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WO1995004640A1 - Procede de recyclage de pneus - Google Patents

Procede de recyclage de pneus Download PDF

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Publication number
WO1995004640A1
WO1995004640A1 PCT/CA1994/000416 CA9400416W WO9504640A1 WO 1995004640 A1 WO1995004640 A1 WO 1995004640A1 CA 9400416 W CA9400416 W CA 9400416W WO 9504640 A1 WO9504640 A1 WO 9504640A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber
tires
pieces
tire
steel
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/CA1994/000416
Other languages
English (en)
Inventor
William Forlippa
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.)
MOVETECH Inc
Original Assignee
MOVETECH Inc
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 MOVETECH Inc filed Critical MOVETECH Inc
Priority to AU73793/94A priority Critical patent/AU7379394A/en
Publication of WO1995004640A1 publication Critical patent/WO1995004640A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
    • B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
    • 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
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/08—Transition metals
    • B29K2705/12—Iron
    • 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
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • 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 method and apparatus for recycling tires and, more particularly, to a method for removing steel wires from rubber material by compressing split tires to devulcanize them prior to removing the metal inclusion therein.
  • SUBSTITUTE SHEET U.S. Patent Number 3,384,309 to James E.F. Marshall relates to a process for the separation of metal from rubber or similar compositions and, more particularly, to the reclamation of rubber from scrap tires having wire plies.
  • Pieces of scrap tire are passed through a cracking plant and converted to crumbs.
  • the crumbs are separated by size by a shaker and crumbs that are contaminated by heavy pieces of wire are removed by a magnetic drum separator and discarded. No steel wire is removed from the rubber prior to crumb formation and the crumbs are exposed to only one magnetic separator.
  • Japanese Patent Number 5-4011 - 184 discloses a method for recovering rubber powder from scrap tires. The tires are crushed and then exposed to a primary magnetic separator. The remaining substances are exposed to a secondary magnetic separator and the iron-containing rubber particles are introduced to a cracking means
  • U.S. Patent Number 4,025,990 discloses a process wherein scrap tires, containing magnetic components and non-magnetic rubber and cord components, are cooled in a cryogenic freezer to the embrittlement temperature, comminuted in a comminution device and passed through a series of screening and density classification operations, followed by magnetic material separation and further cryogenic size reduction to produce a rubber crumb product having a particle size of about 1/20 inch or less.
  • U.S. Patent Number 4, 113, 186 discloses a system for treating rubber tires which reduces the tires to a particulate agglomeration wherein cord and rubber matter therein can be separated. A further treating of those rubber particles reduces them to screen size.
  • the system requires the steps of: (a) initially debeading the tire; (b) cutting the tire into chunks; (c) regulating the quantity of chunks as they pass through the system; (d) grinding the tire in a high intensity mixer; (e) passing the grind to a hammer mill to loosen the rubber and the cord from one another; and (f) separating the rubber particles to a size of about 30 to 100 mesh as a final product. Oversized pieces of rubber discharged from the separator near the end of the system would be returned to the high intensity mixer.
  • U.S. Patent Number 4,134,556 (Ehrlich et al.) describes a tire shredder in which multiple cutting discs are fixed in spaced-apart positions on each of two side- by-side counter-rotating shafts so that peripheral portions of the discs on each shaft extend into the spaces between discs on the opposite shaft.
  • Each disc has a smooth cylindrical peripheral surface which meets opposed sidewalls at sharp continuous cutting edges. Material shredded by the discs falls out onto a slowly rotating screening drum encircling the disc assembly. The smallest shredded pieces pass through the drum onto a discharge conveyor.
  • SUBSTITUTE SHEET U.S. Patent Number 4,405,090 to Wakeem describes an apparatus which includes a conveyor which carries the tires through a cutting mechanism in the form of a pair of transverse saw blades and a single longitudinal saw blade.
  • the saw blades cut each tire into four pieces which are fed down an inclined chute against the abrasive surface of a grinding wheel.
