EP1020227A1 - Zentrifuge zur nassmechanischen Trennung von Feststoffgemischen - Google Patents

Zentrifuge zur nassmechanischen Trennung von Feststoffgemischen Download PDF

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Publication number
EP1020227A1
EP1020227A1 EP00100957A EP00100957A EP1020227A1 EP 1020227 A1 EP1020227 A1 EP 1020227A1 EP 00100957 A EP00100957 A EP 00100957A EP 00100957 A EP00100957 A EP 00100957A EP 1020227 A1 EP1020227 A1 EP 1020227A1
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EP
European Patent Office
Prior art keywords
discharge
centrifuge
phase
sinks
shell part
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Withdrawn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
EP00100957A
Other languages
English (en)
French (fr)
Inventor
Michael Ismar
Klaus Bermward Feldkamp
Karl-Heinz Dr. Unkelbach
Reinhard Kluge
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.)
Baker Hughes Deutschland GmbH
Original Assignee
Baker Hughes Deutschland GmbH
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 Baker Hughes Deutschland GmbH filed Critical Baker Hughes Deutschland GmbH
Publication of EP1020227A1 publication Critical patent/EP1020227A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • 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
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2041—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with baffles, plates, vanes or discs attached to the conveying screw

Definitions

  • This invention pertains to a centrifuge for the wet mechanical separation of a solids mixture in a fluid suspension into heavy phase sinks, light phase floats, and a third phase, said centrifuge including a cylindrical basket shell part that connects on at least one end to a conical basket shell part, an axial feed for the suspension, a discharge for the heavy phase sinks, a discharge for the light phase floats and a discharge for a third phase that contains the suspension fluid, said centrifuge further including an immersion disk for preventing the floats from remixing with the suspension.
  • the separating/sorting of solid mixtures in particular, the separating/sorting of comminuted and contaminated used plastic mixtures into fractions of different density in a separating fluid of such a density that floats and sinks are obtained, is known from, for example, U.S. Patent No. 5,342,281 and DE-A 195 16 636.
  • the separating fluid as well as the solid particles suspended in the fluid rotate in the centrifugal field of a biconical solid basket screw-type centrifuge.
  • the solid particles e.g., mineral impurities, PVC, etc., whose density is greater than that of the fluid, e.g., water, are forced radially outward toward the centrifuge shell and transported to the discharge openings at one end of the centrifuge via the sinks cone and by means of the helical screw part for sinks.
  • the distinctly lighter components e.g. the polyolefins PE, PP, etc., float inward and are transported to the discharge openings at the other end of the centrifuge via the floats cone and by means of the oppositely rotating helical screw part for floats.
  • the separating fluid which no longer contains sinks and floats is discharged from the centrifuge via an overflow system and can be recirculated into the axial centrifuge inlet.
  • This known biconical solid basket screw-type centrifuge represents a sorting centrifuge that is not suitable for separating fine-grained materials into grain classes in a highly selective fashion, in particular, a precise grain classification in small increments on the order of, for example, a few ⁇ m.
  • DE-A 31 34 935 describes a three-phase decanting centrifuge or screw-type centrifuge that is, for example, able to separate an olive oil/fruit pulp/water mixture into olive oil as the distinctly light liquid phase, water as the heavy liquid phase and solids as the heaviest phase.
  • a precise grain classification is not possible with this decanting centrifuge.
  • U.S. Patent No. 5,234,400 describes a solid basket screw-type centrifuge that is suitable for a precise grain classification in small increments of a few ⁇ m.
  • This centrifuge is used, for example, for colloidal suspensions of kaolin, pigments, etc., namely for obtaining certain grain classes from a grain spectrum.
  • the suspension is axially fed into the cylindrical basket shell part at one end of the centrifuge, and the heavy (coarse grain) phase as well as the light (fine grain) phase flow in a co-current flow to the product discharge at the other end of the centrifuge with the conical basket shell part.
  • the coarse grain product is discharged by means of nozzle-shaped discharge openings in the basket shell, and the fine grain product is discharged farther radially inward at the end of the conical basket shell part.
  • the discharge openings for the fine grain product are, viewed in the flow direction of the suspension, arranged at a distance behind the discharge openings for the coarse grain product.
  • the discharge of a third phase does not take place with this known classifying centrifuge.
  • a fine pigment material e.g., fine-grained calcium carbonate
  • Processing stages which are carried out before the classification e.g., grinding processes, as well as abrasion of the transport belt, etc. cause impurities, such as rubber, wood residues, plant residues, etc., to be introduced into the suspension of a classifying centrifuge.
  • impurities whose density is frequently lower than the specific density of the suspension, had to be separated from the material with processes carried out before the classifying stage by means of complicated sorting techniques.
  • the present invention is based on the objective of developing a centrifuge that is not only able to classify fine-grained materials with certain grain spectrums in very small increments, but is also suitable for carrying out a sorting process simultaneously with the classifying process in one and the same machine so as to allow the separation of solid impurities, in particular, from the fine grains to be obtained.
  • the centrifuge according to the present invention represents a combination of a sorting centrifuge and a classifying centrifuge.
  • the sorting zone of the centrifuge according to the invention extends from the immersion disk that is immersed into the suspension fluid and rotates with the conveyor screw to the floats discharge at one end of the centrifuge.
  • the classifying zone extends diametrically opposite from the immersion disk to the other end of the centrifuge.
  • the supplied material namely a fine-grained, ground solid with a certain grain spectrum, e.g., calcium carbonate, which is contaminated, e.g., due to the abrasion of rubber on the transport belt, is suspended, e.g., in water and introduced into the sorting zone of the centrifuge according to the invention.
  • the supplied suspension may have a density of, for example, 1.6 g/cm 3 .
  • the distinctly lighter impurities e.g., rubber particles with a density of, for example, 1.3 g/cm 3
  • a conveying element e.g., the helical screw of a conveyor screw for floats.
  • the immersion disk prevents the floating impurities from remixing with the classifying suspension.
  • the suspension that flows into the classifying zone underneath the immersion disk is free of impurities.
  • the solid suspension e.g., the calcium carbonate
  • the coarse grain can be transported to the coarse grain discharge in the form of sinks by the helical screw of the conveyor screw for sinks, while the classified fine or finest grain remains in the suspension fluid and is discharged with the suspension as a third phase, e.g., by means of a system of overflow pipes, skimming pipes, skimming disks, etc.
  • the present invention allows a precise grain classification as well as the separation of interfering impurities in one and the same centrifuge so that prior cleaning stages like screens or other sorting techniques can be eliminated.
  • the sorting process in particular, the separation of impurities, does not interfere with the precise grain classification, which simultaneously takes place in the centrifuge.
  • Fig. 1 shows a longitudinal section through the rotor of the centrifuge according to the present invention that, for example, is designed in accordance with a biconical solid basket screw-type centrifuge with a cylindrical basket shell part 10 that connects at each end to a corresponding conical basket shell part 11 and 12, respectively.
  • a rotatable conveyor screw is positioned coaxially in the rotatable centrifuge basket. This conveyor screw rotates in the centrifuge basket with a differential rotational speed and contains a helical screw 13 for floats in the left longitudinal region and a helical screw 14 for sinks that rotates in the opposite direction in the right longitudinal region.
  • the supplied suspension 16 e.g., a fine-grained material, which is contaminated with rubber, plastic, etc.
  • the suspension of the grain spectrum from which at least one finest grain fraction that is free of contaminants should be obtained, is introduced into the centrifuge basket through at least one hollow shaft opening 17 into the sorting zone A, which is separated from an adjacent classifying zone B by an immersion disk 18 that rotates with the conveyor screw 15 and is immersed in the suspension.
  • the distinctly lighter impurities contained in the supplied material float to the surface very rapidly in the sorting zone A due to the difference in density between the supplied suspension and the impurities under the influence of the centrifugal field.
  • These floats 19 are lifted out of the suspension fluid by the conical basket shell part 11 and transported to the floats discharge openings 20 by the helical screw 13.
  • the floats are removed from the centrifuge basket in the form of separately obtained impurities 21 at these discharge openings.
  • the product 21 can be transported to additional processing stations.
  • the heavy particles of the ground material contained in the suspension e.g., calcium carbonate with a density of approximately 2.6 g/cm 3
  • These sinks 22 flow into the classifying zone B of the centrifuge together with the suspension fluid underneath the immersion disk 18, which prevents the floats 19 from remixing with the classifying suspension.
  • a highly selective precise grain classification in small increments on the order of a few ⁇ m takes place in a co-current flow.
  • the sinks 22 are transported through the classifying zone B by the helical screw 14 for sinks, which transports material in the opposite direction than the helical screw 13 for floats.
  • the coarse grain is lifted out of the suspension fluid on the conical basket shell part 12 and transported to the sinks discharge openings 23, where coarse grain 24 with a grain size of, for example, >40 ⁇ m is discharged from the centrifuge basket by the helical screw 14.
  • this discharge is realized by means of several overflow pipes 26 that are distributed over the periphery. The radially inner openings of these overflow pipes make it possible to vary and maintain a constant level of the separating fluid in the centrifuge basket.
  • This fine grain discharge 25, 26 is arranged approximately at the transition from the cylindrical basket shell part 10 to the conical basket shell part 12 for the discharge of sinks in the embodiment shown.
  • the classifying effect for the respective grain spectrum to be classified can be influenced, if necessary, by designing the helical screw 14 for sinks in the conical basket shell 12 with a different pitch than in the cylindrical basket shell part 10.
  • the pipes 26 are realized in the form of nozzle-shaped discharge openings for discharging the coarse-grained solid which are arranged in the basket shell, where the fine-grained solid is discharged together with the suspension fluid at the discharge openings 23 in this case.
  • the cylindrical basket shell part 10 has a length that is preferably smaller than approximately 5 times the basket shell diameter.
  • the axial length of the conical basket shell part 12 with the sinks discharge may differ from the axial length of the conical basket shell part 11 with the floats discharge.
  • the cone angle of the conical basket shell parts 11 and 12 can be, for example, ⁇ 12°.
  • systems for mixing the suspension can be provided within the classifying zone B.
  • the biconical solid basket screw-type centrifuge according to the present invention is not only suitable for classifying grain spectrums so as to obtain at least one grain class of a ground solid, but also for dewatering or the separation of solids and liquids in sludges that contain materials that can be separated from the sinks separately as a third phase in the form of floats.

