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WO2018065126A1 - Procédé de séparation de métal noble à partir d'un matériau réfractaire particulaire renfermant du métal noble - Google Patents

Procédé de séparation de métal noble à partir d'un matériau réfractaire particulaire renfermant du métal noble Download PDF

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Publication number
WO2018065126A1
WO2018065126A1 PCT/EP2017/058911 EP2017058911W WO2018065126A1 WO 2018065126 A1 WO2018065126 A1 WO 2018065126A1 EP 2017058911 W EP2017058911 W EP 2017058911W WO 2018065126 A1 WO2018065126 A1 WO 2018065126A1
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WO
WIPO (PCT)
Prior art keywords
refractory material
noble metal
particulate
reaction zone
gas
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/EP2017/058911
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German (de)
English (en)
Inventor
Christian KRAUSHAAR
Holger Winkler
Peter Schäfer
Jan RÖDER
Christoph Röhlich
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.)
Heraeus Deutschland GmbH and Co KG
Original Assignee
Heraeus Deutschland GmbH and Co KG
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 Heraeus Deutschland GmbH and Co KG filed Critical Heraeus Deutschland GmbH and Co KG
Publication of WO2018065126A1 publication Critical patent/WO2018065126A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C22B11/042—Recovery of noble metals from waste materials
    • C22B11/048—Recovery of noble metals from waste materials from spent catalysts
    • 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
    • C22B11/06—Chloridising
    • 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 process for the separation of noble metal from particulate refractory material containing precious metals.
  • US 2,860,045 discloses the separation of platinum from a platinum-containing alumina support material by contacting it with gaseous aluminum chloride optionally in combination with a diluting carrier gas such as helium, nitrogen, chlorine, carbon dioxide, air, carbon monoxide, etc.
  • a diluting carrier gas such as helium, nitrogen, chlorine, carbon dioxide, air, carbon monoxide, etc.
  • Virtually complete separation of noble metal means that the precious metal content of a particulate refractory material containing precious metals has a typical starting value of the order of, for example, 0.01 to 5 wt% or 0.1 to 5 wt% to a residual content of the order of 10, for example is reduced to 900 ppm by weight, in particular to a residual content, which can not be further reduced from an economic point of view, of the order of, for example, 10 to 200 ppm by weight.
  • the object can be achieved with the method disclosed below for the separation of noble metal from particulate refractory material containing precious metals. The method comprises the steps of: (1) providing particulate refractory material containing precious metals,
  • step (2) contacting the particulate noble metal-containing refractory material provided in step (1) with chlorine and gaseous aluminum chloride at a temperature in the range of 200 to 650 ° C, preferably 250 to 600 ° C, especially 300 to 500 ° C and in permanent mixing within a 200 to 650 ° C, preferably 250 to 600 ° C, in particular 300 to 500 ° C hot gas-flowed reaction zone, and
  • the term "permanently mixed” is used with reference to the particulate refractory refractory material treated in step 2. It means that during step (2) at least part of the particulate refractory refractory material in the reaction zone is constantly in motion. Preferably, the total amount of particulate noble metal-containing refractory material present in step (2) in the reaction zone is in motion or is being agitated while being mixed or circulated.
  • the contacting or treatment of the particulate refractory material containing refractory material during step (2) is effected with chlorine and gaseous aluminum chloride by comprising or substantially consisting of a stream of a gas mixture in the gas flowing through the reaction zone gaseous aluminum chloride, chlorine and optionally inert gas.
  • the process of the invention then comprises the steps of: (1) providing particulate refractory material containing precious metals,
  • step (2) contacting the temperature provided in step (1) in the range of 200 to 650 ° C, preferably 250 to 600 ° C, especially 300 to 500 ° C containing and in permanent mixing particulate refractory metal refractory material comprising a stream of a gas mixture comprising or consisting essentially of gaseous aluminum chloride, chlorine and optionally inert gas within a 200 to 650 ° C, preferably 250 to 600 ° C, especially 300 to 500 ° C hot reaction zone , and
  • particulate refractory material whose surface and / or pore surface is coated with precious metal and / or which is present in the form of a mixture associated with noble metal particles, in other words, the particulate refractory material serves as the particulate refractory material
  • non-metty metal or "precious metal-containing” is used herein unless otherwise stated, these terms refer to a single precious metal or a combination of different precious metals each selected from the group consisting of silver, gold, rhenium, ruthenium, osmium, iridium, platinum, palladium and rhodium, in particular selected from the group consisting of platinum, palladium and rhodium.
  • Particulate refractory material or particles of refractory material are particles of inorganic non-metallic and against exposure to chlorine and aluminum chloride at high temperatures, for example in the range of 200 to
  • this may be ceramic refractory material
  • suitable refractory materials may for example be selected from the group consisting of aluminum oxides such as ⁇ - or ⁇ -alumina , Titanium dioxide, silicon dioxide, magnesium oxide, zirconium oxides, mixed oxides such as cerium / zirconium mixed oxides, silicates such as aluminum silicates (eg cordierite, mullite, zeolites), titanates such as Aluminum titanate, lead zirconate titanate and barium titanate, silicon carbides and silicon nitrides.
  • the refractory materials may be doped, for example, with non-noble metals.
  • the refractory materials as such are free from precious metals.
  • the refractory materials may be alone or in combination, for example, as mixtures of different particulate refractory materials and / or in intraparticle combination. In general, the particles of refractory material are porous.
  • non-precious metals as used herein by those skilled in the art as noble metal-free except for a precious metal or noble metal residual content technically practically unavoidable for a particular material, for example in the range of> 0 to 10 ppm by weight.
  • particulate refractory material containing precious metals is provided, for example in the form of one or a mixture of several different types of noble metal-containing refractory particles or in the form of a mixture of noble metal-free and noble metal-containing respectively refractory particles or in the form of a mixture of noble metal particles and noble metal-free and / or or noble metal-containing refractory particles.
  • a mixture of noble metal-free and noble metal-containing respectively refractory particles or a mixture of noble metal particles and noble metal-free and / or noble metal-containing refractory particles may be a deliberately prepared mixture; in general, however, this is not the case and such a mixture may have arisen for technical reasons.
  • the particles of noble metal-containing refractory material may be customary shaped bodies (such as granules, pellets or extrudates such as cylinders, rings, spheres, cuboids, platelets).
  • the diameters or the sizes of such shaped bodies can be, for example, in the range from 1 to 30, preferably 1 to 20, in particular 1 to 15 millimeters.
  • the lower limit of diameter or size is 4 millimeters.
  • the diameter of the molded body at its thickest Position in the range of 1 to 30, preferably 1 to 20, in particular 1 to 15 millimeters; preferably here is the lower limit of the diameter at 4 millimeters.
  • the absolute particle size can be, for example, in the range from 3 to 500 ⁇ m.
  • examples of such other refractory refractory material particles other than molded articles are comminuted (spent) heterogeneous catalysts, comminuted slag, precious metal dross, dried and comminuted sludge, shredded electronic waste, crushed mine concentrate, and crushed mine waste.
  • the noble metal content of the particulate refractory material provided in step (1) is, for example, in the range of 0.01 to 10% by weight or 0.01 to 5% by weight or, preferably, in the range of 0.1 to 5% by weight. , in each case based on the entire particulate refractory material containing precious metals.
  • the particulate refractory material containing precious metals may be a material or a combination of different materials selected from the group consisting of crushed slag, precious metal dross, dried and crushed sludge, shredded electronic waste, crushed mine concentrate, mined mine waste and noble metal-containing heterogeneous catalyst.
  • the particulate refractory material containing precious metals may be comminuted, e.g., ground, slag.
  • slag e.g., ground
  • noble metal-containing slags from a pyrometallurgical precious metal refining.
  • the particulate refractory material containing precious metals may be precious metal dross, for example precious metal dross from the jewelery or dental field.