  • the tire pieces are ground by the wheel into small particles of rubber and steel which are separated from one another by a magnetic conveyor.
  • U.S. Patent Number 4,714,201 to Rouse et al. discloses an apparatus and method for use in reducing discarded pneumatic tires.
  • the apparatus includes a series of machines which successively shear and granulate the tires into smaller and smaller pieces.
  • two successive rotary shear machines are followed by a granulator.
  • the pieces are sorted before being sent to the granulator and oversize pieces are sent a second time through the two shears.
  • a single rotary shear apparatus is followed by a pair of granulators which successively reduce the size of pieces of material to progressively smaller sizes.
  • Materials are fed to the rotary shears and granulators by conveyors whose speeds are controlled by varying the frequency of alternating current electric power supplied to electric monitors driving the conveyors, with the frequency being controlled in responses to sensing the load on the shears and granulators, so that the shears and granulators are operated at or near their maximum capacity.
  • U.S. Patent Number 4,726,530 to Miller discloses a continuous process for reclaiming rubber, steel and fiber products from tires wherein the tires and tire material flow on conveyors throughout the various steps of the process, including steps of shredding a flow of whole tires into pieces in a shear-type shredder, and screening the flow of tire pieces by size into a first flow containing pieces of at least as large as a specific size, and a second flow containing pieces under a specified size. Reshredding and rescreening the pieces of the first flow is performed until they are smaller than the specified size. Granulating the pieces of the second flow occurs in a first granulator wherein the pieces remain in the granulator until they are reduced
  • Fiber materials are vacuumed from the flow of granulated material within an air separator after granulation and steel and steel- containing rubber pieces are removed from the flow of material via a magnetic separator after the fiber materials have been removed.
  • U.S. Patent Number 4,813,614 discloses a process wherein scrap tires are subjected to low temperatures that are approximately the temperature of crystallization of the components thereof. The product at this lowered temperature is then crushed sufficiently to cause the components thereof to release sufficiently to be subsequently separated according to material.
  • the separation steps can include subjecting the crushed material to magnetic or electrostatic fields, air flows caused by either pressurized air or vacuums, and mechanical separation with vibratory screens and rakes. The materials of the original product are sufficient separated to enable them to be recycled into a reusable product.
  • U.S. Patent Number 5,024,386 to Alvin L. Morris discloses a method and apparatus for shredding tires, comprising the steps of: debeading the tire; cutting it diametrically into segments; and then spreading the sidewalls apart while flattening each segment and feeding the segment into a shredding cutter causing the shredding of the tire while the segment is held in flattened condition. The resulting crumbs are then granulated and the granulated particles are passed over magnetic separator drums.
  • U.S. Patent Number 4,840,316 discloses an apparatus for removing the rubber from the crown portion of a tire having a rotatably driven rasp and a linearly displaceable capture roller.
  • the capture roller is moved from a load position distant the rasp to an engagement position closely adjacent the rasp.
  • First and second tensioning rollers are biased to pinch a tire between each of the tensioning rollers and the capture roller.
  • the capture roller presents to the rasp a work surface which is
  • the present invention relates to a novel process for recovering reusable material from steel-containing rubber articles, especially used tires. It has been discovered that by magnetically removing steel wires from heated, devulcanized tire scrap prior to granulation of the tire scrap, a rubber powder having a very low iron content can be recovered.
  • the use of the term "tire scrap" in the present invention relates to whole or ungranulated portions of used or defective tires as well as other rubber products having metal inclusion pieces in the rubber.
  • the rubber powder that is recovered by the process of the present invention has a lower steel content than processes which granulate steel-containing used tires, without first removing some of the steel reinforcing wires from the used tires.
  • Another aspect of the present invention is that steel, having relatively little rubber contamination, can be recovered from used tires. The objectives of the present invention are achieved without requiring the rubber articles to be cooled below their crystallization temperatures.
