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WO1993019850A1 - Plant for the separation of various kinds of small sized materials - Google Patents

Plant for the separation of various kinds of small sized materials Download PDF

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Publication number
WO1993019850A1
WO1993019850A1 PCT/EP1993/000714 EP9300714W WO9319850A1 WO 1993019850 A1 WO1993019850 A1 WO 1993019850A1 EP 9300714 W EP9300714 W EP 9300714W WO 9319850 A1 WO9319850 A1 WO 9319850A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
liquid
separation
specific weight
plant
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/EP1993/000714
Other languages
French (fr)
Inventor
Flavio Previero
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.)
Sorema Srl
Original Assignee
Sorema Srl
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 Sorema Srl filed Critical Sorema Srl
Publication of WO1993019850A1 publication Critical patent/WO1993019850A1/en
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
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B11/00—Feed or discharge devices integral with washing or wet-separating equipment
    • 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
    • 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
    • B03B5/36—Devices therefor, other than using centrifugal force
    • B03B5/38—Devices therefor, other than using centrifugal force of conical receptacle 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
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0231—Centrifugating, cyclones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0237—Mechanical separating techniques; devices therefor using density difference
    • B29B2017/0244—Mechanical separating techniques; devices therefor using density difference in liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/065—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts containing impurities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/008—Wide strips, e.g. films, webs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention relates to a plant for the separation of material of various kinds in small pieces or Leaves, treated in a plant using water or another appropriate liquid as conveying fluid. This is the case which occurs, for example, in plants for the recycling of plastic material.
  • Equipment for the separation of material in small pieces of various kinds is already known, such as for example that described in the U.S. patent no. 4,483,768.
  • This patent relates to a plant consisting of a separation tank filled up to a predetermined level with a certain liquid, and of extremely simple devices for feeding into the tank material to be separated with a horizontal jet of material and conveying Liquid at a pressure higher than that existing in the inlet area due to the weight of the mass of Liquid contained in the tank.
  • the jet having these features divides almost immediately into two vertical flows: an ascending flow for the material whose specific weight is lower than that of the mass of Liquid contained in the tank and a descending flow for the material whose specific weight is higher respectively.
  • the position of the feed device varies according to the different possible specific weights of the components of the material.
  • the plant comprises finally a first and second means for removing the separated material from the mass of liquid contained in the tank.
  • the two means are placed at said predetermined Level and at the bottom of the tank respectively for the ejection of the components of the material having lower and higher specific weight respectively than that of the mass of Liquid contained in the tank itself.
  • the object of the following invention is therefore the improvement to the plant described above in respect of efficiency of separation of the components of the materiaL with different specific weight.
  • this object is accomplished by means of a plant comprising a tank containing a certain liquid up to a predetermined level, a device for feeding material to be separated together with a conveying liquid of the same kind as that contained in the tank with a horizontal jet at a pressure higher than that of the liquid contained in the tank in the inlet area and due to the weight of the mass of the Liquid itself and means placed at the top and at the bottom of the tank for removing the components of the materiaL having Lower and higher specific weight respectively from the mass of Liquid, characte is-d i- th ⁇ t s id * ea s f * ⁇ removing the component with higher specific weight and the conveying Liquid from the separation tank are accomplished in such a way as to produce in output a flow rate of the component with higher specific weight and of said liquid greater than the flow rate of the material to be separated and of the conveying liquid in input at the separation tank.
  • the difference between the said two flow rates is such as to determine a descending flow, in the mass of liquid contained in the separation tank, of such high intensity that it prevents any possible ascending flow of the components of the materiaL with the sole exclusion of the components having an extremely Low specific weight; only these components can in this way reach the clear surface of the mass of Liquid contained in the tank and be removed therefrom to the outside.