  • the precious metal dross (s) may be pretreated. For example, they can an ashing and / or an extract with nitric acid and / or comminution, for example by Be subjected to grinding. By ashing, organic components can be removed, for example by pyrolysis and / or burning. Nitric acid-soluble substances, in particular nitric acid-soluble metals such as, for example, copper and silver, can be removed by an extraction with nitric acid.
  • the particulate refractory material containing precious metals may be dried and comminuted, for example ground, sludge, for example from a hydrometallurgical precious metal refining.
  • sludge for example from a hydrometallurgical precious metal refining.
  • the sludge or sludges may also have been calcined.
  • the particulate refractory material containing precious metals may be comminuted, for example ground, electronic scrap.
  • the electronic waste may also have been ashed or annealed. By annealing or ashing, organic components can be removed, for example by pyrolysis and / or burning.
  • the particulate refractory material containing precious metals may be comminuted, for example ground, mine-concentrate.
  • mine concentrates are noble metal mines originating, solid noble metal-containing and concentrated in terms of their precious metal content materials.
  • methods for concentration are conventional physical and / or chemical methods known to the person skilled in the art, such as, for example, flotation, pyrometallurgical melting methods and hydrometallurgical processes.
  • the particulate refractory material containing precious metals may be comminuted, for example ground, mine waste.
  • the particulate refractory material containing precious metals is noble metal-containing heterogeneous catalyst, in particular consumed noble metal-containing heterogeneous catalyst.
  • Noble metal-containing heterogeneous catalyst can derive from various sources. For example, it may be spent used noble metal heterogeneous catalyst to spent exhaust air purification catalyst; spent exhaust gas purifying catalyst; spent combustion exhaust gas purifying catalyst; consumed diesel particulate filter; consumed catalysts used for clean gas production; and / or spent process catalysts, for example from the chemical, pharmaceutical and petrochemical industries act.
  • process catalysts are Fischer-Tropsch catalysts, reforming catalysts, catalysts used in the production of ethylene oxide and hydrogenation catalysts.
  • Heterogeneous catalysts can be, for example, (i) in the form of a non-washcoated, but noble metal-containing refractory support material, (ii) in the form of a noble metal washcoat coating, but itself refractory support material or (iii) in the form of a washcoat containing precious metal itself likewise present refractory carrier material containing precious metals.
  • Washcoat coatings are known in the art; These are coatings which have been calcined after their application from so-called washcoat slurry and which contain or consist of noble metal-containing particles of refractory material.
  • Spent precious-metal-containing heterogeneous catalysts can be inherently particulate and sufficiently free of interfering impurities, so that they can be treated directly according to step (2) of the process according to the invention. Otherwise, they can first be comminuted by suitable methods known to those skilled in the art, for example ground and / or freed of undesired impurities, for example by calcining with or without admission of air. If appropriate, a reduction treatment, for example a thermal treatment in a reducing atmosphere, may be carried out in order not to convert into elemental noble metal in elemental form, but for example as noble metal oxide in the particulate refractory material containing precious metals.
  • step (2) of the process according to the invention the particulate refractory material provided in step (1) and having a temperature in the range from 200 to 650.degree. C., preferably from 250 to 600.degree. C., in particular from 300 to 500.degree with chlorine and gaseous aluminum chloride and optionally inert gas within a 200 to 650 ° C, preferably 250 to 600 ° C, in particular 300 to 500 ° C hot gas-flowed reaction zone in contact.
  • suitable inert gases are in particular nitrogen and noble gases such as argon.
  • Chlorine, the optional inert gas and gaseous aluminum chloride can each be introduced into the reaction zone individually and / or mixed.
  • the gases and / or the at least one gas mixture can be introduced in particular preheated in the reaction zone.
  • Gaseous aluminum chloride may also be formed in situ from solid aluminum chloride mixed with the particulate refractory particulate metal within the reaction zone.
  • step (2) of the preferred embodiment of the process according to the invention is 200 to 650 ° C, preferably 250 to 600 ° C, especially 300 to 500 ° C hot reaction zone with a stream of a gas mixture comprising or consisting essentially of gaseous aluminum chloride, chlorine and optionally traversed by inert gas.
