US532238A - X c carl moldenhatjer - Google Patents
X c carl moldenhatjer Download PDFInfo
- Publication number
- US532238A US532238A US532238DA US532238A US 532238 A US532238 A US 532238A US 532238D A US532238D A US 532238DA US 532238 A US532238 A US 532238A
- Authority
- US
- United States
- Prior art keywords
- gold
- cyanide
- solution
- carl
- ores
- 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.)
- Expired - Lifetime
Links
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 24
- 239000010931 gold Substances 0.000 description 24
- 229910052737 gold Inorganic materials 0.000 description 24
- 239000010970 precious metal Substances 0.000 description 18
- 239000003513 alkali Substances 0.000 description 14
- 239000002253 acid Substances 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 230000001376 precipitating Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 238000001556 precipitation Methods 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000001172 regenerating Effects 0.000 description 4
- XLJMAIOERFSOGZ-UHFFFAOYSA-N 420-05-3 Chemical compound OC#N XLJMAIOERFSOGZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910000497 Amalgam Inorganic materials 0.000 description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L Potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 description 2
- 235000011151 potassium sulphates Nutrition 0.000 description 2
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
- This invention has reference to an improved process of dissolving gold and other precious metals from their ores by means of acid cyanide-solutions, precipitating the gold from said solutions by means of aluminum and regenerating the cyanide-solution so as to enable it to dissolve a new quantity of precious metal out of its ores.
- the gold or other precious metal is dissolved from its ores by means of a cyanide-solution, in which a free acid, such as sulfuric acid for instance, is present in place-of a free alkali.
- a free acid such as sulfuric acid for instance
- Aluminum is then added to the solution, so that the reaction and the precipitation of gold take place in compliance with the fol-
- the free-cyanic acid which is thus obtained besides alumina and potassium sulfate would not be capable of dissolving gold' out of its ores, and it is therefore necessary to add to the solution a free alkali after the precipitation of gold has taken place.
- alkali combines then immediately with the free cyanic acid present in the solution, so as to form a cyanide which is capable of dissolving a new quantity of gold from its ores.
- the cyanide-solution is regenerated, so that it can be used for the next reaction and so on.
- an alkaline earth may be used with the same advantage.
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)
Description
g UNITED STATES PATENT O CARL MOLDENHAUER, OF FRANKFORT-ON-THE-MAIN, GERMANY.
MEIHOD F PRECIPITATING PRECIOUS METALS FROM SOLUTIONS.
SPECIFICATION forming part of Letters Patent No. 532,238, dated January 8, 1 895.
Application filed May 5, 1894; S rial No, 510,147. (No specimens.)
To all whom it may concern.-
Be it known that I, CARL MOLDENHAUER, a subject ofthe Emperor of Germany, residing at Frankfort-on-the-Main, Germany, have invented certain new and useful Improvements ,in Methods of Precipitating Gold or other Precious Metals Out of Their Acid Solutions, of which the following is a specification.
This invention has reference to an improved process of dissolving gold and other precious metals from their ores by means of acid cyanide-solutions, precipitating the gold from said solutions by means of aluminum and regenerating the cyanide-solution so as to enable it to dissolve a new quantity of precious metal out of its ores.
In the Letters Patent No. 512,046 heretofore granted to me on January 2, 1894., I have described a process of precipitating precious metals from their cyanide-solutions by means of aluminum in the presence of afree alkali.
In following up my researches, I have found that aluminum and its alloys or amalgams can be used with the'same advantage for precipitating gold or other precious metals from acid cyanide-solutions, and that the remaining solution can be regenerated by adding, after the precipitation has taken place, a free alkali or an alkaline earth.
In carrying out my improved process, the gold or other precious metal is dissolved from its ores by means of a cyanide-solution, in which a free acid, such as sulfuric acid for instance, is present in place-of a free alkali. Aluminum is then added to the solution, so that the reaction and the precipitation of gold take place in compliance with the fol- The free-cyanic acid, which is thus obtained besides alumina and potassium sulfate would not be capable of dissolving gold' out of its ores, and it is therefore necessary to add to the solution a free alkali after the precipitation of gold has taken place. alkali combines then immediately with the free cyanic acid present in the solution, so as to form a cyanide which is capable of dissolving a new quantity of gold from its ores. In other words, the cyanide-solution is regenerated, so that it can be used for the next reaction and so on. In place of a free alkali, an alkaline earth may be used with the same advantage.
Having thus described my invention, I claim as new and desire to secure by Letters Patent The process herein'described of dissolving gold and other precious metals from the ores by means of cyanide-solutions, which con sists in subjecting the ores to the action of an acid cyanide-solution so as to dissolve the gold or other precious metal, then adding aluminum so as to precipitate the gold or other metal from the solution, and regenerating the cyanide-solution by means of a free alkali or alkaline earth, substantially as set forth. 1
In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribing witnesses.
CARL MOLDENHAUER.
Witnesses:
ALvEsTo S. HOGUE, JEAN GRUND.
This-
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US532238A true US532238A (en) | 1895-01-08 |
Family
ID=2601010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US532238D Expired - Lifetime US532238A (en) | X c carl moldenhatjer |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US532238A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4384889A (en) * | 1981-04-15 | 1983-05-24 | Freeport Research & Development Company | Simultaneous leaching and cementation of precious metals |
-
0
- US US532238D patent/US532238A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4384889A (en) * | 1981-04-15 | 1983-05-24 | Freeport Research & Development Company | Simultaneous leaching and cementation of precious metals |
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