EP0229224A2 - Verfahren und Vorrichtung zur Schaumflotation - Google Patents

Verfahren und Vorrichtung zur Schaumflotation Download PDF

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Publication number
EP0229224A2
EP0229224A2 EP86113124A EP86113124A EP0229224A2 EP 0229224 A2 EP0229224 A2 EP 0229224A2 EP 86113124 A EP86113124 A EP 86113124A EP 86113124 A EP86113124 A EP 86113124A EP 0229224 A2 EP0229224 A2 EP 0229224A2
Authority
EP
European Patent Office
Prior art keywords
flotation
slurry
froth
cell
feeding
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
EP86113124A
Other languages
English (en)
French (fr)
Other versions
EP0229224A3 (de
Inventor
Alex Szentlaszloi
Francis J. Mcdonnell
James V. Duttera
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.)
Standard Oil Co
Original Assignee
Standard Oil Co
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 Standard Oil Co filed Critical Standard Oil Co
Publication of EP0229224A2 publication Critical patent/EP0229224A2/de
Publication of EP0229224A3 publication Critical patent/EP0229224A3/de
Ceased 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
    • B03D1/02—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
    • B03D1/02—Froth-flotation processes
    • B03D1/028—Control and monitoring of flotation processes; computer models therefor
    • 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
    • B03D1/08—Subsequent treatment of concentrated product
    • B03D1/082—Subsequent treatment of concentrated product of the froth product, e.g. washing
    • 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
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
    • 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
    • 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

  • This invention relates to a method and apparatus for flotation separation and more particularly to a method and apparatus for beneficiating carbonaceous matter by flotation separation.
  • Coal is an extremely valuable natural resource in the United States because of its relative abundant supplies in this nation. It has been estimated that the United States has more energy available in the form of coal than in the combined natural resources of petroleum, natural gas, oil shale, and tar sands. Recent energy shortages, together with the availability of abundant coal reserves and the continuing uncertainties regarding the availability of crude oil, have made it imperative that methods for convert­ing coal into a more useful energy source be developed.
  • Some known prior art processes for froth flotation separation of a slurry of particulate matter are based on constructions wherein air is introduced into the liquid slurry of the particulate matter as, e.g., through a porous cell bottom or a hollow impeller shaft, thereby producing a surface froth.
  • These prior art methods are relatively inefficient approaches especially when large concentrations of particulate matter are being processed.
  • these techniques are inefficient in providing sufficient contact area between the particulate matter and frothing air. As a result, large amounts of energy can be expended in frothing.
  • froth flotation techniques which permit bubbles to rise in the slurry can tend to trap and carry impurities, such as ash in the froth slurry, and accordingly the resultant beneficiated particulate product can have more impurities therein than necessary.
  • U.S. Patent No. 3,35l,l99 discloses an apparatus for froth flotation comprising a flotation cell divided in its upper part into compartments by partition walls.
  • the flotation cell is described as being a rectangular or trapeziform elongated trough the bottom of which slopes away from the point at which the feed is introduced.
  • the froth is removed by rotating paddles located at the top of the flotation cell.
  • U.S. Patent No. 2,350,943 discloses a counter­current froth flow flotation system where the froth is caused to flow from the tailing end of the flotation apparatus towards the feed end. Concomitantly, the tailings are caused to flow counter to the flow of the froth and are discharged at the opposite end of the pulp body.
  • the apparatus is comprised of a plurality of individual flotation cells arranged together in series to form a multiple cell unit in which free communication among the constituent cells, as well as a common pulp level are maintained, while at the same time the cells are operatively distinct one from another.
  • U.S. Patent No. 2,l84,ll5 discloses an apparatus for flotation concentration of ores comprising a plurality of cells interconnected to permit the flow of concentrates from one cell to another and the counterflow of middlings and tailings from one cell to another.
  • the middlings and tailings pass through pipes connecting the various cells.
  • coal is first cleaned of rock and the like, and is then pulverized to a fine size of about 48 to 300 mesh.
  • the extended surfaces of the ground coal particles are then rendered hydrophobic and oleophilic by a polymerization reaction.
  • the sulfur and mineral ash impurities present in the coal remain hydrophilic and are separated from the treated coal product in a water washing step.
  • This step utilizes oil and water separation techniques, and the coal particles made hydrophobic can float in recovery on a water phase which contains hydrophilic impurities.
  • Another object of this invention is to provide an improved method and apparatus for beneficiating coal by a froth flotation separation of particulate coal from impuri­ties associated therewith such as ash and sulfur.
  • Still another object of the present invention is to provide a method and apparatus for froth flotation separation of a slurry of particulate matter which is simpler, less expensive, more efficient and moreover provides improved yields of clean product.
  • the apparatus and method of the present invention are adapted to the separation of a wide variety of solid-fluid streams by the creation of a solids containing froth phase and is suitable for the separation of many types of particulate matter.
  • U.S. Patent Nos. 4,304,573 and 4,4l2,843, incorporated herein by reference may be referred to for further details on the chemical treating processes which are particularly useful in conjunction with the present invention.
  • the flotation tanks are not independent from each other but combined into one large tank having a hydraulically commuting inclined common bottom for the slurry at each cell.
  • the collection and transportation of coal laden tailings in the counterflow stream into the scavenger tank is more efficient than in previous methods.
  • a common sloped bottom extends under all of the beneficiation compartments or cells, as shown in Figs. l and 3.
  • the common bottom which extends under all the beneficiation cells is sloped downwardly towards the point at which the input slurry enters the tank.
  • Fig. l schematically illustrates a preferred embodiment of the present invention having a flotation tank 5 comprised of three cells filled with water to a level 6.
  • Flotation tank 5 is generally trapezoidal in shape having a bottom which slopes toward the end of the tank where the input slurry is fed.
  • a slurry of finely ground coal particles, associated impurities, and additives and reagents, if desired, such as monomeric compounds, chemical initiators, catalysts and fluid hydrocarbon carriers are initially fed, e.g., from a ball mill, to a coal slurry feed tank 7 and then sprayed into flotation tank 5 through at least one primary spray nozzle 8 positioned at a spaced apart distance above the water level 6 in tank 5.
  • two or more primary nozzles can be used to spray slurry and/or any other desired ingredients into the cells of flotation tank 5.
  • Preferred types of spray nozzles utilized herein are, for example, the spiral or helix open flow spray nozzles disclosed in U.S. Patent No. 4,5l4,29l incorporated by reference herein or the full jet spray nozzles for example as disclosed in U.S. Patent No. 4,347,l26, or U.S. Patent No. 4,347,l27 also incorporated by reference herein.
  • the stream of treated coal is pumped under pressure to the primary spray nozzle 8 wherein the resultant shearing forces spray the coal flocculent slurry as fine droplets such that they are forcefully jetted into the mass of continuous water bath in cell No. l creating a froth 2 on the liquid surface having a substantial quantity of particulate matter floating therein, while other components of the slurry and a minor quantity of particulate matter sink in the liquid bath.
  • Fig. 2 is a section of the apparatus of Fig. l taken along lines A-A. While Fig. 2 is a sectional view taken through cell No. l, Fig. 2 is also representative of the same sectional view taken through cell No. 2 and cell No. 3. As shown in Fig. 2, an upwardly inclined and curved surface l8 extends from the water surface at skimmer l6 to collection chute 2l in the cell for the draining of excess (and laden) water from the froth before it is discharged into froth collect tank l7.
  • the froth which is discharged from the first cell into froth collect tank l7 is generally diluted and mixed with water from spray nozzle 40 before being pumped and sprayed through primary nozzle l9 into the liquid surface of cell No. 2 for additional cleaning.
  • Cell No. 2 (as well as cell No. 3) is like cell No. l and the operation in cell No. 2 (as well as cell No. 3) is similar to that which occurs in cell No. l.
  • the froth from cell No. 2 collected in a froth collect tank like tank l7 is then pumped and sprayed through primary nozzle 20 into the liquid surface of cell No.
  • Flotation tank 5 is divided in its upper part into the various cells by partitions 30 and 3l.
  • the partitions 30 and 3l extend vertically into the tank but as shown do not extend completely to the bottom thereby providing the common communicating bottom ll.
  • a typical beneficiation cell in accordance with the present invention is shown in Fig. 2.
  • Fig. 2 is a section taken from Fig. l along the line A-A through cell No. l, as indicated.
  • the primary spray nozzle 8 positioned above the liquid bath in the cell, sprays an input slurry of particulate matter through an aeration zone into the liquid surface.
  • the spraying operation creates a froth 2 on the liquid surface having a substantial quantity of particulate matter floating therein, while other components of the slurry and a minor quantity of particulate matter sink in the liquid bath.
  • a collector trough 33 is positioned in the cell.below the primary spray nozzle 8 for collecting the sinking materials. The collected materials are then recycled to at least one recycle spray nozzle 4 positioned in proximity to the primary spray nozzle(s) 8 of the cell.
  • a verticle baffle l5 is positioned between the primary and recycle nozzles to provide separation for materials sinking from the sprays of the respective nozzles.
  • the froth 2, produced in the cell, is discharged by skimmer paddle l6 through chute 2l and into the froth collection tank l7.
  • the primary and recycle spray nozzles, 8 and 4 are preferably inclined from a vertical in the direction in which the skimmer paddle l6 operates to direct the flow of froth in that direction along the liquid surface.
  • the froth which is discharged from the first cell into tank l7, is diluted and mixed with water before being pumped and sprayed into the liquid surface of the second cell for additional cleaning.
  • the final (third) stage cleaning of the froth is accomplished in the cell No. 3, after which the clean coal froth product is transferred for drying and fuel blending.
  • the tailings are removed in a counterflow stream l0, flowing in opposite direction of the froth, at the hydraulically communicating common bottom ll of the tank as shown in Figs. l-3.
  • the rate of flow of water added to the system at location 25 as shown in Fig. l must be controlled so as to prevent any back-flow of the pulp from cell No. l to cell No. 2, and from cell No. 2 to cell No. 3, that is, to exchange liquid in the direction of the counterflow stream as shown, so that the greater ash content of pulp in cell No. l does not contaminate the pulp in cell No. 2, and the pulp in cell No. 2 does not contaminate the pulp in cell No. 3.
  • the velocity of the counterflow at the bottom of the tank must be sufficient to prevent settling of the tailings in conduit ll.
  • a froth flotation apparatus utilizing at least two and preferably three beneficiation cells are used side by side with a hydraulically communicating common bottom of liquid under all the cells.
  • the arrangement permits the use of one tank level control, which is common for all of the cells.
  • controlled flow of water is introduced to the system to produce a counterflow stream pattern under the cells by which the greater ash content of pulp in the first cell cannot contaminate the pulp in the second cell.
  • the higher ash content of pulp in the second cell cannot contaminate the same in the third cell.
  • the counterflow stream is sufficient to prevent any settling of the tailings at the tank bottom.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Water Treatments (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Processing Of Solid Wastes (AREA)
EP86113124A 1985-11-27 1986-09-24 Verfahren und Vorrichtung zur Schaumflotation Ceased EP0229224A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80309985A 1985-11-27 1985-11-27
US803099 1985-11-27

