CN1036283C - 贵金属的回收方法 - Google Patents

贵金属的回收方法 Download PDF

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Publication number
CN1036283C
CN1036283C CN90101201A CN90101201A CN1036283C CN 1036283 C CN1036283 C CN 1036283C CN 90101201 A CN90101201 A CN 90101201A CN 90101201 A CN90101201 A CN 90101201A CN 1036283 C CN1036283 C CN 1036283C
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China
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slurry
gold
charcoal
ore
liquid
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Expired - Fee Related
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CN90101201A
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English (en)
Chinese (zh)
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CN1046942A (zh
Inventor
迪安·罗伯特·巴特勒
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00Obtaining noble metals
    • C22B11/04Obtaining noble metals by wet processes
    • C22B11/042Recovery of noble metals from waste materials
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00Obtaining noble metals
    • C22B11/04Obtaining noble metals by wet processes
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/04Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20Treatment or purification of solutions, e.g. obtained by leaching
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/22Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition
    • C22B3/24Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means, or by thermal decomposition by adsorption on solid substances, e.g. by extraction with solid resins
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/42Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
CN90101201A 1989-03-07 1990-03-07 贵金属的回收方法 Expired - Fee Related CN1036283C (zh)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPJ307989 1989-03-07
AUPJ3079 1989-03-07
AUPJ484089 1989-06-22
AUPJ4840 1989-06-22

Publications (2)

Publication Number Publication Date
CN1046942A CN1046942A (zh) 1990-11-14
CN1036283C true CN1036283C (zh) 1997-10-29

Family

ID=25643643

Family Applications (1)

Application Number Title Priority Date Filing Date
CN90101201A Expired - Fee Related CN1036283C (zh) 1989-03-07 1990-03-07 贵金属的回收方法

Country Status (23)

Country Link
US (1) US5215575A (OSRAM)
CN (1) CN1036283C (OSRAM)
AP (1) AP151A (OSRAM)
AR (1) AR246558A1 (OSRAM)
BR (1) BR9007193A (OSRAM)
CA (1) CA2045551A1 (OSRAM)
CU (1) CU22322A3 (OSRAM)
GB (1) GB2248631B (OSRAM)
GR (1) GR1002301B (OSRAM)
HR (1) HRP920601A2 (OSRAM)
IE (1) IE62041B1 (OSRAM)
IL (1) IL93664A (OSRAM)
IN (1) IN178836B (OSRAM)
MA (1) MA22480A1 (OSRAM)
MY (1) MY105658A (OSRAM)
NZ (1) NZ232793A (OSRAM)
OA (1) OA09217A (OSRAM)
PE (1) PE891A1 (OSRAM)
PH (1) PH27611A (OSRAM)
RU (1) RU2069235C1 (OSRAM)
WO (1) WO1990010721A1 (OSRAM)
YU (1) YU46290A (OSRAM)
ZA (1) ZA901703B (OSRAM)