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  • Centrifugal Separators (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP00100957A 1999-01-18 2000-01-18 Zentrifuge zur nassmechanischen Trennung von Feststoffgemischen Withdrawn EP1020227A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19901655 1999-01-18
DE1999101655 DE19901655A1 (de) 1999-01-18 1999-01-18 Zentrifuge zur naßmechanischen Trennung von Feststoffgemischen

Publications (1)

Publication Number Publication Date
EP1020227A1 true EP1020227A1 (de) 2000-07-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00100957A Withdrawn EP1020227A1 (de) 1999-01-18 2000-01-18 Zentrifuge zur nassmechanischen Trennung von Feststoffgemischen

Country Status (3)

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EP (1) EP1020227A1 (de)
CA (1) CA2296164A1 (de)
DE (1) DE19901655A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7153255B2 (en) * 2002-03-20 2006-12-26 Hiller Gmbh Screw centrifuge for the wet mechanical separation of solids
GB2493600A (en) * 2011-06-27 2013-02-13 James Alexander Donaldson Apparatus and methods for recovering polyolefin plastic
EP3238828A1 (de) * 2016-04-26 2017-11-01 Andritz Technology and Asset Management GmbH Schneckenzentrifuge zur nassmechanischen trennung von feststoffen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108579612B (zh) * 2018-02-05 2023-10-13 中国寰球工程有限公司 用于挤压造粒机开车排料的处理系统
CN112676050B (zh) * 2020-09-25 2023-01-03 乌拉特中旗浩通清洁能源有限公司 一种煤泥分选系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037781A (en) * 1975-04-01 1977-07-26 Pennwalt Corporation Decanter centrifuge apparatus
DE4222119A1 (de) * 1992-07-06 1994-01-13 Kloeckner Humboldt Deutz Ag Vorrichtung und Verfahren zur naßmechanischen Aufbereitung von Feststoffen
US5342281A (en) * 1992-01-31 1994-08-30 Kloeckner-Humboldt-Deutz Ag Apparatus and method for wet-mechanical processing of solids
DE19516636A1 (de) * 1994-05-05 1996-02-15 Flottweg Gmbh Sorticanter
DE19701669A1 (de) * 1997-01-18 1998-07-23 Kloeckner Humboldt Wedag Verfahren und Anlage zur Aufbereitung von kunststoffreichen Müllgemischen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1843187U (de) * 1961-10-28 1961-12-07 Krauss Maffei Ag Zentrifuge zum trennen der fluessigkeit vom feststoff aus schlaemmen, insbesondere abwasserschlaemmen.
BE638716A (de) * 1962-10-16
DE1782428A1 (de) * 1968-08-30 1971-09-02 Kloeckner Humboldt Deutz Ag Vollmantel-Schneckenzentrifuge
DE3921328A1 (de) * 1989-06-29 1991-01-10 Kloeckner Humboldt Deutz Ag Verfahren und vorrichtung zur nachbehandlung des dickstoffes im dickstoffaustragsbereich einer vollmantel-schneckenzentrifuge
DE4115347C2 (de) * 1991-05-10 1999-07-22 Baker Hughes De Gmbh Vollmantel-Schneckenzentrifuge zur Klassierung eines Feststoff-Flüssigkeitsgemisches

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037781A (en) * 1975-04-01 1977-07-26 Pennwalt Corporation Decanter centrifuge apparatus
US5342281A (en) * 1992-01-31 1994-08-30 Kloeckner-Humboldt-Deutz Ag Apparatus and method for wet-mechanical processing of solids
DE4222119A1 (de) * 1992-07-06 1994-01-13 Kloeckner Humboldt Deutz Ag Vorrichtung und Verfahren zur naßmechanischen Aufbereitung von Feststoffen
DE19516636A1 (de) * 1994-05-05 1996-02-15 Flottweg Gmbh Sorticanter
DE19701669A1 (de) * 1997-01-18 1998-07-23 Kloeckner Humboldt Wedag Verfahren und Anlage zur Aufbereitung von kunststoffreichen Müllgemischen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7153255B2 (en) * 2002-03-20 2006-12-26 Hiller Gmbh Screw centrifuge for the wet mechanical separation of solids
GB2493600A (en) * 2011-06-27 2013-02-13 James Alexander Donaldson Apparatus and methods for recovering polyolefin plastic
EP3238828A1 (de) * 2016-04-26 2017-11-01 Andritz Technology and Asset Management GmbH Schneckenzentrifuge zur nassmechanischen trennung von feststoffen
US10213791B2 (en) * 2016-04-26 2019-02-26 Andritz Technology And Asset Management Gmbh Screw centrifuge with auxiliary outer screw flight for wet mechanical separation of solids

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Publication number Publication date
DE19901655A1 (de) 2000-07-20
CA2296164A1 (en) 2000-07-18

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