  • the gas mixture is 200 to 650 ° C, preferably 250 to 600 ° C, in particular 300 to 500 ° C hot, ie correspondingly preheated in the 200 to 650 ° C, preferably 250 to 600 ° C, in particular 300 to 500 ° C hot Reaction zone initiated.
  • the gas mixture can be generated separately.
  • the gas mixture comprises gaseous aluminum chloride, chlorine and optionally inert gas, preferably it consists essentially of gaseous aluminum chloride, chlorine and optionally inert gas.
  • inert gas is contained in the gas mixture.
  • the proportion by weight of the gaseous aluminum chloride in the gas mixture is, for example, in the range from 10 to 80% by weight. %, preferably 30 to 70 wt .-%, of chlorine, for example in the range of 10 to 40 wt .-%, preferably 15 to 30 wt .-% and that of the inert gas, for example in the range of 0 to 80 wt .-%, preferably 10 to 50 wt .-%.
  • the reaction zone is 200 to 650 ° C, preferably 250 to 600 ° C, especially 300 to 500 ° C hot. All substances contained therein, ie chlorine, gaseous aluminum chloride and the permanently mixed particulate noble metal-containing refractory material, but also the optional inert gas and forming reaction in the reaction zone have the prevailing temperature in the range of 200 to 650 ° C, preferably 250 to 600 ° C, in particular 300 to 500 ° C or accept these.
  • the gas stream flowing through the reaction zone may have a volume flow in the range of, for example, 5 to 15 liters per hour and per kg of particulate refractory refractory material (ie, per kg particulate refractory refractory material within the reaction zone).
  • the pressure can be in a range from atmospheric pressure to 1, 5 times its.
  • a temperature in the range of 200 to 650 ° C, preferably 250 to 600 ° C, in particular 300 to 500 ° C and having permanent mixing particulate noble metal-containing refractory material with chlorine and gaseous aluminum chloride within the 200 to 650 ° C, preferably 250 to 600 ° C, in particular 300 to 500 ° C hot gas-flow reaction zone can already begin during the heating of the particulate refractory refractory material or only after reaching the desired temperature in the particulate refractory material containing precious metals. Likewise, it is possible to proceed with the permanent mixing of the particulate refractory material containing the invention.
  • the heating of the particulate refractory material containing refractory material can be assisted by permanent mixing or one begins with the permanent mixing only after reaching the desired temperature in the particulate refractory material containing precious metals.
  • the permanent mixing happens mechanically. Prefers In this case, a stirring up of particulate refractory material containing precious metals is avoided.
  • the permanent mixing is effected using a rotary kiln known per se as a working medium.
  • the rotary kiln is also used for heating or holding the particulate refractory material containing refractory at the desired temperature in the range of 200 to 650 ° C, preferably 250 to 600 ° C, especially 300 to 500 ° C.
  • the rotary kiln has resistant inner walls or liners to chlorine and aluminum chloride at 200 to 650 ° C, for example of quartz glass, nickel-based alloy (for example Hastelloy® C) or suitable inorganic non-metallic refractory material such as graphite.
  • the rotary kiln can be operated horizontally or inclined, for example, with an inclination of up to 12 ° relative to the horizontal.
  • the rotary kiln or the dimensions of the rotary kiln, the expert will choose adapted to the amount of the particulate refractory material to be treated.
  • the length and the diameter of the rotary kiln chamber can be, for example, in the range of 0.5 to 10 meters or 10 to 100 cm.
  • the rotary kiln room is a cylindrical reaction zone.
  • the peripheral speed (peripheral speed of the inner wall of the rotary kiln chamber) is to be selected so that the rotational movement ensures the essential permanent mixing of the particulate refractory material, but to exert centrifugal forces on the particulate noble metal-containing refractory without significant material buildup on the rotating inner wall.
  • the peripheral speed may be in the range of 1 to 25 cm / s.