Families Citing this family (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993018192A1 (en) * 1992-03-09 1993-09-16 Pivot Mining Nl Continuous leaching of treated titaniferous ores with alcohol solutions
US5354359A (en) * 1992-04-01 1994-10-11 Newmont Gold Co. Hydrometallurgical process for the recovery of precious metal values from precious metal ores with thiosulfate lixiviant
US5449396A (en) * 1993-02-16 1995-09-12 Laskorin; Boris N. Method for recovering gold and silver from ore starting materials
CA2147307A1 (en) * 1994-04-20 1995-10-21 Dean Butler Noble metal recovery
USH1661H (en) * 1994-08-30 1997-07-01 The United States Of America As Represented By The Secretary Of The Navy Ion exchange removal of cations under chelating/complexing conditions
US5536297A (en) * 1995-02-10 1996-07-16 Barrick Gold Corporation Gold recovery from refractory carbonaceous ores by pressure oxidation and thiosulfate leaching
US5785736A (en) * 1995-02-10 1998-07-28 Barrick Gold Corporation Gold recovery from refractory carbonaceous ores by pressure oxidation, thiosulfate leaching and resin-in-pulp adsorption
DE19710529A1 (de) * 1997-03-14 1998-09-17 Ruhr Zink Gmbh Verfahren zur Anreicherung von Silber oder anderen Wertmetallen durch Flotation aus einer Suspension, beispielsweise aus den Rückständen der Zinklaugung
GB9804486D0 (en) * 1998-03-02 1998-04-29 Robinson Lee F Extraction of valuable metal
US6251163B1 (en) 1998-03-04 2001-06-26 Placer Dome, Inc. Method for recovering gold from refractory carbonaceous ores
US6368381B1 (en) 1998-03-11 2002-04-09 Placer Dome Technical Services, Ltd. Autoclave using agitator and sparge tube to provide high oxygen transfer rate to metal-containing solutions
US6010869A (en) * 1998-07-23 2000-01-04 The United States Of America As Represented By The Secretary Of The Air Force Method to collect and recover microorganisms from environmental samples
RU2152448C1 (ru) * 1999-01-13 2000-07-10 Институт химии нефти СО РАН Способ извлечения благородных металлов
US6221001B1 (en) 1999-01-26 2001-04-24 Ada Environmental Solutions Llc Fly-ash slurry with solidification retardant
US6267802B1 (en) 1999-06-17 2001-07-31 Ada Environmental Solutions, Llc Composition apparatus and method for flue gas conditioning
US6270555B1 (en) 1999-12-30 2001-08-07 Solvay Minerals, Inc. Process for treating precious metal ores
US6344068B1 (en) 2000-04-04 2002-02-05 Barrick Gold Corporation Process for recovering gold from thiosulfate leach solutions and slurries with ion exchange resin
US6660059B2 (en) * 2000-05-19 2003-12-09 Placer Dome Technical Services Limited Method for thiosulfate leaching of precious metal-containing materials
US6494932B1 (en) * 2000-06-06 2002-12-17 Birch Mountain Resources, Ltd. Recovery of natural nanoclusters and the nanoclusters isolated thereby
GB0025502D0 (en) 2000-10-18 2000-11-29 Johnson Matthey Plc Metal scavenging
US6632264B2 (en) 2001-04-17 2003-10-14 The University Of British Columbia Gold recovery from thiosulfate leaching
RU2214463C1 (ru) * 2002-03-14 2003-10-20 Иркутский государственный технический университет Способ извлечения серебра из цианистых растворов и пульп
US7811594B2 (en) * 2002-03-28 2010-10-12 Beiersdorf Ag Crosslinked oil droplet-based cosmetic or pharmaceutical emulsions
US6797035B2 (en) * 2002-08-30 2004-09-28 Ada Environmental Solutions, Llc Oxidizing additives for control of particulate emissions
US7722840B2 (en) * 2002-11-15 2010-05-25 Placer Dome Technical Services Limited Method for thiosulfate leaching of precious metal-containing materials
US6827837B2 (en) * 2002-11-22 2004-12-07 Robert W. Halliday Method for recovering trace elements from coal
RU2235140C2 (ru) * 2002-12-06 2004-08-27 Горный институт Уральского отделения РАН Способ извлечения благородных металлов
RU2237092C1 (ru) * 2003-02-19 2004-09-27 Институт химии Дальневосточного отделения РАН (статус государственного учреждения) Способ извлечения серебра из флотационных сульфидных концентратов
US20040237721A1 (en) * 2003-05-29 2004-12-02 Morteza Baghalha Anoxic leaching of precious metals with thiosulfate and precious metal oxidants
TW200624151A (en) * 2004-11-12 2006-07-16 Monsanto Technology Llc Recovery of noble metals from aqueous process streams
US7604783B2 (en) 2004-12-22 2009-10-20 Placer Dome Technical Services Limited Reduction of lime consumption when treating refractor gold ores or concentrates
CA2620863A1 (en) * 2005-09-06 2007-03-15 Anglo Platinum Limited Fire assay flux composition for the analysis of pgm and gold containing mineral samples
US8061888B2 (en) 2006-03-17 2011-11-22 Barrick Gold Corporation Autoclave with underflow dividers
