apparatus for froth flotation
EP3038757B1 (fr) Procédé et appareil pour traiter un courant d'alimentation pour un dispositif de flottaison
US7624877B2 (en) Separate size flotation device
WO2012090167A2 (fr) Machine de flottation
CN101622074A (zh) 浮选分离装置和方法
US4247391A (en) Froth flotation cell and method of operation
US4394258A (en) Froth flotation apparatus with water recovery and method
AU702378B2 (en) Flotation column with constant feed arrangement
RU2603984C2 (ru) Диспергирующая форсунка, оснащенная ею флотационная установка, а также способ ее эксплуатации
CN110913991A (zh) 泡沫浮选装置以及泡沫浮选方法
CA2117620C (fr) Appareil de nettoyage a membrane pour installation de flottation
CA1210167A (fr) Flottation par moussage sur colonne
WO2003055608A1 (fr) Procede et appareil permettant une efficacite de flottaison accrue
CA2393777C (fr) Machine de flottation et procede destine a ameliorer l'effet de flottation
CN113198622A (zh) 一种微泡二次矿化浮选设备及浮选方法
US20210205823A1 (en) Froth flotation apparatus
WO2003078013A2 (fr) Dispositif et procede de flottation
US6019497A (en) Mixing
AU2004222669B2 (en) A separate size flotation device
CN120038054A (zh) 一种磁性矿物精选设备
CA1174378A (fr) Methode et installation de flottation
WO2025017245A1 (fr) Agencement d'alimentation en fluide gazéifié et cellule de flottation
CA1116321A (fr) Chambre de flottation sur mousse

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LU MC NL PT SE SI SK TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP