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WO1995018870A1 - Method of recovering platinum metals and an apparatus therefor - Google Patents

Method of recovering platinum metals and an apparatus therefor Download PDF

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Publication number
WO1995018870A1
WO1995018870A1 PCT/FI1995/000008 FI9500008W WO9518870A1 WO 1995018870 A1 WO1995018870 A1 WO 1995018870A1 FI 9500008 W FI9500008 W FI 9500008W WO 9518870 A1 WO9518870 A1 WO 9518870A1
Authority
WO
WIPO (PCT)
Prior art keywords
medium
band
roller
cylinders
stabilizing
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/FI1995/000008
Other languages
French (fr)
Inventor
Petri Korhonen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1995018870A1 publication Critical patent/WO1995018870A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
    • B09B3/35—Shredding, crushing or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
    • B01J37/0027—Powdering
    • B01J37/0036—Grinding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general
    • B01J38/72—Regeneration or reactivation of catalysts, in general including segregation of diverse particles
    • 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
    • B03B5/48—Washing granular, powdered or lumpy materials; Wet separating by mechanical classifiers
    • B03B5/56—Drum classifiers
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C22B11/04—Obtaining noble metals by wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/009—General processes for recovering metals or metallic compounds from spent catalysts
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a method of recovering platinum metals and an apparatus therefor.
  • the emission of car exhaust gases has today to be restrict ⁇ ed, and catalysts are being used for this purpose.
  • the objective of the catalyst is to bind hydrocarbons, nitric oxides and carbon monoxide.
  • the basic structure of the catalyst comprises a carrier, a stabilizing medium and the catalyst metals. Precious metal particles Pt, Pd, Rh are attached to the carrier to provide the catalytic oxidation and reduction. The oxidation of the incombustible hydrocar- bons and the carbon monoxide and the reduction of the nitric oxides take place in the metal particles on the stabilizing medium surface.
  • the carrier medium of the catalyst is a ceramic or metallic monolith.
  • the ceramic carriers are impact sensitive having an equally sized reactive substance area than the metallic ones, wherefore more and more metal ⁇ lic carriers are today being used.
  • the metallic monoliths are produced of high-temperature resistant ferritic chromic aluminum steel.
  • the metal carrier is made of steel foil with a thickness of approx. 0,05 mm, which is corrugated and rolled.
  • the stabilizing medium is spread on the surface of the battery. The precious metals are absorbed into the stabilizing medium as aqueous solution and reduced by hydro ⁇ gen. The battery is thereafter placed into a metal case.
  • the size, amount and dimensions of the catalysts are chosen to suit the respective car and motor.
  • the recovery catalysts can therefore have the same differences.
  • the catalyst (catalyzer) is cut off, i.e. the catalyst is split in half and its interior is bagged. The interior with its dust is melted together with the iron to form slag, which then sinks to the bottom of the melting furnace.
  • This slag contains the platinum, palladium and rhodium of the catalysts.
  • the slag is enriched, and the precious metals are dissolved from the enriched iron slag.
  • the increased utilization of metal catalysts has created the need for the recovery of the precious metals contained therein.
  • One example of this development is a catalyst barrel which is sawn up along its edges.
  • the metal cartridge is detached by sawing off the nail heads holding the roll.
  • the cartridge roll is detached from its nails and the clinch nail at the end of the band is detached.
  • the roll is placed vertically in a pin rotating freely around its axle.
  • the roll is pulled open and the band/bands are steered through two scratch brushes or rollers, so that the stabilizing medium and the precious metals are detached. After this the stabilizing medium is pulverized and homogenized.
  • This method does not, however, provide a sufficient recovery of the precious metals.
  • the scratch brushes cannot recover precious metals from all angles of the corrugated sheet.
  • different substances from the brushes like e.g. base metals, are mixed into the monolith to be purified, which substances are difficult to separate in the continued treatment.
  • the objective of the invention is to provide an improvement of the above mentioned disadvantages.
  • the embodiment of this solution is characterized in what is presented in the claims.
  • One of the main advantages of the subject invention is an improved recovery of the precious metals.
  • the separation of the precious metals does not require heat-treatment or dissolving of the whole catalyst. Mechanical separation can be utilized to a high extent.
