EP1061144A1 - Verfahren zur Herstellung von Gold hoher Reinheit aus nitrathaltigen Edelmetall-Lösungen - Google Patents
Verfahren zur Herstellung von Gold hoher Reinheit aus nitrathaltigen Edelmetall-Lösungen Download PDFInfo
- 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
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)
Abstract
Description
- Goldlösung in Königswasser
c(Au) = 33,508 g/l, c(Pd) = 9,861 g/l, c(Pt) = 10,612 g/l - Eisen(II)sulfat, techn. FeSO4 . 7 H20 in 10 n HCl gelöst
- Salzsäure, techn., 10 n
- Ameisensäure, techn., 85 %
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 | ||
Summe: 67 ppm entsprechend > 99,99 % Goldreinheit. |
Claims (5)
- Verfahren zur Herstellung von Gold hoher Reinheit aus nitrathaltigen Edelmetall-Lösungen mit folgenden Schritten:a) Nitratzerstörung in der Edelmetall-Lösung,b) eine Gold-Ionen-reduzierende Zugabe einer sauren Fe2+-Lösung, deren Konzentration an H+-Ionen mindestens 4 mol/l beträgt,
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Reduktion des Schrittes b) potentialgesteuert durchgeführt wird.
- Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Nitratzerstörung mit Ameisensäure oder Ascorbinsäure durchgeführt wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Nitratzerstörung bei einer Temperatur von T = + 80 bis + 90 °C durchgeführt wird.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die in Schritt a) aufbereitete Lösung vor Zugabe der Fe2+-Ionen-Lösung auf eine Temperatur von T = + 60 °C aufgeheizt wird.
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 (de) | 2000-12-20 |
EP1061144B1 EP1061144B1 (de) | 2003-10-29 |
Family
ID=7911782
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00111133A Expired - Lifetime EP1061144B1 (de) | 1999-06-18 | 2000-05-24 | Verfahren zur Herstellung von Gold hoher Reinheit aus nitrathaltigen Edelmetall-Lösungen |
Country Status (4)
Country | Link |
---|---|
US (1) | US6331200B1 (de) |
EP (1) | EP1061144B1 (de) |
DE (2) | DE19928028C1 (de) |
ZA (1) | ZA200003019B (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0073108A1 (de) * | 1981-08-12 | 1983-03-02 | Robert Henry Perrin | Metallgewinnungsverfahren |
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 |
-
1999
- 1999-06-18 DE DE19928028A patent/DE19928028C1/de not_active Expired - Fee Related
-
2000
- 2000-05-24 EP EP00111133A patent/EP1061144B1/de not_active Expired - Lifetime
- 2000-05-24 DE DE50004219T patent/DE50004219D1/de not_active Expired - Lifetime
- 2000-06-15 ZA ZA200003019A patent/ZA200003019B/xx unknown
- 2000-06-16 US US09/595,123 patent/US6331200B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0073108A1 (de) * | 1981-08-12 | 1983-03-02 | Robert Henry Perrin | Metallgewinnungsverfahren |
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)
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 (de) | 2003-10-29 |
ZA200003019B (en) | 2001-01-09 |
DE19928028C1 (de) | 2000-08-17 |
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