EP3238828B1 - Schneckenzentrifuge zur nassmechanischen trennung von feststoffen - Google Patents

Schneckenzentrifuge zur nassmechanischen trennung von feststoffen Download PDF

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Publication number
EP3238828B1
EP3238828B1 EP17159643.0A EP17159643A EP3238828B1 EP 3238828 B1 EP3238828 B1 EP 3238828B1 EP 17159643 A EP17159643 A EP 17159643A EP 3238828 B1 EP3238828 B1 EP 3238828B1
Authority
EP
European Patent Office
Prior art keywords
screw
solids
flight
flights
floating
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.)
Active
Application number
EP17159643.0A
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German (de)
English (en)
French (fr)
Other versions
EP3238828C0 (de
EP3238828A1 (de
Inventor
Stefan Klimenta
Johann Franc
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.)
Andritz Technology and Asset Management GmbH
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Andritz Technology and Asset Management GmbH
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Publication date
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Publication of EP3238828A1 publication Critical patent/EP3238828A1/de
Application granted granted Critical
Publication of EP3238828C0 publication Critical patent/EP3238828C0/de
Publication of EP3238828B1 publication Critical patent/EP3238828B1/de
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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
    • B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • 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
    • 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
    • B04B2001/205—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 special construction of screw thread, e.g. segments, height
    • 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
    • B04B2001/2058—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 ribbon-type screw conveyor

