EP0512247A2 - Procédé pour le lixiviation d'or et d'argent - Google Patents

Procédé pour le lixiviation d'or et d'argent Download PDF

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Publication number
EP0512247A2
EP0512247A2 EP92105566A EP92105566A EP0512247A2 EP 0512247 A2 EP0512247 A2 EP 0512247A2 EP 92105566 A EP92105566 A EP 92105566A EP 92105566 A EP92105566 A EP 92105566A EP 0512247 A2 EP0512247 A2 EP 0512247A2
Authority
EP
European Patent Office
Prior art keywords
leaching
peroxoborate
leached
cyanide
mill
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.)
Granted
Application number
EP92105566A
Other languages
German (de)
English (en)
Other versions
EP0512247A3 (en
EP0512247B1 (fr
Inventor
Jürgen Dr. Lorösch
Annette Ziegler
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6430935&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0512247(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Degussa GmbH filed Critical Degussa GmbH
Publication of EP0512247A2 publication Critical patent/EP0512247A2/fr
Publication of EP0512247A3 publication Critical patent/EP0512247A3/de
Application granted granted Critical
Publication of EP0512247B1 publication Critical patent/EP0512247B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C22B11/08—Obtaining noble metals by cyaniding

Definitions

  • the invention relates to a method for leaching gold and silver from ores, ore concentrates and mining material from previous incomplete leachings by grinding the material to be leached in the presence of a cyanide leaching solution which has a pH of 8 to 13 and contains a peroxo compound.
  • heap leaching the ore that has been broken down to 10 to 50 mm is piled up and sprinkled with an aqueous cyanide solution;
  • aqueous cyanide solution usually atmospheric oxygen is used as the oxidizing agent, but peroxo compounds can also be added to the ore heap or the leaching solution - DE-PS 38 30 703, DE-patent application P 40 17 899.4, GB-A 2219474.
  • stirring leaching finely ground ore is leached in tanks or other containers.
  • the gold yield rate is higher here than in the case of heap leaching, but the process costs are also significantly higher.
  • the stirring leaching requires an average grinding of the ore to be leached to less than 100 ⁇ m; Usually a degree of grinding is required, according to which at least 80% of the ground material is smaller than 45 ⁇ m.
  • Known discontinuously and continuously operating wet mills are used to grind the ore.
  • the grinding takes place in one, but mostly in two or more stages, the oversize being recycled in each case.
  • the resulting slurry from the ground ore and generally water is mixed with cyanide and possibly other leaching chemicals and then fed to the leaching tanks.
  • the leaching time for fumigation with air is usually 15 to 30 hours, but it could be significantly shortened by using peroxo compounds, such as hydrogen peroxide, calcium peroxide or peroxoborates, instead of or in addition to air fumigation - DE-PS 36 37 082, DE- PS 38 30 703, DE patent application P 40 17 899.4.
  • peroxo compounds such as hydrogen peroxide, calcium peroxide or peroxoborates
  • the object of the invention is to improve the "cyanidation-in-mill" technique in such a way that an even higher gold yield can be achieved compared to the use of hydrogen peroxide. It should be possible not only to further shorten the total leaching time - time required for grinding and the subsequent stirring leaching - with a high gold yield, but also, if possible, to do without the stirring leaching.
  • the object is achieved by a process for the leaching of gold and silver from ores, ore concentrates and mining material by grinding the material to be leached in the presence of a cyanide leaching solution which has a pH of 8 to 13 and contains a peroxo compound, characterized in that at least one peroxoborate compound is present as the peroxo compound.
  • an effective amount of peroxoborate is present in dissolved and / or finely divided form.
  • the total amount of peroxoborate required can be present in the mill at the start of the leaching, or the peroxoborate is added in one or more portions during the leaching, for example before each grinding stage of a multi-stage grinding process, or is formed in situ from an added borate and hydrogen peroxide .
  • the addition of a peroxoborate is preferred over the in situ formation in the leach slurry.
  • the peroxoborate can be added in powder form, as an aqueous solution or suspension to the material to be leached, the cyanide leaching solution or the leaching slurry.
  • peroxoborate which strongly depends on the material to be leached, can easily be determined on the basis of preliminary experiments. Per t of the material to be leached, 1 to 100 equivalents of peroxoborate, calculated as BO3-, will generally be sufficient. The requirement is preferably between 10 and 60 equivalents of peroxoborate.
  • active oxygen compound peroxoborates or the hydrogen peroxide formed by hydrolysis split off oxygen; oxygen, hydrogen peroxide and peroxoborate can act as oxidizing agents in the leaching process.
  • Peroxoborates including their hydrates, are those of the alkali and alkaline earth metals, but in principle also peroxoborates of other metals, such as, for. B. Zinc.
  • the commercially available peroxoborates namely the so-called sodium perborate mono- and tetrahydrate and calcium perborate, can be used particularly advantageously.
  • So-called superoxidized peroxoborates such as are known from DE-OS 28 11 554 and DE-OS 35 05 158, can also be used.
  • the leaching in the mill is carried out at a pH of 8 to 13, preferably 9 to 12.
  • the pH is adjusted in a manner known per se using alkalis, such as, in particular, lime milk and sodium hydroxide solution. During the grinding process, it may be advisable to adjust the pH to values recognized as optimal.
  • the cyanide content, calculated as CN, in the leaching solution will usually be between 0.005 and 2.5% by weight. Cyanide contents between 0.02 and 0.2% by weight are preferred. Cyanide is used as an alkali cyanide, in particular sodium cyanide, or as calcium cyanide, for example in the form of the so-called "black cyanide".
  • the cyanide can be added in solid or dissolved form to an aqueous slurry containing the material to be leached, or a cyanide-containing leaching solution is used directly to prepare the leaching slurry.
  • Known wet grinding units are suitable for leaching according to the invention; Ball mills and bar mills are preferred.
  • the grinding time depends on the material to be leached and the desired degree of extraction. It is usually milled between 15 minutes and 2 hours.
  • the solids concentration of the leach sludge during grinding can vary over a wide range, usually between 25 and 60% by weight.
  • the degree of grinding is in the range that is customary for stirring leaching.
  • the leaching sludge can, if necessary, be subjected to a stirring leaching or pressure leaching in order to further increase the degree of extraction. Otherwise, the precious metal cyanocomplexes present in solution in the leaching slurry are used for further precious metal extraction by known process stages - the carbon-in-pulp (CIP) and resin-in-pulp (RIP) process and the Merrill-Crowe process separated.
  • CIP carbon-in-pulp
  • RIP resin-in-pulp
  • peroxoborate is all the more surprising given that other peroxo compounds, including calcium peroxide, sodium percarbonate and ammonium peroxodisulfate, have been found to be less effective in terms of gold yield than hydrogen peroxide.
  • the leaching tests using the "cyanidation-in-mill” technique were carried out in a rod mill made of stainless steel with a total volume of 4.5 l. 12 stainless steel rods (18.2 cm long, 2.5 cm diameter) were used as grinding media, thus filling 24% of the mill volume.
  • the grindings were each carried out with 400 g of ore and 600 g of water (40% solids). The volume of the resulting ore slurry fills a further 16% of the mill, so that the total filling of the mill is 40%.
  • the various oxidizing agents and the lime were added to the mill at the beginning of the grinding.
  • the gold yield - leached gold, based on the total Au content of the ore -, the O2 content (ppm) in the leaching solution - determined using an O2 electrode - and the cyanide consumption (kg / t ore) - Cyanide used minus residual cyanide - determined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Chemically Coating (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Switches (AREA)
EP92105566A 1991-05-03 1992-04-01 Procédé pour le lixiviation d'or et d'argent Expired - Lifetime EP0512247B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4114514 1991-05-03
DE4114514A DE4114514A1 (de) 1991-05-03 1991-05-03 Verfahren zur laugung von gold und silber