  • fig. 1 presents a cross-section of a metal catalyst
  • fig. 2 presents an enlargement of point A of fig. 1
  • fig. 3 presents the apparatus for recovery of precious metals from a catalyst.
  • Fig. 1 presents schematically a rolled metal catalyst, comprising consecutively a straight and corrugated thin band inside the case 1.
  • the spot indicated by an arrow in fig. 1 has been enlarged to show schematically the structure of the catalyst.
  • the corrugated or non-corrugated band 6, 7 com ⁇ prises the following layers, e.g. the carrier medium layer 2 (e.g. steel), having at least on one side a stabilizing medium layer 3 (e.g. Al 2 0 3 ) containing precious metal parti- cles 4.
  • the carrier medium layer 2 e.g. steel
  • stabilizing medium layer 3 e.g. Al 2 0 3
  • the roll 5 is opened by detaching possible fixing nails or pins.
  • One roll contains approx. 10 m of band.
  • the straight and corrugated bands are separated from each other and fed into two consecutive rollers.
  • Each roller is formed of cylinders 9, 10, 11, 12, coated e.g. favorably by steel shells, and rotating in opposite directions on parallel axles.
  • the cylinders 9, 10 of the first roller, in between which the band is first fed, have been arranged to rotate at a lower speed than the cylinders 11, 12 of the latter roll ⁇ er, and the surfaces of these cylinders can be notched for the adhesion of the band.
  • the axle of the one cylinder is e.g.
  • the gap of the roller can thus be adjusted to properly press and transport the band.
  • the band 6 or 7 is fed into the gap 13 of the first roller.
  • the band 1 is rolled between the roller cylin- ders 9, 10.
  • the head of the band has advanced through the first roller, it is between the rollers in the interme ⁇ diate space 14, and is there supported by the abutment 15, which at the same time steers the band 6, 7 to the gap 16 of the second roller.
  • the band proceeds to the second roller rotating faster than the first one, causing tension in the band by which it stretches and tears or breaks, and the carrier medium layer is detached by the stretching from the band surface.
  • the broken band pieces and the aluminum oxide are removed after the second roller or already in the inter ⁇ mediate space ends, which are open. It is also possible to provide the intermediate space with holes, through which part of the material can be recovered.
  • the second roller is favorably in a lower position than the first roller, to enable a better passage of the crushed products.
  • the rota ⁇ tion speed of the cylinders of the second roller is 1,5 - 2,5, favorably 1,7 - 2,3, and more favorably approx. 2 times faster than the cylinders of the first roller. Possible dust of the crushing is collected into a dust filter, which is occasionally washed to recover the precious metals.
  • the carrier medium, the stabilizing medium and the precious metal particles separated in the roller treatment are gath ⁇ ered together.
  • the carrier medium is separated from the stabilizing medium and the metal particles in the water wash and with proper sedimentation treatment and by rubbing the surfaces during the washing.
  • the carrier medium, stabilizing medium and the precious metals that passed the crushing phase are fed for the water wash to e.g. a drum 20, rotating in a closed water circula ⁇ tion.
  • the drum is a cylinder rotating around its longitudi ⁇ nal axis having ends 21, 22 with openings for the feeding and the discharge.
  • the interior surface of the drum which is not presented, has packing balks for the lifting of the material to be washed from the interior surface of the drum when the drum is rotating.
  • the carrier medium is steered to the sedimentation basin 24, on the bottom of which is collected the carrier medium pieces that pass through the grating, and from which the sludge is pumped to the settling basin 25, which intake gap 26 is closer to the bottom of the basin 25 than the upper part.
  • the sludge is let to pass as e.g. an overflow from the vessel back to the drum to enable the sedimentation.
  • the carrier medium is separated in this wash and remains inside the drum.
  • the sedimentation product acquired from the sludge at the bottom of the settling basin contains aluminum oxide and precious metals, which can be recovered in the basin 27, and thereaf ⁇ ter dried for post-treatment.
  • the band hardened in the roller treatment is dispersed into small pieces of the size of a finger nail. The recovery of precious metals with this method at this stage is almost 100%. Conventional dissolving processes are thereafter used for the separation of the precious metals.
  • a craftsman can naturally modify the sedimentation and settling phases and times as required without essentially affecting the invention.
  • Effective cyclones or corresponding can be used in the sedimentation and settling phases.
  • the band is stretched so that it breaks into pieces and so that the stretching detaches the catalyst metal.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Catalysts (AREA)

Abstract

A method and an apparatus for recovering platinum group metals from a metal catalyst are disclosed, in order to separate the substrate containing the metal catalyst from the carrier, the sheets of the catalyst package are unwound. The sheets are then crushed by feeding them through the gap of a pair of rollers. Also disclosed are a method and an apparatus for wet separating the carrier from the substrate after a first separation has been made. The carrier and substrate particles, containing metal catalyst, are brought in rubbing contact. The coarse and fine particles are separated from one another. The fine particles are further treated for recovery of the metal catalyst.

Description

RECOVERY METHOD OF PLATINUM GROUP METALS AND AN APPARATUS THEREFOR
The invention relates to a method of recovering platinum metals and an apparatus therefor.
The emission of car exhaust gases has today to be restrict¬ ed, and catalysts are being used for this purpose. The objective of the catalyst is to bind hydrocarbons, nitric oxides and carbon monoxide. The basic structure of the catalyst comprises a carrier, a stabilizing medium and the catalyst metals. Precious metal particles Pt, Pd, Rh are attached to the carrier to provide the catalytic oxidation and reduction. The oxidation of the incombustible hydrocar- bons and the carbon monoxide and the reduction of the nitric oxides take place in the metal particles on the stabilizing medium surface. The carrier medium of the catalyst is a ceramic or metallic monolith. The ceramic carriers are impact sensitive having an equally sized reactive substance area than the metallic ones, wherefore more and more metal¬ lic carriers are today being used. The metallic monoliths are produced of high-temperature resistant ferritic chromic aluminum steel. The metal carrier is made of steel foil with a thickness of approx. 0,05 mm, which is corrugated and rolled. The stabilizing medium is spread on the surface of the battery. The precious metals are absorbed into the stabilizing medium as aqueous solution and reduced by hydro¬ gen. The battery is thereafter placed into a metal case.
The size, amount and dimensions of the catalysts are chosen to suit the respective car and motor. The recovery catalysts can therefore have the same differences.
Generally, when recovering platinum metals, the catalyst (catalyzer) is cut off, i.e. the catalyst is split in half and its interior is bagged. The interior with its dust is melted together with the iron to form slag, which then sinks to the bottom of the melting furnace. This slag contains the platinum, palladium and rhodium of the catalysts. The slag is enriched, and the precious metals are dissolved from the enriched iron slag.
It has been noticed that such a recovery of precious metals is fairly expensive and energy consuming when melting the catalysts, because the whole catalyst is melted. The inven¬ tion aims at reducing the chemical treatment so that the carrier media need not to be melted or dissolved. The mass requiring chemical treatment is thus considerably smaller.
The increased utilization of metal catalysts has created the need for the recovery of the precious metals contained therein. One example of this development is a catalyst barrel which is sawn up along its edges. The metal cartridge is detached by sawing off the nail heads holding the roll. The cartridge roll is detached from its nails and the clinch nail at the end of the band is detached. The roll is placed vertically in a pin rotating freely around its axle. The roll is pulled open and the band/bands are steered through two scratch brushes or rollers, so that the stabilizing medium and the precious metals are detached. After this the stabilizing medium is pulverized and homogenized. This method does not, however, provide a sufficient recovery of the precious metals. The scratch brushes cannot recover precious metals from all angles of the corrugated sheet. Moreover, different substances from the brushes, like e.g. base metals, are mixed into the monolith to be purified, which substances are difficult to separate in the continued treatment.
The objective of the invention is to provide an improvement of the above mentioned disadvantages. The embodiment of this solution is characterized in what is presented in the claims.
One of the main advantages of the subject invention is an improved recovery of the precious metals. The separation of the precious metals does not require heat-treatment or dissolving of the whole catalyst. Mechanical separation can be utilized to a high extent.
The invention is below described with reference to the enclosed drawing, in which
fig. 1 presents a cross-section of a metal catalyst; fig. 2 presents an enlargement of point A of fig. 1; fig. 3 presents the apparatus for recovery of precious metals from a catalyst.