  • an external circuit is necessary for recycling the Liquid removed from the separation tank, which is provided with means for filtering and separating liquid from the components of the material transported by the liquid itself outside of the tank. A part of the recycled liquid is returned directly to the separation tank by pumping means, whiLe another part of said Liquid is conveyed towards a device for mixing materiaL and Liquid upstream of the separation tank.
  • the separation plant iLLustrated in the drawing 1 comprises * a generical mixing mechanism 25 in which the material which has to be separated (A) is mixed with a conveying liquid (B) by a pump 26 actuated by a motor 27, a washing device 28, which comprises a plurality of blades 29 arranged radially on a rotating shaft 30 moved by a motor 31 and which is positioned between the pump 26, actuated by the motor 27, and the separation tank 1 designed to be filled with a Liquid 2, of the same kind as the conveying Liquid, up to a predetermined Level L.
  • the tank 1 is related to a device 3 for feeding the materiaL to be separated and the conveying Liquid CC), which consists of a hydrauLic cyclone 4 with vertical axis and formed by a Lateral external wall 5, whose upper part 6 is cylindrical and whose Lower part 7 is a truncated cone.
  • the hydrauLic cyclone 4 internally, has a cylindrical sleeve 8 with vertical axis; said cylindrical sleeve 8 is open at the two bases, apertures 9 and 10, and is connected above to the lateral wall 5 of the cyclone 4 by means of an annular plate 11.
  • the hydrauLic cycLone 4 is connected in its inner part to the internaL space 39 of the tank 1.
  • a conduit 13 for feeding material and conveying Liquid flows in the lateral wall of the upper cylindrical part 6 of the external part 5, in this case also having the function of supporting the cyclone 4; said conduit 13 is inserted tangentiaLly in an annular space 14 defined by the upper part 6 of the lateral wall 5 of the cyclone 4 and by said cylindrical sleeve 8.
  • a system 15 for removing material of Lower specific weight, which comprises rollers 16 provided with blades 17, rotatably supported by the external walls of the tank 2.
  • the rollers 16 are made to rotate by an eLectric motor 18.
  • the roLLers 16 are bladed in such a way that their blades 17 dip into the Liquid 2 to a Limited extent.
  • the lower edge 19 of a discharge aperture 20 is provided: this aperture is in turn connected to a discharge conduit 21 for the material and through a grating 22 with a discharge conduit 23 for any Liquid remaining together with the materiaL of Lower specific weight.
  • the system for ejecting heavy materiaL consists of a variable flow rate pump 24 pLaced below the bottom of the tank 1 and with features such that it determines a rate of flow of discharge liquid and materiaL greater than that in input to the cyclone 4.
  • the discharge conduit 23 and the variable flow rate pump 24 are connected by means of respective pipes 32 and 33 to a tank 34, provided internally with means for separating materiaL of higher specific weight from the conveying Liquid.
  • Said tank 34 is connected to a pump 35, actuated by a motor 43, which in turn supplies the mixing device 25, and to a side chamber 38 of the tank 1 by means of pipes 36 and 37 respectively.
  • the chamber 38 is connected to the internal space 39 of the tank 1 by means of an aperture 40 provided with filtering means 41.
  • the assembly composed of the pipes 32, 33, 36 and 37, the tank 34 and the pump 35 form an external circuit 42 for recycling the conveying Liquid.
  • the material to be separated (A) is combined with the conveying liquid CB) in the mixing device C25) and pumped therefrom, by the pump 26, to the separation device 28 where a possible separation of small pieces of material which have remained attached to each other takes pLace.
  • the material and the conveying Liquid (C) are fed into the separation tank 1 at a selected pressure higher than that of the mass of Liquid 2 by means of the feed device 3 composed of the hydraulic cyclone and of the tangential conduit 13.
  • the materiaL and the conveying Liquid, forced into the upper part of the hydraulic cyclone 4 are imparted, on account of the structure of the upper part of the cyclone itself Cupper part 6 of the Lateral wall 5 and cylindrical sleeve 8), with rotary motion for the purposes of separating the material.
  • CA is very intense and entrains all the remaining components of the materiaL and the conveying Liquid; said flow, poured into the mass of liquid 2, moves down towards the materiaL removing devices, the pump 24, positioned at the bottom of the tank 1.
  • the blades 17 of the rollers 16 of the system for removing the Lighter material 15 push the material CA'-B 1 ) out of the tank 1 towards the discharge conduit 21 together with a small quantity of Liquid CB') which is in turn discharged by means of the conduit 23 after having passed through the small apertures of the grating 22.
  • a part of the filtered Liquid CB) is then immediately transported by the pump 35 and the pipes 37 into the chamber 38 of the tank 1 and from there, through the aperture 40, into the internal space of the tank 1; another part of the fiLtered Liquid CB) however, may be pumped, through the pipes 36, towards the mixing device 24 in this way completing the cycle which began with the feeding of the materiaL to be separated CA) into said device 25.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Cyclones (AREA)