  • SUBSTITUTE SHEET One embodiment of the present invention for recycling components of tires comprises the following steps: cutting the tire into two pieces; pressing the pieces between rollers to devulcanize the rubber; subjecting the devulcanized rubber to a magnetic field while holding the devulcanized rubber stationary to draw the larger metal inclusion pieces from the rubber; and grinding the rubber into pieces to be recycled.
  • Another embodiment of the invention involves a process for the extraction of steel from vulcanized rubber.
  • the process comprises the step of heating an ungranulated, steel-containing rubber article and applying a magnetic field to the ungranulated, steel-containing rubber article, said magnetic field having sufficient strength to remove at least a portion of the steel contained in the rubber article.
  • a further embodiment of the invention involves a process for recovering rubber and metal content from tires by debeading the tires; devulcanizing the tires by compressing the tires between rollers; removing steel wire, with a magnetic separator, from the compressed material; grinding the material that results from the previous step into pieces; passing said pieces by a magnetic separator to remove additional steel wire; grinding the pieces that result from the previous step into particles having a mean size of at least about 50 mesh U.S. standard size; and separating flock cord from the rubber particles and recovering the rubber product.
  • An additional embodiment involves a process for the separation of components in tire scrap. This process comprises the step of heating the tire scrap while compressing the tire to devulcanize the tire prior to applying a magnetic field to the tire to remove metal content from the tire.
  • An apparatus for separating components present in tires is also embodied in the present invention.
  • This apparatus comprises a cracker mill and a magnetic separator positioned such that said magnetic separator is able to remove steel wires
  • SUBSTITUTE SHEET having a length of above 2 cm to about 40 cm from the tires which have been processed by said cracker mill.
  • a particularly preferred embodiment involves a rubber powder which is produced by the processes of the invention.
  • Figure 1 is a process flowsheet illustrating a preferred embodiment of the invention for reclaiming rubber, metal content and flock from whole tires.
  • the present invention involves a process for the extraction of steel from vulcanized rubber by devulcanizing the rubber by passing the rubber through a mill while heating and then applying a magnetic field to said ungranulated, steel-containing rubber article.
  • the magnetic field has sufficient strength to remove at least a portion of the steel wire contained in the rubber article.
  • the process entails the separation of components from tire scrap by heating the tires while compressing the tires to devulcanize them prior to applying a magnetic field to die tire to remove metal content from the tire.
  • components used herein refers to rubber, steel wire and tire cord that can be removed from the tire and either recycled or discarded as waste.
  • the steel wires that are removed will have varied lengths depending on the step in the process when they are removed.
  • Wire pieces removed during early processing will have lengths of about 2 cm to about 40 cm, whereas wire removed after the rubber has been ground into pieces will have pieces of at least about 50 mesh and sizes that coincide with the rubber pieces themselves.
  • a distinct advantage of the present invention is the removal of as much of the longer wire as possible before the rubber is ground into pieces. In this fashion, the amount of small pieces of wire embedded in the rubber is significantly reduced, thus aiding in increasing the amount of rubber that can be recycled.
  • SUBSTITUTE SHEET A particularly preferred process for recycling the components of tires involves cutting the tires into two pieces of approximately equal size; pressing the pieces between rollers to devulcanize the rubber; subjecting the devulcanized rubber to a magnetic field while holding the devulcanized rubber stationary to draw the larger metal inclusion pieces from the rubber; and grinding the rubber into pieces to be recycled.
  • the tires are cut into a pair of arcuate or vertical pieces of approximately equal size.
  • the tires are able to be readily debeaded to remove the inside rims and compressed within a roller mill, such as a cracker mill which employs smooth steel rollers to destroy the vulcanization/memory ofthe rubber tire. This process also creates heat while compressing the tire which also aids in the devulcanization process.