  • the contact or treatment duration of the permanently mixed particulate noble metal-containing refractory material with chlorine and gaseous aluminum chloride within the hot gas-flow reaction zone is usually chosen so that a separation of the noble metal from the particulate refractory metal refractory material to the desired residual content or to the liberation of
  • the required contact or treatment time is usually in the range of, for example, 10 to 240 minutes, in particular 15 to 120 minutes to avoid misunderstandings, in the case of using a rotary kiln corresponds to the contact or treatment time of the particulate refractory material refractory material whose residence time in the reaction zone forming actual rotary kiln space.
  • the space in which the heating of the particulate refractory material containing refractory material takes place is also used as the reaction zone.
  • the preferred reaction zone is, for example, the cylindrical interior of the rotary kiln previously disclosed above as the preferred working medium, in other words, the rotary kiln chamber.
  • the inventive method can also be carried out continuously, preferably such that on the conveying speed of the particulate refractory material refractory material through the reaction zone through its contact or Treatment time can be adjusted with the chlorine and the gaseous aluminum chloride.
  • the reaction zone houses a simple reaction system which comprises or essentially consists of the reactants noble metal, chlorine and gaseous aluminum chloride.
  • the gas stream flowing through the reaction zone flows over and partly through the permanently mixed particulate refractory material containing precious metals, which assists in the contact of particulate refractory material containing precious metals with chlorine and gaseous aluminum chloride.
  • At the temperatures prevailing in the reaction zone in the range from 200 to 650 ° C., preferably from 250 to 600 ° C., in particular from 300 to 500 ° C., form gaseous aluminum, chlorine and noble metal-containing compounds, presumably aluminum and noble metal-containing chloride complexes.
  • the gaseous aluminum, Chlorine and noble metal-containing compounds are entrained with the in step (3) derived from the reaction zone hot gas stream.
  • the permanent mixing of the particulate refractory material according to the invention permits the efficient separation of precious metal from particulate precious metal-containing refractory material formulated at the outset as a task, not only with respect to the treatment of large quantities of particulate refractory material containing refractory material in a short time but also with regard to achieving a uniformly low residual noble metal content in the particulate refractory material treated in accordance with the invention when viewed at the single particle level.
  • the process according to the invention allows up to more than 99% by weight of the noble metal originally present on or in the particulate refractory material containing precious metals to be removed.
  • a gas flow ie. the gas stream which has flowed through or flowed through the reaction zone, derived from this when leaving the reaction zone.
  • the gas stream leaves the 200 to 650 ° C, preferably 250 to 600 ° C, especially 300 to 500 ° C hot reaction zone with appropriate temperature and can be derived in a formation and deposition of solid noble metal chloride permitting colder area, for example in an area with opposite the constituents of the gas stream resistant inner surfaces and with lower temperatures than those prevailing in the reaction zone.
  • said lower temperatures may be in the range of, for example, 180 to ⁇ 300 ° C.
  • the aluminum, chlorine and noble metal-containing compounds entrained in the gas stream decompose releasing noble metal chloride, while passing inert gas, unused chlorine and gaseous aluminum chloride, for example, into a gas scrubber.
  • the freed from the noble metal or noble metal chloride or depleted gas stream of the reaction zone in the sense of circulation can be supplied again.
  • the desired Gas composition can be adjusted by supply due to chlorine consumption missing portions of chlorine and optionally also aluminum chloride.
  • the deposited noble metal chloride may be sorted or obtained as a mixture of different noble metal chlorides.
  • noble metal chlorides are PtC, PdC and RhCb.
  • the one or more deposited noble metal chlorides can be fed to a conventional treatment, for example a wet chemical treatment.
  • EXAMPLE 1 6000 g of a ground catalyst (porous alumina support, platinum content 0.15% by weight) were placed in a rotary kiln operated at a horizontal inclination of 3 ° (75 cm long cylindrical 500 ° C. hot reaction zone with an inner diameter of 12 cm, peripheral speed of Inner wall of the reaction zone 7.5 cm / s) with a flowing through the reaction zone gas mixture (67 wt .-% gaseous aluminum chloride, 18 wt .-% chlorine, 15 wt .-% nitrogen, volume flow of 70 liters / h) treated (contact time for the catalyst material for 1 hour at 500 ° C).