Abstract

A plant for the separation of small-sized material comprises a separation tank (1) which can be filled with liquid up to a predetermined level (L), a device (3) for feeding the material to be separated and conveying liquid into the tank (1) below said predetermined level at a pressure greater than that existing in the inlet area due to the weight of the mass of liquid contained in the tank itself and a first and second means for ejecting (23, 24) material from the tank (21, 24) positioned at said predetermined level and on the bottom of the tank (1) respectively for removing material having lower and higher specific weight respectively than that of the liquid contained in the tank. The means (24) for removing components of higher specific weight has features such that it provides in output a greater flow rate than that in input to the tank. An external circuit (34, 35, 37) is moreover provided for the partial recycling of the liquid discharged in the tank (1).

Description

PLANT FOR THE SEPARATION OF VARIOUS KINDS OF SMALL SIZED MATERIALS.
* * * * *
D E S C R I P T I O N The present invention relates to a plant for the separation of material of various kinds in small pieces or Leaves, treated in a plant using water or another appropriate liquid as conveying fluid. This is the case which occurs, for example, in plants for the recycling of plastic material. Equipment for the separation of material in small pieces of various kinds is already known, such as for example that described in the U.S. patent no. 4,483,768. This patent relates to a plant consisting of a separation tank filled up to a predetermined level with a certain liquid, and of extremely simple devices for feeding into the tank material to be separated with a horizontal jet of material and conveying Liquid at a pressure higher than that existing in the inlet area due to the weight of the mass of Liquid contained in the tank. The jet having these features divides almost immediately into two vertical flows: an ascending flow for the material whose specific weight is lower than that of the mass of Liquid contained in the tank and a descending flow for the material whose specific weight is higher respectively. In a similar plant the position of the feed device varies according to the different possible specific weights of the components of the material.
The plant comprises finally a first and second means for removing the separated material from the mass of liquid contained in the tank. The two means are placed at said predetermined Level and at the bottom of the tank respectively for the ejection of the components of the material having lower and higher specific weight respectively than that of the mass of Liquid contained in the tank itself.
It may occur in some cases that the separation of the various components of the material inside the mass of liquid contained in the tank is not complete and that the ascending flow entrains net only the conveying Liquid and the material with lower specific weight, for example plastic materiaL in small Leaves, but also part of the material having higher specific weight, for example pollutants, especially in the case wherein the materiaL with Lower specific weight is very light.
The object of the following invention is therefore the improvement to the plant described above in respect of efficiency of separation of the components of the materiaL with different specific weight.
In accordance with the invention this object is accomplished by means of a plant comprising a tank containing a certain liquid up to a predetermined level, a device for feeding material to be separated together with a conveying liquid of the same kind as that contained in the tank with a horizontal jet at a pressure higher than that of the liquid contained in the tank in the inlet area and due to the weight of the mass of the Liquid itself and means placed at the top and at the bottom of the tank for removing the components of the materiaL having Lower and higher specific weight respectively from the mass of Liquid, characte is-d i- th~t s id *ea s f*τ removing the component with higher specific weight and the conveying Liquid from the separation tank are accomplished in such a way as to produce in output a flow rate of the component with higher specific weight and of said liquid greater than the flow rate of the material to be separated and of the conveying liquid in input at the separation tank.
The difference between the said two flow rates is such as to determine a descending flow, in the mass of liquid contained in the separation tank, of such high intensity that it prevents any possible ascending flow of the components of the materiaL with the sole exclusion of the components having an extremely Low specific weight; only these components can in this way reach the clear surface of the mass of Liquid contained in the tank and be removed therefrom to the outside.
In order to compensate the difference between the input flow rate and the output flow rate, an external circuit is necessary for recycling the Liquid removed from the separation tank, which is provided with means for filtering and separating liquid from the components of the material transported by the liquid itself outside of the tank. A part of the recycled liquid is returned directly to the separation tank by pumping means, whiLe another part of said Liquid is conveyed towards a device for mixing materiaL and Liquid upstream of the separation tank.
The features of the present invention wiLL be made clearer by the following detailed description of its possible embodiment, shown by way of a non-lim tative example in the accompanying drawing in which the only figure shows the assembly of a plant according to the invention.