  • tires of different rubber consistency and color are blended together into a single solid mass which is then ground into smaller pieces. Grinding may be done by conventional means such as in a refiner mill which receives the rubber sheet which passes between corrugated rollers to produce the desired piece size. Sizes of at least about 50 mesh, U.S. standard size, have been found useable in the process of the invention. Once ground, the pieces are passed once more through a magnetic separator to further remove steel inclusion pieces from the rubber particles. This procedure may be repeated several times to ultimately prepare a metal-free rubber product that can be readily recycled.
  • the tires are preferably first debeaded and then further processed by devulcanizing the tires by compressing the tires between rollers; removing steel wire with a magnetic separator from the compressed material; grinding the material that results into pieces; passing said pieces through another magnetic separator; grinding the pieces that result into particles having a mean size of at least about 50 mesh U.S. standard size; and separating flock cord from the rubber particles by subjecting the mass to an air classifier and recovering the rubber product.
  • Conventional air classifiers are used for this purpose since they enable the removal of flock cord without contaminating the fine rubber pieces that are passed to a bagger device for storage or shipment for reuse. The flock can then also be conveniently bailed and reused.
  • the apparatus used in the present invention comprises a cracker mill and a magnetic separator positioned such that said magnetic separator is able to remove steel wires having a length of about 2 cm to about 40 cm from the tires which have been processed by the cracker mill.
  • the apparatus further comprises means for introducing debeaded tires into the cracker mill and means for continuously conveying the output from said cracker mill to a grinding means.
  • the apparatus further comprises a tire splitter which splits the tires which are then passed to the cracker mill; a primary refiner mill which receives the devulcanized rubber from the cracker mill; a second magnetic separator; a fine grinder to grind the milled rubber into small pieces; and an air classifier capable of removing cord from rubber particles and recovering the rubber pieces.
  • the rubber powder which is produced by the process of the invention can be recycled for use with natural rubber to produce shoe soles, new tires and other rubber products.
  • the amount of material that can be used in such products will depend on various factors, such as end product desired, structural integrity of the product and intended use. Amounts of about 2% to 25% have been found effective in a variety of applications, including fillers for asphalt and concrete.
  • the process begins by loading whole tires 2 and splitting them in half in tire splitter 4.
  • the whole tires are loaded in a vertical position onto a side and bottom moving conveyor.
  • This type of conveyor ensures that the tires are somewhat forced into the cutting blade.
  • the conveyor is operated by an electric motor (not shown). While the length of this conveyor can vary greatly, a preferred conveyor is about 15 feet long or long enough to hold at least five (5) tires on the conveying belt.
  • an upper and lower drive belt center the tire past the blade 6.
  • the drive belts ensure a straight center cut made vertically (i.e. , parallel) to the tread.
  • the drive belts are centered for a 14- inch tire.
  • the upper belt will run substantially higher than center on 13-inch tires and very close to center on 15-inch tires.
  • the distance between the top upper edge of the bottom belt and the lower edge of the top belt is approximately six inches, even though this is not a critical feature.
  • the bottom conveyor continues from the point of loading up to the point of the cutting blade.
  • the cutting blade may be any suitable cutting blade, such as a band saw type.
  • the blade may rotate constantly at a high speed or be activated when receiving each tire.
  • the teeth of the saw can be very fine and may create some residue during the cutting process.
  • the dust that is created by the blade is a mixture of steel shavings and tire tread rubber. This mixture may be conveniently collected below the cutting blade and disposed of in a routine manner. When a sufficient amount of this mixture is collected, it is passed through a magnetic separator where the steel is removed and the rubber sent on for further processing.
  • tire 2 falls onto conveyor 8 which leads to the debeading operation.
  • the tire splitter 4 has the capacity to handle 1,200 to 1,600 vehicle tires per hour, including automobile, truck and bus tires. Multiple tire splitters or larger capacity devices can be used if higher capacity is desirable.
  • Conveyor 8 such as an electric-powered conveyor, transfers the split tires from tire splitter 4 to debeader 10.
  • the size of conveyor 8 can vary but is about 3.5 feet wide and about 10 feet long.