Publications (2)

Publication Number Publication Date
EP0229224A2 true EP0229224A2 (de) 1987-07-22
EP0229224A3 EP0229224A3 (de) 1989-06-14

Family

ID=25185577

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113124A Ceased EP0229224A3 (de) 1985-11-27 1986-09-24 Verfahren und Vorrichtung zur Schaumflotation

Country Status (7)

Country Link
EP (1) EP0229224A3 (de)
JP (1) JPS62129162A (de)
AU (1) AU601698B2 (de)
DK (1) DK568886A (de)
FI (1) FI79792C (de)
NO (1) NO864739D0 (de)
ZA (1) ZA867415B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282538A (en) * 1990-10-31 1994-02-01 Multotec Cyclones (Proprietary) Limited Flotation column
US5338338A (en) * 1992-09-22 1994-08-16 Geobiotics, Inc. Method for recovering gold and other precious metals from carbonaceous ores
US5364453A (en) * 1992-09-22 1994-11-15 Geobiotics, Inc. Method for recovering gold and other precious metals from carbonaceous ores
WO1999015278A1 (en) * 1997-09-19 1999-04-01 Valmet Corporation Apparatus for cleaning a suspension, preferably a fiber mass suspension
WO2007082317A3 (en) * 2006-01-15 2007-09-13 Mintek Flotation test apparatus
CN103391900A (zh) * 2010-12-21 2013-11-13 Fl史密斯公司 浮选机、泡沫回收设备和用于回收材料的方法
CN108355825A (zh) * 2018-02-08 2018-08-03 华中科技大学 一种油茶果预处理浮选机及方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA905849B (en) * 1989-07-26 1991-05-29 Univ Newcastle Res Ass A method of operating a plurality of minerals separation flotation cells
JP5455392B2 (ja) * 2009-02-17 2014-03-26 太平洋セメント株式会社 塩素バイパスダストの処理方法
CN107520067A (zh) * 2017-01-25 2017-12-29 卢元伟 一种自流槽式节能高效浮选设备

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416066A (en) * 1944-05-19 1947-02-18 Donald S Phelps Froth flotation cell
US2765081A (en) * 1953-06-19 1956-10-02 Commw Scient Ind Res Org Recovery of wool wax
US2999595A (en) * 1956-07-02 1961-09-12 Saskatchewan Potash Apparatus for flotation concentration in coarse size range
US3351199A (en) * 1964-09-21 1967-11-07 A Z Products Inc Apparatus for froth flotation
FR2248086B1 (de) * 1973-10-22 1978-03-24 Erpac
US4347127A (en) * 1981-01-29 1982-08-31 Gulf & Western Manufacturing Company Apparatus and method for froth flotation separation of the components of a slurry
AU546684B2 (en) * 1981-01-29 1985-09-12 Gulf & Western Industries Inc. Froth flotation

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282538A (en) * 1990-10-31 1994-02-01 Multotec Cyclones (Proprietary) Limited Flotation column
US5338338A (en) * 1992-09-22 1994-08-16 Geobiotics, Inc. Method for recovering gold and other precious metals from carbonaceous ores
US5364453A (en) * 1992-09-22 1994-11-15 Geobiotics, Inc. Method for recovering gold and other precious metals from carbonaceous ores
US5443621A (en) * 1992-09-22 1995-08-22 Giobiotics, Inc. Method for recovering gold and other precious metals from carbonaceous ores
US5626647A (en) * 1992-09-22 1997-05-06 Geobiotics, Inc. Method for recovering gold and other precious metals from carbonaceous ores
US5792235A (en) * 1992-09-22 1998-08-11 Geobiotics, Inc. Method for recovering gold and other precious metals from carbonaceous ores
WO1999015278A1 (en) * 1997-09-19 1999-04-01 Valmet Corporation Apparatus for cleaning a suspension, preferably a fiber mass suspension
US6182478B1 (en) 1997-09-19 2001-02-06 Valmet Corporation Apparatus for cleaning a suspension, preferably a fiber mass suspension
WO2007082317A3 (en) * 2006-01-15 2007-09-13 Mintek Flotation test apparatus
CN103391900A (zh) * 2010-12-21 2013-11-13 Fl史密斯公司 浮选机、泡沫回收设备和用于回收材料的方法
EP2655267A4 (de) * 2010-12-21 2014-09-03 Smidth As F L Flotationsvorrichtung, schaumrückgewinnungsvorrichtung und verfahren zur rückgewinnung von materialien
CN108355825A (zh) * 2018-02-08 2018-08-03 华中科技大学 一种油茶果预处理浮选机及方法

Also Published As

Publication number Publication date
JPS62129162A (ja) 1987-06-11
ZA867415B (en) 1988-05-25
DK568886D0 (da) 1986-11-26
AU6304786A (en) 1987-06-04
FI79792C (fi) 1990-03-12
FI864144L (fi) 1987-05-28
FI864144A0 (fi) 1986-10-14
EP0229224A3 (de) 1989-06-14
DK568886A (da) 1987-05-28
NO864739D0 (no) 1986-11-26
AU601698B2 (en) 1990-09-20
FI79792B (fi) 1989-11-30

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