Fig. 1 presents schematically a rolled metal catalyst, comprising consecutively a straight and corrugated thin band inside the case 1. The spot indicated by an arrow in fig. 1 has been enlarged to show schematically the structure of the catalyst. The corrugated or non-corrugated band 6, 7 com¬ prises the following layers, e.g. the carrier medium layer 2 (e.g. steel), having at least on one side a stabilizing medium layer 3 (e.g. Al203) containing precious metal parti- cles 4.
When the catalyst has been cut i.e. split loose from its case 1, the roll 5 is opened by detaching possible fixing nails or pins. One roll contains approx. 10 m of band. The straight and corrugated bands are separated from each other and fed into two consecutive rollers. Each roller is formed of cylinders 9, 10, 11, 12, coated e.g. favorably by steel shells, and rotating in opposite directions on parallel axles. The cylinders 9, 10 of the first roller, in between which the band is first fed, have been arranged to rotate at a lower speed than the cylinders 11, 12 of the latter roll¬ er, and the surfaces of these cylinders can be notched for the adhesion of the band. The axle of the one cylinder is e.g. fixed mounted in bearings to the frame, the axle of the other cylinder leans against steady springs. The gap of the roller can thus be adjusted to properly press and transport the band. The band 6 or 7 is fed into the gap 13 of the first roller. The band 1 is rolled between the roller cylin- ders 9, 10. When the head of the band has advanced through the first roller, it is between the rollers in the interme¬ diate space 14, and is there supported by the abutment 15, which at the same time steers the band 6, 7 to the gap 16 of the second roller. The band proceeds to the second roller rotating faster than the first one, causing tension in the band by which it stretches and tears or breaks, and the carrier medium layer is detached by the stretching from the band surface. The broken band pieces and the aluminum oxide are removed after the second roller or already in the inter¬ mediate space ends, which are open. It is also possible to provide the intermediate space with holes, through which part of the material can be recovered. The second roller is favorably in a lower position than the first roller, to enable a better passage of the crushed products. The rota¬ tion speed of the cylinders of the second roller is 1,5 - 2,5, favorably 1,7 - 2,3, and more favorably approx. 2 times faster than the cylinders of the first roller. Possible dust of the crushing is collected into a dust filter, which is occasionally washed to recover the precious metals.
The carrier medium, the stabilizing medium and the precious metal particles separated in the roller treatment are gath¬ ered together. The carrier medium is separated from the stabilizing medium and the metal particles in the water wash and with proper sedimentation treatment and by rubbing the surfaces during the washing.
The carrier medium, stabilizing medium and the precious metals that passed the crushing phase, are fed for the water wash to e.g. a drum 20, rotating in a closed water circula¬ tion. The drum is a cylinder rotating around its longitudi¬ nal axis having ends 21, 22 with openings for the feeding and the discharge. The interior surface of the drum, which is not presented, has packing balks for the lifting of the material to be washed from the interior surface of the drum when the drum is rotating. The discharged sludge from the drum 20, provided at its discharge end with a grating. having a mesh size of e.g. lxl mm to prevent the discharge of the coarse material, i.e. mainly the carrier medium, is steered to the sedimentation basin 24, on the bottom of which is collected the carrier medium pieces that pass through the grating, and from which the sludge is pumped to the settling basin 25, which intake gap 26 is closer to the bottom of the basin 25 than the upper part. The sludge is let to pass as e.g. an overflow from the vessel back to the drum to enable the sedimentation. The carrier medium is separated in this wash and remains inside the drum. The sedimentation product acquired from the sludge at the bottom of the settling basin contains aluminum oxide and precious metals, which can be recovered in the basin 27, and thereaf¬ ter dried for post-treatment. The band hardened in the roller treatment is dispersed into small pieces of the size of a finger nail. The recovery of precious metals with this method at this stage is almost 100%. Conventional dissolving processes are thereafter used for the separation of the precious metals.
A craftsman can naturally modify the sedimentation and settling phases and times as required without essentially affecting the invention. Effective cyclones or corresponding can be used in the sedimentation and settling phases. The band is stretched so that it breaks into pieces and so that the stretching detaches the catalyst metal.