  • the conveyor may be optionally equipped with steel rollers along the sides to ensure that no jam-ups occur.
  • the debeader 10 has the capacity to handle up to 15-inch passenger tires, but may be readily modified to handle more or less tires.
  • An attached sensor means (not shown) senses an awaiting tire and initiates the debeader' s roller conveyor to position the tire under tearing and holding rings.
  • Another sensor determines the diameter of the tire and sets the tearing ring to a preset diameter, depending on tire size, i.e. , 13- , 14- or 15-inch tire.
  • the holding ring ensures that the tire does not move while the tearing ring is extracting the bead from the tire.
  • the debeader 10 is optionally hydraulically operated and controlled movements are determined by sensors or other conventional means.
  • the purpose of the holding ring is to secure the tire while the tire is being debeaded.
  • a hydraulically powered tearing ring (not shown) then typically tears the bead away from the tire.
  • the tearing ring may be a conventional device such as one comprising five piercing 2" ends which are followed by push-bars. As the piercing ends are pushed through the tires at the outer bead area, the bead is torn away from the carcass of the tire. The removed bead, which has only minimal rubber attached, is then put aside for further disposal. The debeader then resets for the next tire.
  • Conventional debeaders typically have capacity to handle 2,600 tires per hour, which can be used herein.
  • a second conveyor 12 then transfers the debeaded tire to primary cracker mill 14.
  • the cracker mill 14 may have a variable length (typically about 90" long) and powered by electric motors.
  • the rubber is meshed together as it passes through the rolls of the mill, which are preferably smooth steel rollers.
  • the rubber in tires is generally referred to as vulcanized rubber. Basically, this means that the tire rubber is in a memorized state. Vulcanization of rubber decreases its solubility in solvents and this property frequently is used as a qualitative measure of cure. Vulcanization by sulfur accounts for practically all the commercial products; however, peroxide types of curing systems may be used, especially for some of the synthetic rubber.
  • the treads of most passenger cars consist mainly of styrene-butadiene synthetic rubber.
  • the primary cracker mill 14 removes the memory from the tire or devulcanizes the rubber by masticating and heating the rubber.
  • the rubber from separate tires is only partially mixed and is conveyed by conveyor 16 to an optional secondary cracker mill 18.
  • the -conveyor 16 that transfers the stock material from the primary cracker 14 to the secondary cracker 18 may be about 12" wide to several feet wide and is powered by an electric motor (not shown). Knives affixed to the primary cracker mill 14 ensure that the width of the stock remains consistent, preferably about 10" wide. The stock from the conveyor 16 is fed directly into the secondary mill 18.
  • the secondary mill 18 can be identical to the primary mill 14, both being conventional pieces of equipment.
  • the mills' function is to further mix the rubber in order to make the blend of rubber from different tires more consistent.
  • the smooth steel rollers on this mill are placed closer together than the rolls on the primary mill in order to ensure a proper blend.
  • the rubber is heated by the physical action of the rollers on the rubber in the primary and secondary crackers. Additional, i. e. , non-frictional, heat may be utilized in the process of the present invention to further devulcanize the rubber.
  • the rubber exiting from the cracker mill is in the form of a devulcanized sheet of rubber and is then treated to remove metal tread or wire inclusive pieces in the rubber.
  • the steel from the bead was removed at an earlier stage in the process and, therefore, the only steel that remains in the rubber is the steel that was in the tread.
  • the steel length in the tread is directly proportional to the width of the tire and steel wire in the tread typically varies from about 2 cm to about 40 cm.
  • a magnetic separator 21 which is located directly above the blending stock, draws out steel wire which is located near the outer surface of the stock.
  • the steel that is collected by magnetic separator 21 is put aside to a separate bin to be recycled.
  • the magnetic separator has an electromagnetic roller which may have a low intensity magnetic field or high intensity magnetic field depending on the thickness of the rubber exiting the cracker mill.