US8252254B2 (en) 2006-06-15 2012-08-28 Barrick Gold Corporation Process for reduced alkali consumption in the recovery of silver
RU2351666C1 (ru) * 2007-07-11 2009-04-10 Институт химии Дальневосточного отделения Российской академии наук (статус государственного учреждения) (Институт химии ДВО РАН) Способ извлечения золота и серебра из концентратов
WO2009037596A2 (en) * 2007-09-17 2009-03-26 Barrick Gold Corporation Method to improve recovery of gold from double refractory gold ores
DE102008024590B4 (de) * 2008-05-21 2017-06-01 Heraeus Deutschland GmbH & Co. KG Recycling-Verfahren für Katalysatorformkörper
RU2380434C1 (ru) * 2008-10-03 2010-01-27 Институт химии Дальневосточного отделения Российской академии наук (статус государственного учреждения) (Институт химии ДВО РАН) Способ извлечения золота из золотосодержащего органического сырья
CN101704531B (zh) * 2009-08-25 2011-09-28 中国地质大学(武汉) 一种高纯埃洛石的制备方法
CN101759195B (zh) * 2009-12-10 2011-09-07 云南天鸿高岭矿业有限公司 一种高纯埃洛石的生产工艺
WO2011100821A1 (en) * 2010-02-18 2011-08-25 Neomet Technologies Inc. Process for the recovery of gold from an ore in chloride medium with a nitrogen species
EA032225B1 (ru) 2010-12-07 2019-04-30 Баррик Гольд Корпорейшн Прямоточные и противоточные процессы ионного обмена в выщелачивателе в способах выщелачивания золота
AR086933A1 (es) 2011-06-15 2014-01-29 Barrick Gold Corp Metodo para recuperar metales preciosos y cobre de soluciones de lixiviado
US9528169B2 (en) * 2011-08-03 2016-12-27 The Curators Of The University Of Missouri Method for separation of chemically pure Os from metal mixtures
CA2844519A1 (en) * 2011-08-03 2013-02-07 The Curators Of The University Of Missouri Method for separation of chemically pure os from metal mixtures
WO2014110518A1 (en) 2013-01-14 2014-07-17 Simmons William D Flotation circuit for oxide and sulfide ores
US10161016B2 (en) 2013-05-29 2018-12-25 Barrick Gold Corporation Method for pre-treatment of gold-bearing oxide ores
CA2821467C (en) 2013-07-18 2019-12-24 Nichromet Extraction Inc. Method for gold recovery on particules
AU2015100109A4 (en) * 2014-03-18 2015-03-12 Subhash KADAM Metallurgy of noble metals found from the soil of mangalwedha
US20150329934A1 (en) * 2014-05-15 2015-11-19 Rulon W. Dahl Dahl Process
US10017837B2 (en) * 2014-10-22 2018-07-10 Chevron U.S.A. Inc. Metallurgical extraction technique to recover platinum group metals from a filter cake
CN104445520B (zh) * 2014-12-30 2017-01-04 广州科城环保科技有限公司 一种电镀含氰废液的处理方法
CA2917505C (en) * 2015-01-15 2022-03-22 Mintek Gold recovery from carbon
JP2016176802A (ja) * 2015-03-19 2016-10-06 株式会社クレハ 金属異物の回収方法および重合体の金属異物検査方法
BR112017020592B1 (pt) 2015-04-08 2021-09-21 Ecolab Usa Inc. Métodos para extrair metal de um minério portador de metal e para melhorar a eficiência de lixiviação em um processo de extração de metal, pasta aquosa, e, uso de uma composição de tensoativo e um agente de lixiviação
RU2607285C1 (ru) * 2015-08-17 2017-01-10 Лидия Алексеевна Воропанова Экстракция ионов серебра из солянокислых растворов трибутилфосфатом
CN105547897A (zh) * 2016-01-26 2016-05-04 山东黄金矿业(莱州)有限公司精炼厂 一种氰化金泥中金、银含量的联测方法
WO2019204554A1 (en) * 2018-04-19 2019-10-24 Warner Babcock Institute For Green Chemistry, Llc Methods of rare earth metal recovery from electronic waste
US11767228B2 (en) 2018-05-03 2023-09-26 Arafura Resources Limited Processing rare earth sulphate solutions
PE20211512A1 (es) 2019-01-21 2021-08-11 Barrick Gold Corp Metodo para la lixiviacion con tiosulfato catalizado con carbon de materiales que contienen oro
RU2699142C1 (ru) * 2019-03-27 2019-09-03 Федеральное государственное бюджетное научное учреждение "Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук" (ФИЦ КНЦ СО РАН, КНЦ СО РАН) Способ извлечения серебра из солянокислых растворов
CN112011687A (zh) * 2019-05-31 2020-12-01 王志广 一种新型金银浸出剂及其制备方法
CN112442592A (zh) * 2020-11-09 2021-03-05 桂林正翰科技开发有限责任公司 一种基于离子交换的从氰化贵液中提金的方法
CN113215412B (zh) * 2021-05-10 2022-07-29 上海第二工业大学 一种选择性浸出回收废弃镀银件或含银固体废物表面银的方法
CN113552311A (zh) * 2021-06-17 2021-10-26 江西省地质调查研究院 一种含金矿样金含量的分析方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764650A (en) * 1970-12-31 1973-10-09 Us Interior Recovery of gold from ores
US4188208A (en) * 1978-05-22 1980-02-12 Newmont Exploration Limited Recovery of gold from carbonaceous gold-bearing ores
US4289532A (en) * 1979-12-03 1981-09-15 Freeport Minerals Company Process for the recovery of gold from carbonaceous ores
US4552589A (en) * 1984-01-27 1985-11-12 Getty Oil Company Process for the recovery of gold from refractory ores by pressure oxidation
EP0177294A2 (en) * 1984-09-27 1986-04-09 Sherritt Gordon Limited Recovery of gold from refractory auriferous iron-containing sulphidic material