Definitions

  • the invention relates to a screw centrifuge for the wet mechanical separation of solids according to their density with a rotating cylindrical drum with two conical drums connected to it and openings for the discharge of the separated substances as sinking material and floating material and the separation liquid, and a rotating shaft with openings for the introduction of the solids to be separated, wherein a baffle plate is arranged on the shaft in the axial direction between the introduction opening for the substances to be separated and the discharge opening for the sinking material, and the shaft has two screws, one for the sinking material and one for the floating material, wherein the screw for the sinking material has a helix for transporting the sinking material to the opening for the discharge of the sinking material.
  • Such screw centrifuges are known for example from EP 0 553 793 B1 known.
  • the EP 1 020 227 A1 also discloses a screw centrifuge according to the preamble of claim 1, wherein the region between the baffle plate and the opening for the discharge of a third phase is designed as a classification zone.
  • Such machines are limited in their throughput for the light or floating material. If the established throughput is increased, the machine blocks the product.
  • Other similar machines are available from the DE 195 16 636 A1 or the EP 1 485 205 B1 Such machines are used for a 3-phase separation of mixtures of substances, e.g. different plastic fractions and a separating liquid. By choosing the right density of the separating liquid, several different fractions can be separated in multi-stage processes.
  • the DE 3134935 A1 a decanter centrifuge for the separation of a solid phase and two liquid phases. Separation of light material or floating material is not possible here. The decanter centrifuge of the DE 2612696 does not allow the separation of floating material.
  • US 2528974 describes a centrifugal separator for the separation of solids and liquids, which also does not allow three-phase separation.
  • the spiral separator of the US4781822 separates two types of particles according to density and size.
  • the aim of the invention is therefore to achieve better separation and higher throughput in a three-phase separation.
  • the invention is therefore characterized in that the screw for the floating material is designed as a multi-start screw and has spirals for transporting the floating material to the opening for the discharge of the floating material, the screw for the sinking material comprises an external spiral which is designed as a parallel spiral, wherein the parallel spiral consists of one or more additional narrow band spirals, the outer spiral overlaps with the inner spirals of the screw for the floating material, the outer spiral is arranged parallel to the spiral for transporting the sinking material around the spirals for transporting the floating material, with the outer spiral being connected to the spirals for transporting the floating material at different points and the spirals running in opposite directions.
  • the throughput can be increased significantly with the same separation quality and residual product moisture, and a significant reduction in clogging/blocking of the machine is also achieved despite higher throughputs.
  • a favorable embodiment of the invention is characterized in that the screw spiral for the sinking material reaches up to the drum and the screw spiral for the floating material has a smaller outer diameter than the inner diameter of the screw spiral of the screw for the sinking material. Due to this measure and the counter-rotation of the two screws, the light material that floats on the separating liquid can be transported by the inner spiral to the light material discharge, while the heavy material sinks, collects on the drum wall and is transported by the outer spiral to the opposite discharge. The separating liquid is separated separately via nozzles.
  • a favorable development of the invention is characterized in that the part of the cover of the screw spiral for the sinking material is directly connected, preferably welded, to the spiral for the floating material. This means that no additional supports are required that could impair the path of the separated material.
  • the screw for the sinking material is designed as a multi-start screw. With a suitable choice of threads and pitch, the total capacity of a screw can be increased.
  • the amount of product conveyed by each spiral flight (the product "pile" in front of the spiral) is significantly reduced compared to a single-flight spiral. This supports the stability of the process, the separation of the product fractions, the transport of the respective fraction and the separation from the separation medium with significantly increased product throughputs.
  • the separation device 10 consists of a cylindrical drum 11 that is conical at both ends. Inside the drum 11 there is a two-part conveyor screw 12 with screw flights 13 for discharging the sinking material 16 and with screw flights 23 for discharging the floating material 17.
  • the screw flights e.g. outer diameter, counter-rotating flights
  • the sinking material 16 and the floating material 17 are transported to oppositely arranged discharge openings 14, 15: the sinking material 16 to one or more discharge openings 14, the floating material 17 to one or more discharge openings 15.
  • the separation liquid 18 separated from the sinking material and the floating material is discharged via one or more nozzles 19 on the heavy material side of the separation device 10.
  • a baffle plate 20 prevents the floating material 17 from being caught by the spirals 13 for the sinking material 16 during the separation process and from reaching the sinking material discharge 14.
  • the mixture of solids and separation liquid to be separated is fed into the interior of the container via an axially arranged feed pipe 21 through one or more feed openings 22.
  • the mixture for example suspension
  • the conveyor screw 12 is usually driven at a speed that differs from the drum speed.
  • the solids Due to the difference in density between the solids and the separation liquid, the solids are separated within a short time, with the light solid (floating material 17) settling on the surface of the separation liquid 18 and the heavy solid (sinking material 16) sinking to the inner surface of the drum 11.
  • the floating material is now captured by the screw spiral 23 and conveyed to the discharge opening 15, the sinking material 16 is captured by the screw spiral 13, conveyed to the discharge opening 14 and, as a result of the conical shape of the outer surface of the drum 11, is lifted out of the separating liquid and conveyed out of the drum 11 via the discharge opening 14.
  • the conical part of the drum 11 in the area of the discharge opening 15 facilitates the separation of the floating material 17 from the separating liquid 18.
  • Fig. 2 now shows a screw centrifuge according to the invention, whereby an analogous representation to Fig. 1 was selected. Identical parts are identified by the same reference numerals as in Fig. 1
  • This extension consists of one or more additional narrow (band) spiral(s) 13', which is arranged parallel to the spiral 13 around the spiral 23 (and 23') for the floating material 17.
  • the counter-rotation results in better separation of the solids.
  • the spiral(s) 13, 13' is or are connected to the spirals 23, 23' at various points, e.g. welded.
  • the screw spiral 23, 23' for the floating material 17 is designed with two flights, which enables better conveying and thus a higher throughput to be achieved.
  • the product to be processed is often plastic mixtures of different densities that are to be separated into floating and sinking material fractions. Depending on the application, the separation leads to a separation selectivity of well over 99% of the individual fractions.
  • fiber materials such as carpet scraps made of polypropylene, polyamide and latex, among others, can be separated in a two-stage process and thus recycled.
  • the separated solids are also subjected to a certain degree of washing during the separation process before they are discharged.
  • the two screw spiral groups for sinking and floating material can also be installed with different pitches as required for the process, which means that the machine can be perfectly tailored to the process.
  • Fig. 3 is a cut through Fig. 2 along the line III-III. It shows a section through the individual screw flights.
  • the upper part shows the section through the first flight 23 of the screw 12 for separating the floating material 17.
  • the lower part shows a section through the second flight 23' for the floating material.
  • additional screw flights can also be used, so that the screw then has three or more screw flights if necessary.
  • the flight 13' for the sinking material 16 is shown on the outer circumference. With a single-flight flight for the sinking material 16, only the flight 13' appears as shown in the upper part. With a two-flight flight, the flight 13" is also present, as shown in the lower part of the drawing.
  • the invention is not limited to the examples in the drawings.
  • the edges of the spirals can also be protected from excessive wear by wearing parts.
  • the invention relates to a screw centrifuge for wet mechanical separation of solids according to their density, which comprises a rotating cylindrical drum with two conical drums connected thereto, with openings for the discharge of the separated materials as sinking material and floating material and the separation liquid, and a rotating shaft with openings for the introduction of the solids to be separated, the shaft having two counter-rotating screw flights, a baffle plate being arranged on the shaft in the axial direction between the inlet opening for the materials to be separated and the discharge opening for the sinking material.
  • the outer flight of the screw for the sinking material overlaps with the inner single or multi-flight flight of the screw for the floating material, the flights rotating in opposite directions.
  • the outer flight of the screw for the sinking material can also be multi-flight. This makes it possible to achieve a particularly high throughput while maintaining high selective separation and the same low residual moisture.
  • the invention also relates to a conveyor screw for such a screw centrifuge.