  • the rubber stock is then conveyed by conveyor 20, which may be the same type of conveyor as that which is used between the primary and secondary cracker mills and is preferably 30" wide.
  • the rubber stock is preferably fed directly into the top of the refiner mill 22, which breaks the rubber up into pieces.
  • SUBSTITUTE SHEET Refiner mill 22 is very similar to cracker mills 14 and 18; the major difference being that instead of having smooth steel rollers, the refiner mill has corrugated rollers 24.
  • the refiner mill 22 may be quite long, e.g. , 42" long, and powered by an electric motor (not shown).
  • the incoming stock will be ground by offset corrugated rollers 24 and, unlike the cracker mills, instead of stock coming back up over the top of the roller, the stock will fall to conveyor 26 below.
  • the pieces •f rubber that fall to conveyor 26 will be about eight mesh in size (U.S. standard size).
  • the particles, having sizes of about eight mesh, are then passed through another optional magnetic separator 28.
  • the magnetic separator 28 is similar to magnetic separator 21 previously described and extracts additional metal inclusion pieces within the rubber particles.
  • Conveyor 26 is preferably situated under the primary refiner mill 22 and is about 60" wide, with rungs running across the width every 12 inches. The purpose of the rungs is to ensure that the stock material is transferred to the secondary refiner mill 30. This conveyer will be between 12 to 15 feet in length.
  • the particles of stock material are then loaded from conveyor 26 into the top of an optional secondary refiner mill 30.
  • the rollers and the corrugation of the rolls in secondary refiner mill 30 are closer than that of the primary refiner mill in order to produce finer particle size material.
  • the finer particles which fall from the secondary refiner mill 30 pass by magnetic separator 32, similar in construction to those described previously, which continues the process of removing metal fine inclusions from the particles.
  • the rubber particles are then passed into a fine grinder using a vibrating conveyor 34 which may be 24" wide and powered by an electric motor (not shown).
  • the conveyor vibrates in order to level the load of rubber particles so that they may drop consistently into fine grinder 36.
  • the particles on the vibrator conveyor are
  • SUBSTITUTE SHEET generally about 10 to 20 mesh in size and are transferred through a funnel (not shown) at the end of the vibrating conveyor 34 into the top of a circular grinder.
  • the fine grinder 36 which is a conventional piece of equipment, is totally enclosed and designed for grinding the rubber.
  • the unit is equipped with a size classifier and is designed not to allow anything larger than about 50 mesh to exit.
  • the greater than 50 mesh rubber then falls from the bottom of the fine grinder 26 and passes over another magnetic separator 38 of the same or different type as previously described. At this point, very little metal is left in the rubber and the rubber can be recycled and used for its intrinsic purposes without fear of metal contamination of products produced therefrom.
  • the fine mesh rubber is optionally stored or passed to air classifier 40 to separate heavy objects from light objects. Fifty mesh rubber particles fall from the fine grinder 36 into the top of air classifier 40. The air classifier 40 separates cord
  • the rubber product then drops directly from air classifier 40 into the opening of pneumatic conveyor 44 which then transfers the rubber to storage tank 46 directly above the weight bagger 48.
  • One thousand pound sacks, or sacks of other convenient size, are then placed in position on the weight scale.
  • a sliding door on the storage tank is opened to release the exact amount of rubber, such as 1,000 pounds, into the sack and then the door shuts.
  • the full sack is removed and another sack is positioned to receive more rubber particles.
  • the metal and steel products removed during the process are eventually collected in collectors 50 and used as metal scrap.
  • the small particles of rubber can be used as fill-in asphalt and rubber products without being melted down or naturally separated from new rubber. Levels of about 1% to about 10%, and preferably about

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

Procédé de séparation du métal d'un pneu en caoutchouc, selon lequel: a) on coupe le pneu en deux parties; b) on comprime les parties de pneu entre des cylindres pour dévulcaniser le caoutchouc; c) on soumet le caoutchouc dévulcanisé à un champ magnétique en maintenant le caoutchouc dévulcanisé immobile pour extraire du pneu les plus gros morceaux d'inclusion métalliques; et d) on broye le caoutchouc en petits morceaux pour le recycler. Cette invention concerne également un appareil de traitement du caoutchouc vulcanisé.