The separation plant iLLustrated in the drawing 1 comprises* a generical mixing mechanism 25 in which the material which has to be separated (A) is mixed with a conveying liquid (B) by a pump 26 actuated by a motor 27, a washing device 28, which comprises a plurality of blades 29 arranged radially on a rotating shaft 30 moved by a motor 31 and which is positioned between the pump 26, actuated by the motor 27, and the separation tank 1 designed to be filled with a Liquid 2, of the same kind as the conveying Liquid, up to a predetermined Level L.
The tank 1 is related to a device 3 for feeding the materiaL to be separated and the conveying Liquid CC), which consists of a hydrauLic cyclone 4 with vertical axis and formed by a Lateral external wall 5, whose upper part 6 is cylindrical and whose Lower part 7 is a truncated cone. The hydrauLic cyclone 4, internally, has a cylindrical sleeve 8 with vertical axis; said cylindrical sleeve 8 is open at the two bases, apertures 9 and 10, and is connected above to the lateral wall 5 of the cyclone 4 by means of an annular plate 11. The hydrauLic cycLone 4 is connected in its inner part to the internaL space 39 of the tank 1.
A conduit 13 for feeding material and conveying Liquid flows in the lateral wall of the upper cylindrical part 6 of the external part 5, in this case also having the function of supporting the cyclone 4; said conduit 13 is inserted tangentiaLly in an annular space 14 defined by the upper part 6 of the lateral wall 5 of the cyclone 4 and by said cylindrical sleeve 8.
At the clear surface of the mass of liquid 2, Level L, a system 15 is provided for removing material of Lower specific weight, which comprises rollers 16 provided with blades 17, rotatably supported by the external walls of the tank 2. The rollers 16 are made to rotate by an eLectric motor 18. As shown in Fig. 1, the roLLers 16 are bladed in such a way that their blades 17 dip into the Liquid 2 to a Limited extent. Again at the LeveL L, the lower edge 19 of a discharge aperture 20 is provided: this aperture is in turn connected to a discharge conduit 21 for the material and through a grating 22 with a discharge conduit 23 for any Liquid remaining together with the materiaL of Lower specific weight.
The system for ejecting heavy materiaL consists of a variable flow rate pump 24 pLaced below the bottom of the tank 1 and with features such that it determines a rate of flow of discharge liquid and materiaL greater than that in input to the cyclone 4.
The discharge conduit 23 and the variable flow rate pump 24 are connected by means of respective pipes 32 and 33 to a tank 34, provided internally with means for separating materiaL of higher specific weight from the conveying Liquid. Said tank 34 is connected to a pump 35, actuated by a motor 43, which in turn supplies the mixing device 25, and to a side chamber 38 of the tank 1 by means of pipes 36 and 37 respectively. The chamber 38 is connected to the internal space 39 of the tank 1 by means of an aperture 40 provided with filtering means 41. The assembly composed of the pipes 32, 33, 36 and 37, the tank 34 and the pump 35 form an external circuit 42 for recycling the conveying Liquid.
The material to be separated (A) is combined with the conveying liquid CB) in the mixing device C25) and pumped therefrom, by the pump 26, to the separation device 28 where a possible separation of small pieces of material which have remained attached to each other takes pLace.
The material and the conveying Liquid (C) are fed into the separation tank 1 at a selected pressure higher than that of the mass of Liquid 2 by means of the feed device 3 composed of the hydraulic cyclone and of the tangential conduit 13. The materiaL and the conveying Liquid, forced into the upper part of the hydraulic cyclone 4, are imparted, on account of the structure of the upper part of the cyclone itself Cupper part 6 of the Lateral wall 5 and cylindrical sleeve 8), with rotary motion for the purposes of separating the material. At the end part of the cylindrical wall 6 and of the lower aperture 10 of
- the sleeve 8, two different flows of material CA1) and CA") are formed: this corresponds to the separation of the material according to the different specific weights of its components. On the other hand the presence of the pump 24, with features such that it determines an output flow rate of the components with higher specific weight and conveying Liquid CA") greater than that CC) introduced by means of the feed device 3, contributes to determining an ascending flow composed of only the components of the materiaL having an extremely Low specific weight together with the conveying Liquid CA'). Said flow CA'), through the upper aperture 9 of the sleeve, passes into the mass of liquid 2 in the tank 1 and moves towards the clear surface of the mass of Liquid, LeveL L. The descending flow
CA") is very intense and entrains all the remaining components of the materiaL and the conveying Liquid; said flow, poured into the mass of liquid 2, moves down towards the materiaL removing devices, the pump 24, positioned at the bottom of the tank 1.
The blades 17 of the rollers 16 of the system for removing the Lighter material 15 push the material CA'-B1) out of the tank 1 towards the discharge conduit 21 together with a small quantity of Liquid CB') which is in turn discharged by means of the conduit 23 after having passed through the small apertures of the grating 22.
From the conduit 23 and the pump 24 the liquid and the components of higher specific weight Cflows B' and A") flow through the conduits 32 and 33 into the tank 34 provided with filtering means.
A part of the filtered Liquid CB) is then immediately transported by the pump 35 and the pipes 37 into the chamber 38 of the tank 1 and from there, through the aperture 40, into the internal space of the tank 1; another part of the fiLtered Liquid CB) however, may be pumped, through the pipes 36, towards the mixing device 24 in this way completing the cycle which began with the feeding of the materiaL to be separated CA) into said device 25.