Claims

1. A method of recovering precious metals from metal cata¬ lysts, in which method the case and interior of the cata- lyst, containing the carrier medium and the stabilizing medium, having the catalyst metals, are separated from each other, the interior is decoiled to a band or bands, characterized in that the band is crushed to separate the stabilizing medium and the carrier medium from each other.
2. A method according to claim 1, characterized in that the bands are fed through the roller, and that the bands are fed through the gap of two subsequent rollers, and the rotation speed of the cylinders of the first roller is smaller than the cylinders of the latter roller.
3. A method according to claim 2, characterized in that the rotation speed of the cylinders of the latter roller is
1,5 - 2,5, favorably 1,7 - 2,3 and more favorably approx. 2 times faster than the speed of the cylinders of the first roller.
4. A method according to one of the previous claims, characterized in that the bands are stretched between two cylinders so that the material coated on the band surfaces is detached.
5. A method according to one of the previous claims, characterized in that the corrugated bands and the non- corrugated bands are fed separately.
6. A method according to one or several of the previous claims, characterized in that the band containing the cata¬ lyst is stretched to detach the catalyst from the band.
7. An apparatus for the recovery of precious metals from a metal catalyst, which apparatus comprises means for the separation of the catalyst's case and interior, containing the carrier medium, the stabilizing medium and the catalyst metals, means for decoiling the interior to a band or bands, characterized in the crushing of the band.
8. An apparatus according to claim 7, characterized in that for the crushing of the band, two rollers are placed in close proximity in sequence, so that when the end of the band reaches the gap of the latter roller, the band is still attached to the first roller.
9. An apparatus according to claim 8, characterized in that the rotation speed of the cylinders of the latter roller is bigger than speed of the cylinders of the first roller, so that speed of the cylinders of the latter roller is 1,5 - 2,5, favorably 1,7 - 2,3 and more favorably approx. 2 times bigger than the speed of the cylinders of the first roller.
10. An apparatus according to claims 8 or 9, characterized in that the cylinders of the second, i.e. the latter roller are notched.
11. A method of separating a carrier medium of a metal catalyst from the stabilizing medium, containing essentially the metal catalysts, and which carrier medium is essentially detached from the stabilizing medium, characterized in that the granules of the carrier medium and the stabilizing medium, containing the metal catalysts, are brought into rubbing contact, the coarse and fine particles are separated from each other, the suspension of fine particles and liquid are settled, by which the small particles contain the metal catalysts and the stabilizing medium.
12. A method according to claim 11, characterized in that the granules are washed in liquid to provide the contact between the surfaces.
13. A method according to claims 10, 11 or 12, characterized in that possible carrier medium pieces escaped from the washing phase are collected into a drainage basin, the suspension sludge is led to the settling basin, the stabi¬ lizing medium is settled in the settling basin and the stabilizing medium is collected as sludge from the bottom of the settling basin.
14. An apparatus for separating a carrier medium of a metal catalyst from the stabilizing medium, containing essentially the metal catalysts, and which carrier medium is essentially detached from the stabilizing medium, characterized in that for the carrier medium and the stabilizing medium, contain¬ ing the metal catalysts, is provided a washing space for the washing of these together in liquid while rubbing against each other, separation devices for the coarse and fine particles, settling devices for the fine particles and the liquid suspension, by which the small particles contain the metal catalysts and the stabilizing medium.
15. An apparatus for separating a carrier medium of a metal catalyst from the stabilizing medium, containing the metal catalysts, and which carrier medium is mechanically separat¬ ed from the stabilizing medium, characterized in that the apparatus comprises a drum that can be rotated, provided with ends having a feed opening at one end and a discharge opening at the other end, with an obstacle to prevent the discharge of material of a certain bigger granule size from the drum, a sedimentation basin for the collection of coarse granules coming from the outlet, a settling basin in connec¬ tion with the sedimentation basin, and provided with a connection to its lower part, through which the sludge flown through the drum outlet is pumped to the settling basin, in which the stabilizing material essentially mixed with liquid remains at the bottom of the settling basin, and the liquid essentially separated from the stabilizing medium flows back through the drum feed opening to the drum.
16. A method according to claims 10-15, characterized in that the coarse and fine particles are separated in two phases, i.e. by screening and grading.
17. A method according to claims 1 or 11, characterized in that the end product/products according to claim 1 is treat- ed according to claim 11.
PCT/FI1995/000008 1994-01-11 1995-01-11 Method of recovering platinum metals and an apparatus therefor Ceased WO1995018870A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI940135A FI940135A7 (en) 1994-01-11 1994-01-11 Method and apparatus for recovering platinum metal
FI940135 1994-01-11