PCT/CA1994/000416 1993-08-05 1994-08-04 Procede de recyclage de pneus Ceased WO1995004640A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU73793/94A AU7379394A (en) 1993-08-05 1994-08-04 Method for recycling tires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13159093A 1993-08-05 1993-08-05

Publications (1)

Publication Number Publication Date
WO1995004640A1 true WO1995004640A1 (fr) 1995-02-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1994/000416 Ceased WO1995004640A1 (fr) 1993-08-05 1994-08-04 Procede de recyclage de pneus

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AU (1) AU7379394A (fr)
WO (1) WO1995004640A1 (fr)

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ES2156501A1 (es) * 1998-09-22 2001-06-16 Marin Rafael Garcia Procedimiento para la recuperacion y transformacion de caucho de neumaticos usados y similares.
WO2003014206A1 (fr) * 2001-08-03 2003-02-20 Watson Brown Hsm Ltd. Traitement d'elastomeres reticules
DE102005013693A1 (de) * 2005-03-21 2006-09-28 Cvp Clean Value Plastics Gmbh Verfahren und Anlage zur Herstellung eines Faserstoffes aus agglomeriertem Mischkunststoff
ITVR20090076A1 (it) * 2009-05-28 2010-11-29 M C S P A Impianto di smaltimento dei pneumatici esausti
WO2015094832A1 (fr) * 2013-12-19 2015-06-25 Bridgestone Americas Tire Operations, Llc Système et procédé de recyclage de pneus comprenant la pyrolyse des pneus
CN110337350A (zh) * 2017-03-31 2019-10-15 尤妮佳股份有限公司 制造再生产品的方法、再生树脂粒料、以及再生薄膜
WO2024036248A1 (fr) * 2022-08-11 2024-02-15 Avient Corporation Articles thermoplastiques surmoulés et procédés de récupération de matériau thermoplastique de haute pureté à partir de ceux-ci

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CN114368083B (zh) * 2021-07-04 2023-07-14 宁波永基精密科技有限公司 一种废旧橡胶产品混炼工艺

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2156501A1 (es) * 1998-09-22 2001-06-16 Marin Rafael Garcia Procedimiento para la recuperacion y transformacion de caucho de neumaticos usados y similares.
WO2003014206A1 (fr) * 2001-08-03 2003-02-20 Watson Brown Hsm Ltd. Traitement d'elastomeres reticules
DE102005013693A1 (de) * 2005-03-21 2006-09-28 Cvp Clean Value Plastics Gmbh Verfahren und Anlage zur Herstellung eines Faserstoffes aus agglomeriertem Mischkunststoff
US7757974B2 (en) 2005-03-21 2010-07-20 Cvp Clean Value Plastics Gmbh Method and apparatus for comminuting and cleaning of waste plastic
ITVR20090076A1 (it) * 2009-05-28 2010-11-29 M C S P A Impianto di smaltimento dei pneumatici esausti
WO2015094832A1 (fr) * 2013-12-19 2015-06-25 Bridgestone Americas Tire Operations, Llc Système et procédé de recyclage de pneus comprenant la pyrolyse des pneus
CN110337350A (zh) * 2017-03-31 2019-10-15 尤妮佳股份有限公司 制造再生产品的方法、再生树脂粒料、以及再生薄膜
CN110337350B (zh) * 2017-03-31 2021-08-10 尤妮佳股份有限公司 制造再生产品的方法、再生树脂粒料、以及再生薄膜
WO2024036248A1 (fr) * 2022-08-11 2024-02-15 Avient Corporation Articles thermoplastiques surmoulés et procédés de récupération de matériau thermoplastique de haute pureté à partir de ceux-ci

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