Landscapes

  • Centrifugal Separators (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP17159643.0A 2016-04-26 2017-03-07 Schneckenzentrifuge zur nassmechanischen trennung von feststoffen Active EP3238828B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA50367/2016A AT518275B1 (de) 2016-04-26 2016-04-26 Schneckenzentrifuge zur nassmechanischen trennung von feststoffen

Publications (3)

Publication Number Publication Date
EP3238828A1 EP3238828A1 (de) 2017-11-01
EP3238828C0 EP3238828C0 (de) 2025-01-08
EP3238828B1 true EP3238828B1 (de) 2025-01-08

Family

ID=58261596

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17159643.0A Active EP3238828B1 (de) 2016-04-26 2017-03-07 Schneckenzentrifuge zur nassmechanischen trennung von feststoffen

Country Status (5)

Country Link
US (1) US10213791B2 (enrdf_load_stackoverflow)
EP (1) EP3238828B1 (enrdf_load_stackoverflow)
JP (1) JP6840011B2 (enrdf_load_stackoverflow)
AT (1) AT518275B1 (enrdf_load_stackoverflow)
CA (1) CA2963405C (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT518275B1 (de) 2016-04-26 2017-09-15 Andritz Tech And Asset Man Gmbh Schneckenzentrifuge zur nassmechanischen trennung von feststoffen
CN110935553B (zh) * 2019-11-29 2025-07-08 云南焠金时代科技有限公司 一种圆环形盘式选矿机及选矿方法
WO2023069787A1 (en) * 2021-10-22 2023-04-27 Valerio Thomas A Method and system for waste separation using a multi-spiral separator

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2528974A (en) * 1945-09-19 1950-11-07 Process Dev Company Method and apparatus for centrifugal separation
US2919848A (en) * 1956-03-14 1960-01-05 Andrew F Howe Centrifugal separation
DE2612696A1 (de) * 1975-04-01 1976-10-14 Pennwalt Corp Vollmantel-dekantierzentrifuge
DE3134935A1 (de) * 1980-09-09 1982-06-09 Alfa-Laval Separation A/S, 2860 Soeborg "mitstrom-dekanterzentrifuge"
US4781822A (en) * 1985-08-08 1988-11-01 Minpro Pty. Limited Spiral separator
DE4208104A1 (de) * 1992-01-31 1993-08-05 Kloeckner Humboldt Deutz Ag Vorrichtung und verfahren zur nassmechanischen aufbereitung von feststoffen
DE4222119C2 (de) * 1992-07-06 1997-07-10 Deutz Ag Vorrichtung und Verfahren zur naßmechanischen Trennung von Feststoffgemischen
DE4305346A1 (de) * 1993-02-20 1994-08-25 Kloeckner Humboldt Deutz Ag Vorrichtung und Verfahren zur naßmechanischen Aufbereitung von Feststoffen
DE19901655A1 (de) * 1999-01-18 2000-07-20 Baker Hughes De Gmbh Zentrifuge zur naßmechanischen Trennung von Feststoffgemischen
JP2002186878A (ja) * 2000-12-21 2002-07-02 Nkk Corp 湿式比重分離装置およびその運転方法
DE10212187A1 (de) * 2002-03-20 2003-10-02 Hiller Gmbh Schneckenzentrifuge
AT518275B1 (de) 2016-04-26 2017-09-15 Andritz Tech And Asset Man Gmbh Schneckenzentrifuge zur nassmechanischen trennung von feststoffen

Also Published As

Publication number Publication date
CA2963405A1 (en) 2017-10-26
EP3238828C0 (de) 2025-01-08
JP6840011B2 (ja) 2021-03-10
EP3238828A1 (de) 2017-11-01
AT518275B1 (de) 2017-09-15
US10213791B2 (en) 2019-02-26
US20170304846A1 (en) 2017-10-26
CA2963405C (en) 2022-04-26
AT518275A4 (de) 2017-09-15
JP2017196615A (ja) 2017-11-02

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