Publications (3)

Publication Number Publication Date
EP0512247A2 true EP0512247A2 (fr) 1992-11-11
EP0512247A3 EP0512247A3 (en) 1993-05-05
EP0512247B1 EP0512247B1 (fr) 1996-02-28

Family

ID=6430935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92105566A Expired - Lifetime EP0512247B1 (fr) 1991-05-03 1992-04-01 Procédé pour le lixiviation d'or et d'argent

Country Status (9)

Country Link
EP (1) EP0512247B1 (fr)
AT (1) ATE134712T1 (fr)
AU (1) AU642087B2 (fr)
BR (1) BR9201586A (fr)
CA (1) CA2067841A1 (fr)
DE (2) DE4114514A1 (fr)
ES (1) ES2084203T3 (fr)
ZA (1) ZA923190B (fr)
ZW (1) ZW4892A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19829274C2 (de) * 1998-07-01 2002-06-20 Otb Oberflaechentechnik Berlin Verfahren zur Rückgewinnung von Edelmetallen
DE102020209885A1 (de) 2020-08-05 2022-02-10 Robert Bosch Gesellschaft mit beschränkter Haftung Kugelmühle und Verfahren zur Gewinnung von Gold und/oder Silber und/oder mindestens einem Platinmetall
DE102020209884A1 (de) 2020-08-05 2022-02-10 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zur Gewinnung von Gold
DE102020209880A1 (de) 2020-08-05 2022-02-10 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zur Gewinnung von mindestens einem Edelmetall

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU587850B2 (en) * 1985-08-26 1989-08-31 Bendigo Gold Associates Pty. Ltd. A method of pre-treating an ore with hot alkali to improve the recovery of metal valves
DE4017899C1 (en) * 1990-06-02 1991-11-14 Degussa Ag, 6000 Frankfurt, De Extn. of silver and gold from ores - by contacting ore with aq. leaching soln. contg. cyanide in presence of peroxo:borate, and sepg. cyano complexes formed

Also Published As

Publication number Publication date
AU642087B2 (en) 1993-10-07
DE59205427D1 (de) 1996-04-04
ZA923190B (en) 1993-01-27
ES2084203T3 (es) 1996-05-01
CA2067841A1 (fr) 1992-11-04
ZW4892A1 (en) 1993-02-17
ATE134712T1 (de) 1996-03-15
DE4114514A1 (de) 1992-11-05
EP0512247A3 (en) 1993-05-05
BR9201586A (pt) 1992-12-15
EP0512247B1 (fr) 1996-02-28
AU1596092A (en) 1992-11-05

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