EP1061144A1 - Procédé pour obtenir de l'or de pureté élevée à partir de solutions de nitrates des métaux précieux - Google Patents

Procédé pour obtenir de l'or de pureté élevée à partir de solutions de nitrates des métaux précieux Download PDF

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Publication number
EP1061144A1
EP1061144A1 EP00111133A EP00111133A EP1061144A1 EP 1061144 A1 EP1061144 A1 EP 1061144A1 EP 00111133 A EP00111133 A EP 00111133A EP 00111133 A EP00111133 A EP 00111133A EP 1061144 A1 EP1061144 A1 EP 1061144A1
Authority
EP
European Patent Office
Prior art keywords
solution
gold
nitrate
precious metal
ppm
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
EP00111133A
Other languages
German (de)
English (en)
Other versions
EP1061144B1 (fr
Inventor
Martin Stettner
Horst Dr. Meyer
Matthias Dr. Grehl
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.)
WC Heraus GmbH and Co KG
Original Assignee
WC Heraus 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 WC Heraus GmbH and Co KG filed Critical WC Heraus GmbH and Co KG
Publication of EP1061144A1 publication Critical patent/EP1061144A1/fr
Application granted granted Critical
Publication of EP1061144B1 publication Critical patent/EP1061144B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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

Definitions

  • the invention relates to a method for producing gold of high purity from nitrate-containing Precious metal solutions.
  • a method for producing a gold powder from particles of certain Size and shape revealed which is characterized in that a gold salt solution with a reducing agent, namely 1) hydroquinone or bromine, chlorine or low Alkyl substitution products of hydroquinone or mixtures thereof or 2) oxalic acid, one Alkaline salt of oxalic acid or mixtures thereof or 3) combinations of 1) and 2) in the presence of a protective colloid is reduced at a temperature in the range of 20 to 100 ° C.
  • a reducing agent namely 1) hydroquinone or bromine, chlorine or low Alkyl substitution products of hydroquinone or mixtures thereof or 2) oxalic acid, one Alkaline salt of oxalic acid or mixtures thereof or 3) combinations of 1) and 2) in the presence of a protective colloid is reduced at a temperature in the range of 20 to 100 ° C.
  • the problem that arises is in particular in providing a process for producing high purity gold using just a few steps.
  • the nitrate in the noble metal solution is destroyed in a first step, for example by adding a reducing agent to the heated solution.
  • the gold ions are then reduced to gold by adding an acidic Fe 2+ solution, the concentration of H + of the Fe 2+ solution being at least 4 mol / l.
  • the precious metal solution previously prepared free of nitrates has a concentration of H + ions of at least 4 mol / l.
  • step b that is to say the addition of an acidic Fe 2+ solution to the nitrate-free prepared noble metal solution, is carried out in a potential-controlled manner, since in this way the end of the reduction is relatively easy to recognize and targeted process control is thus possible.
  • nitrate destruction with formic acid or ascorbic acid is carried out because these substances specifically reduce nitrate to NO, but not gold ions.
  • the end of the reduction is announced by a significant drop in potential.
  • the end point is at 560 mV vs. Pt // Ag / AgCl to determine the necessary purity of the gold while at the same time to achieve optimal gold yield.
  • the residual gold content in the mother liquor was 7 ppm or 0.08% of the gold used.
  • the purity of the gold sponge produced meets the 99.99% fine gold criteria according to the Amercian standard.
  • the following were found as impurities by means of GDL analysis: Ag 11 ppm Cu 1 ppm Pt ⁇ 3 ppm Fe 12 ppm Pd 25 ppm Mg ⁇ 2 ppm Rh ⁇ 1 ppm Mn ⁇ 1 ppm Ru ⁇ 1 ppm Ni ⁇ 1 ppm Al ⁇ 1 ppm Pb ⁇ 3 ppm Be ⁇ 1 ppm Sb ⁇ 5 ppm Bi ⁇ 5 ppm Si 15 ppm Ca ⁇ 1 ppm Sn ⁇ 5 ppm Cd ⁇ 5 ppm Te ⁇ 5 ppm Co ⁇ 3 ppm Zn 2 ppm Cr 1 ppm Total: 67 ppm corresponding to> 99.99% gold purity.

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)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
EP00111133A 1999-06-18 2000-05-24 Procédé pour obtenir de l'or de pureté élevée à partir de solutions de nitrates des métaux précieux Expired - Lifetime EP1061144B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19928028A DE19928028C1 (de) 1999-06-18 1999-06-18 Verfahren zur Herstellung von Gold hoher Reinheit
DE19928028 1999-06-18

Publications (2)

Publication Number Publication Date
EP1061144A1 true EP1061144A1 (fr) 2000-12-20
EP1061144B1 EP1061144B1 (fr) 2003-10-29

Family

ID=7911782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00111133A Expired - Lifetime EP1061144B1 (fr) 1999-06-18 2000-05-24 Procédé pour obtenir de l'or de pureté élevée à partir de solutions de nitrates des métaux précieux

Country Status (4)

Country Link
US (1) US6331200B1 (fr)
EP (1) EP1061144B1 (fr)
DE (2) DE19928028C1 (fr)
ZA (1) ZA200003019B (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0073108A1 (fr) * 1981-08-12 1983-03-02 Robert Henry Perrin Procédé de récupération de métaux
JPH05222465A (ja) * 1992-02-10 1993-08-31 Sumitomo Metal Mining Co Ltd パラジウム含有溶液からのＮＯｘ の除去方法
JPH09272927A (ja) * 1996-04-08 1997-10-21 Sumitomo Metal Mining Co Ltd パラジウム含有溶液からＮＯｘの除去方法
RU2120485C1 (ru) * 1997-07-03 1998-10-20 Щелковский завод вторичных драгоценных металлов Способ извлечения платиновых металлов из содержащего их материала

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0073108A1 (fr) * 1981-08-12 1983-03-02 Robert Henry Perrin Procédé de récupération de métaux
JPH05222465A (ja) * 1992-02-10 1993-08-31 Sumitomo Metal Mining Co Ltd パラジウム含有溶液からのＮＯｘ の除去方法
JPH09272927A (ja) * 1996-04-08 1997-10-21 Sumitomo Metal Mining Co Ltd パラジウム含有溶液からＮＯｘの除去方法
RU2120485C1 (ru) * 1997-07-03 1998-10-20 Щелковский завод вторичных драгоценных металлов Способ извлечения платиновых металлов из содержащего их материала

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 199339, Derwent World Patents Index; Class E36, AN 1993-309447, XP002147907 *
DATABASE WPI Section Ch Week 199801, Derwent World Patents Index; Class M25, AN 1998-004405, XP002147909 *
DATABASE WPI Section Ch Week 200012, Derwent World Patents Index; Class M25, AN 2000-135514, XP002147908 *

Also Published As

Publication number Publication date
US6331200B1 (en) 2001-12-18
DE50004219D1 (de) 2003-12-04
EP1061144B1 (fr) 2003-10-29
ZA200003019B (en) 2001-01-09
DE19928028C1 (de) 2000-08-17

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