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB451979A (en) * 1935-05-14 1936-08-14 Merrill Co Improvements in or relating to the recovery of precious metals from ores or preciousmetal bearing deposits
GB851552A (en) * 1958-03-04 1960-10-19 Fairweather Harold G C Process for extracting gold and silver from their ores
BE847441A (fr) * 1976-10-19 1977-02-14 Procede pour recuperer des metaux precieux de matieres en contenant.
CA1188522A (en) * 1982-03-11 1985-06-11 Eberhard Krause Recovery of silver from precious metal-containing intermediates
US4654078A (en) * 1985-07-12 1987-03-31 Perez Ariel E Method for recovery of precious metals from difficult ores with copper-ammonium thiosulfate
PH21188A (en) * 1985-09-10 1987-08-12 Butler Dean Leaching process
DE3801741C1 (OSRAM) * 1988-01-22 1989-06-15 Degussa Ag, 6000 Frankfurt, De

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764650A (en) * 1970-12-31 1973-10-09 Us Interior Recovery of gold from ores
US4188208A (en) * 1978-05-22 1980-02-12 Newmont Exploration Limited Recovery of gold from carbonaceous gold-bearing ores
US4289532A (en) * 1979-12-03 1981-09-15 Freeport Minerals Company Process for the recovery of gold from carbonaceous ores
US4552589A (en) * 1984-01-27 1985-11-12 Getty Oil Company Process for the recovery of gold from refractory ores by pressure oxidation
EP0177294A2 (en) * 1984-09-27 1986-04-09 Sherritt Gordon Limited Recovery of gold from refractory auriferous iron-containing sulphidic material

Also Published As

Publication number Publication date
AP9000167A0 (en) 1990-04-30
US5215575A (en) 1993-06-01
IE62041B1 (en) 1994-12-14
GB9116316D0 (en) 1991-09-11
GR900100161A (el) 1991-07-31
CA2045551A1 (en) 1990-09-20
YU46290A (sh) 1993-11-16
WO1990010721A1 (en) 1990-09-20
CU22322A3 (es) 1995-01-31
RU2069235C1 (ru) 1996-11-20
ZA901703B (en) 1990-12-28
GB2248631B (en) 1993-06-09
OA09217A (fr) 1992-06-30
GB2248631A (en) 1992-04-15
CN1046942A (zh) 1990-11-14
NZ232793A (en) 1991-07-26
IL93664A (en) 1994-11-11
MA22480A1 (fr) 1992-12-31
BR9007193A (pt) 1991-11-26
AR246558A1 (es) 1994-08-31
IE900781L (en) 1990-09-07
HRP920601A2 (en) 1995-06-30
AU5260690A (en) 1990-10-09
IN178836B (OSRAM) 1997-07-05
AU631413B2 (en) 1992-11-26
AP151A (en) 1991-10-02
GR1002301B (el) 1996-05-07
MY105658A (en) 1994-11-30
PE891A1 (es) 1991-02-02
PH27611A (en) 1993-08-31

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