  • a ground catalyst porous alumina support, platinum content 0.15% by weight
  • Example 1 was repeated with the only difference that the rotary kiln stopped during the treatment. From the gas leaving the reaction zone, 34% of the platinum originally contained in the milled catalyst was added as PtC recovered; 66% of the platinum originally contained in the milled catalyst remained in the catalyst material.
  • 6000 g of a milled catalyst (porous alumina carrier, palladium content 0.1 wt .-%) were in a operated with a horizontal tilt of 3 ° rotary kiln (75 cm long cylindrical 400 ° C hot reaction zone with an inner diameter of 12 cm, peripheral speed of the inner wall of Reaction zone 7.5 cm / s) with a flowing through its reaction zone gas mixture (67 wt .-% gaseous aluminum chloride, 18 wt .-% chlorine, 15 wt .-% nitrogen, volume flow of 70 liters / h) treated (contact time for the Catalyst material for 1 hour at 400 ° C).
  • Example 3 was repeated with the only difference that the rotary kiln stopped during the treatment. From the gas leaving the reaction zone, 81% of the palladium originally contained in the milled catalyst was recovered as PdC; 19% of the palladium originally contained in the milled catalyst remained in the catalyst material.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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  • Catalysts (AREA)
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Abstract

Procédé de séparation de métal noble à partir d'un matériau réfractaire particulaire renfermant du métal noble, comprenant les étapes suivantes : (1) préparation d'un matériau réfractaire particulaire renfermant du métal noble (2), mise en contact du matériau réfractaire particulaire préparé à l'étape (1), présentant une température comprise dans une plage 200 à 650°C et brassé en permanence, avec du chlore et du chlorure d'aluminium gazeux, dans une zone de réaction à circulation de gaz présentant une température de 200 à 650°C, et (3) dérivation d'un flux de gaz hors de la zone de réaction.
PCT/EP2017/058911 2016-10-07 2017-04-13 Procédé de séparation de métal noble à partir d'un matériau réfractaire particulaire renfermant du métal noble Ceased WO2018065126A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16192810 2016-10-07
EP16192810.6 2016-10-07

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WO2018065126A1 true WO2018065126A1 (fr) 2018-04-12

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PCT/EP2017/058911 Ceased WO2018065126A1 (fr) 2016-10-07 2017-04-13 Procédé de séparation de métal noble à partir d'un matériau réfractaire particulaire renfermant du métal noble

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828200A (en) * 1955-07-25 1958-03-25 Universal Oil Prod Co Method of removing platinum from a composite containing platinum and alumina
US2860045A (en) 1955-07-25 1958-11-11 Universal Oil Prod Co Method of removing platinum from a composite containing platinum and alumina
EP2985354A1 (fr) * 2014-11-10 2016-02-17 Heraeus Deutschland GmbH & Co. KG Procédé d'extraction de métal précieux à partir de support de catalyseur contenant des métaux précieux

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828200A (en) * 1955-07-25 1958-03-25 Universal Oil Prod Co Method of removing platinum from a composite containing platinum and alumina
US2860045A (en) 1955-07-25 1958-11-11 Universal Oil Prod Co Method of removing platinum from a composite containing platinum and alumina
EP2985354A1 (fr) * 2014-11-10 2016-02-17 Heraeus Deutschland GmbH & Co. KG Procédé d'extraction de métal précieux à partir de support de catalyseur contenant des métaux précieux

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DONG HAIGANG ET AL: "Recovery of platinum group metals from spent catalysts: A review", INTERNATIONAL JOURNAL OF MINERAL PROCESSING, vol. 145, 7 June 2015 (2015-06-07), pages 108 - 113, XP029313833, ISSN: 0301-7516, DOI: 10.1016/J.MINPRO.2015.06.009 *

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