http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-497835-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7e50e630f8b104c342ec406501940f3b |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C25C1-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C25C1-20 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C25C1-20 |
| filingDate | 1937-05-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1938-12-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-497835-A |
| titleOfInvention | A process for the separation of metals or metal compounds |
| abstract | 497,835. Electrolytic recovery of metals from ores. VALE, W. H. May 21, 1937, No. 14234. [A Specification was laid open to inspection under Sect. 91 of the Acts, Nov. 30, 1937.] [Class 31] The ore is immersed free from connection in an electrical circuit in an electrolyte through which a current of voltage approximately 50 or more is passed ; the metal of the ore combines with hydroxyl ions of the electrolyte and passes into solution by virtue of electric charges induced in the ore or the particles thereof. The electrolyte should be of lower conductivity than the ore particles. Direct current is preferred but alternating current may be employed. The metal is recovered from the solution by any suitable means. In an example 7 lb. of an ore containing 17 grains of free gold per ton is introduced in a canvas bag enclosing an anode into a solution containing 0À1 per cent of a commercial mixture of sodium and potassium cyanides and 0À1 per cent of caustic soda, the ore going into suspension on entry of the liquid into the bag. A current of 50 amps and 125 volts is passed. A refractory sulphide ore containing 12 dwts. of gold per ton may be similarly treated, passage of current for a longer period being necessary in this case. In a modified form of treatment the ore is wet milled and fed to one end of a canvas shoot extending through the electrolyte and enclosing the anode, the ore being maintained in suspension by air jets. The metal is recovered from the electrolyte passing from the other end of the shoot. Metal deposited on the cathode is also recovered. In treating an ore in which the main constituents are arsenic sulphide and iron sulphide surrounding gold suphide, an electrolyte containing caustic soda and calcium cyanamide is employed in order that gold may be brought into solution selectively. The Specification as open to inspection under Sect. 91 includes also the following subjectmatter : (i) electrodeposition of nickel from an electrolyte containing 7 oz. /gal. of ammonium chloride and some ammonium hydroxide into which metal is introduced from a nickel plate interposed between the anode and cathode without electrical connection; (ii) electrodeposition of gold from an electrolyte containing 1 oz./gal. caustic soda and 1 oz./gal, sodium or potassium cyanide into which metallic gold is introduced without electrical connection. This subject-matter does not appear in the Specification as accepted. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4510027-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6319391-B1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2269601-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2269601-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2013146477-A1 |
| priorityDate | 1937-05-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 42.