Claims

C L A I M S
1. Plant for the separation of material of various kinds in small pieces or in leaves, comprising a tank CD containing a certain Liquid up to a predetermined level Cl_) , a device C3) for feeding material to be separated together with a conveying liquid of the same kind as that contained in the tank CD with a horizontal jet at a pressure higher than that of the Liquid contained in the tank in the inlet area and due to the weight of the mass of the same liquid, and means C2D and C24) positioned at the top and at the bottom of the tank CD to remove from the mass of liquid the components of material with Lower and higher specific weight respectively, characterised in that said means for removing the component of higher specific weight and the conveying Liquid C24) from the separation tank CD are accomplished so as to produce in output a flow rate of said component with higher specific weight and said Liquid greater than the flow rate of the material to be separated and of the conveying liquid in input at the separation tank.
2. Plant according to claim 1, characterised in that it has an external circuit C42) provided with filtering means C34) and pumping means C35) for the partial recycling of the conveying liquid removed from the separation tank.
3. PLant according to claim 1, characterised in that the device for feeding material and conveying liquid into the separation tank is a hydrauLic cyclone C4) provided with a tangential inlet conduit C13).
PCT/EP1993/000714 1992-04-01 1993-03-24 Plant for the separation of various kinds of small sized materials Ceased WO1993019850A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT92MI783 IT1255074B (en) 1992-04-01 1992-04-01 PLANT FOR THE SEPARATION OF VARIOUS NATURE OF SMALL PIECE OR IN LEAVES
ITMI92A000783 1992-04-01

Publications (1)

Publication Number Publication Date
WO1993019850A1 true WO1993019850A1 (en) 1993-10-14

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AU (1) AU3751893A (en)
IT (1) IT1255074B (en)
WO (1) WO1993019850A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000051741A1 (en) * 1999-03-04 2000-09-08 Behnsen, Silke Installation and method for separating substance mixtures having different densities
WO2004000464A1 (en) * 2002-06-19 2003-12-31 Outokumpu Oyj Pre-separation of feed material for hindered-bed separator
IT202300016638A1 (en) * 2023-08-03 2025-02-03 Lucio Sighinolfi MACHINE AND METHOD FOR RECYCLING A PLASTIC CONTAINER

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB962386A (en) * 1963-04-08 1964-07-01 Insinooritoimisto Engineeringb An improved hydraulic classifier
GB2050201A (en) * 1979-05-21 1981-01-07 English Clays Lovering Pochin Process for concentrating mica
US4483768A (en) * 1979-10-11 1984-11-20 Sorema S.R.L. Apparatus for separating materials of small size
DE3529760A1 (en) * 1985-08-20 1987-02-26 Strate Maschf Sand trap for separating off sinking materials from waste water
DE4030256A1 (en) * 1990-09-25 1992-03-26 Refakt Anlagenbau Gmbh Disintegrated polyvinyl chloride plastics scrap sepn. - by sepg. polystyrene foam and polyethylene@ particles in tower with downward water current to move up=and=down

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB962386A (en) * 1963-04-08 1964-07-01 Insinooritoimisto Engineeringb An improved hydraulic classifier
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DE4030256A1 (en) * 1990-09-25 1992-03-26 Refakt Anlagenbau Gmbh Disintegrated polyvinyl chloride plastics scrap sepn. - by sepg. polystyrene foam and polyethylene@ particles in tower with downward water current to move up=and=down

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WO2000051741A1 (en) * 1999-03-04 2000-09-08 Behnsen, Silke Installation and method for separating substance mixtures having different densities
WO2004000464A1 (en) * 2002-06-19 2003-12-31 Outokumpu Oyj Pre-separation of feed material for hindered-bed separator
GB2404884A (en) * 2002-06-19 2005-02-16 Oyj Outokumpu Pre-separation of feed material for hindered-bed separator
GB2404884B (en) * 2002-06-19 2005-11-16 Oyj Outokumpu Pre-separation of feed material for hindered-bed separator
AU2003232263B2 (en) * 2002-06-19 2008-11-13 Metso Outotec Finland Oy Pre-separation of feed material for hindered-bed separator
IT202300016638A1 (en) * 2023-08-03 2025-02-03 Lucio Sighinolfi MACHINE AND METHOD FOR RECYCLING A PLASTIC CONTAINER

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IT1255074B (en) 1995-10-18
ITMI920783A0 (en) 1992-04-01
ITMI920783A1 (en) 1993-10-01
AU3751893A (en) 1993-11-08

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