Publications (1)

Publication Number Publication Date
WO1995018870A1 true WO1995018870A1 (en) 1995-07-13

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WO (1) WO1995018870A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MD4131C1 (en) * 2010-10-25 2012-05-31 Государственный Университет Молд0 Device for palladium extraction from spent automotive catalysts

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Publication number Priority date Publication date Assignee Title
US4074865A (en) * 1973-09-11 1978-02-21 Johnson, Matthey & Co., Limited Method of recovering platinum group metal values from a used washcoated catalyst
GB2067599A (en) * 1979-12-31 1981-07-30 Johnson Matthey Co Ltd Recovery of Pt group metals
DE3223689C1 (en) * 1982-06-25 1983-09-29 Günther 5628 Heiligenhaus Unger Process and apparatus for the recovery of metallic parts from combustion and/or pyrolysis residues, especially from rubbish incineration
JPH01189347A (en) * 1988-01-21 1989-07-28 Cataler Kogyo Kk Recovery of platinum group metal from purification catalyst for exhaust gas of automobile
DE3844214C1 (en) * 1988-12-29 1990-06-07 Heinrich Ing.(Grad.) 4600 Dortmund De Molde Process for the recovery of rare metals from catalysts
DE4105224C1 (en) * 1991-02-20 1992-02-27 H.J.S. Fahrzeugteile-Fabrik Gmbh & Co, 5750 Menden, De Recovery of precious metal(s) from catalyst - comprises coating ceramic oxide on metal foil which is detachable
DE4122717A1 (en) * 1991-07-09 1993-01-21 Ear Gmbh Recovery of precious metals from automotive catalytic converter - includes crushing metallic substrate and coatings into particles of differing weight, shape, and size and mechanically sepg. the precious particles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074865A (en) * 1973-09-11 1978-02-21 Johnson, Matthey & Co., Limited Method of recovering platinum group metal values from a used washcoated catalyst
GB2067599A (en) * 1979-12-31 1981-07-30 Johnson Matthey Co Ltd Recovery of Pt group metals
DE3223689C1 (en) * 1982-06-25 1983-09-29 Günther 5628 Heiligenhaus Unger Process and apparatus for the recovery of metallic parts from combustion and/or pyrolysis residues, especially from rubbish incineration
JPH01189347A (en) * 1988-01-21 1989-07-28 Cataler Kogyo Kk Recovery of platinum group metal from purification catalyst for exhaust gas of automobile
DE3844214C1 (en) * 1988-12-29 1990-06-07 Heinrich Ing.(Grad.) 4600 Dortmund De Molde Process for the recovery of rare metals from catalysts
DE4105224C1 (en) * 1991-02-20 1992-02-27 H.J.S. Fahrzeugteile-Fabrik Gmbh & Co, 5750 Menden, De Recovery of precious metal(s) from catalyst - comprises coating ceramic oxide on metal foil which is detachable
DE4122717A1 (en) * 1991-07-09 1993-01-21 Ear Gmbh Recovery of precious metals from automotive catalytic converter - includes crushing metallic substrate and coatings into particles of differing weight, shape, and size and mechanically sepg. the precious particles
US5279464A (en) * 1991-07-09 1994-01-18 Ear European Autocat Recycling Gmbh Method of and apparatus for recycling catalytic converters

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Title
PATENT ABSTRACTS OF JAPAN, Vol. 87, No. 309487, C87-131734; & JP,A,62 216 924 (NISSAN ENG KK), 24 September 1987. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MD4131C1 (en) * 2010-10-25 2012-05-31 Государственный Университет Молд0 Device for palladium extraction from spent automotive catalysts

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Publication number Publication date
FI940135L (en) 1995-07-12
FI940135A0 (en) 1994-01-11
FI940135A7 (en) 1995-07-12

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