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Class Information
Number: 75/736
Name: Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures > Processes > Producing or treating free metal > Below 300 degrees c > Using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.) > Displacing by another metal (i.e., electromotive series) > Noble metal recovered as free metal > Gold(au) recovered as free metal
Description: Process wherein the free metal recovered by displacement is Gold (Au).










Sub-classes under this class:

Class Number Class Name Patents
75/737 From cyanide solution 31


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8597399 Method for thiosulfate leaching of precious metal-containing materials Dec. 3, 2013
8585991 Method for recovering indium, silver, gold and rare, precious and base metals from complex oxide and sulfide ores Nov. 19, 2013
8029751 Reduction of lime consumption when treating refractory gold ores or concentrates Oct. 4, 2011
7682420 Method for leaching gold Mar. 23, 2010
7572317 Thiosulfate generation in situ in precious metal recovery Aug. 11, 2009
7534285 Method and apparatus for the recovery of refractory mineral ores May. 19, 2009
7156894 Method for recovering metal values from concentrates of sulfide minerals Jan. 2, 2007
7125436 Method for improving metals recovery using high temperature pressure leaching Oct. 24, 2006
6652623 Method and kit for working up a gold bath Nov. 25, 2003
6500231 Recovery of precious metals from thiosulfate solutions Dec. 31, 2002
6344068 Process for recovering gold from thiosulfate leach solutions and slurries with ion exchange resin Feb. 5, 2002
6331200 Method for preparing gold of high purity Dec. 18, 2001
5885327 Process for the recovery of gold Mar. 23, 1999
5785736 Gold recovery from refractory carbonaceous ores by pressure oxidation, thiosulfate leaching and resin-in-pulp adsorption Jul. 28, 1998
5683490 Solution mining of precious metals using aqueous, sulfur-bearing solutions at elevated temperatures Nov. 4, 1997
5536297 Gold recovery from refractory carbonaceous ores by pressure oxidation and thiosulfate leaching Jul. 16, 1996
5453297 Process for producing finely divided metals deposited on oxidized metals Sep. 26, 1995
5364453 Method for recovering gold and other precious metals from carbonaceous ores Nov. 15, 1994
5338338 Method for recovering gold and other precious metals from carbonaceous ores Aug. 16, 1994
5320665 Metal recovery process from solution with a steel substrate Jun. 14, 1994
5240687 Brine treatment Aug. 31, 1993
5238662 Processes for recovering precious metals Aug. 24, 1993
5232490 Oxidation/reduction process for recovery of precious metals from MnO.sub.2 ores, sulfidic ores and carbonaceous materials Aug. 3, 1993
5147617 Process for recovery of gold from gold ores using a complexing pretreatment and sulfurous acid leaching Sep. 15, 1992
5147618 Process for recovery of gold from refractory gold ores using sulfurous acid as the leaching agent Sep. 15, 1992
5145515 Treatment of brine Sep. 8, 1992
5145656 Brine treatment Sep. 8, 1992
5139752 Method for extraction of gold and silver from ore with a solution containing a halogen, halogenated salt and organic solvent Aug. 18, 1992
5114687 Ammonia extraction of gold and silver from ores and other materials May. 19, 1992
5096678 Method and apparatus for beneficiating ores Mar. 17, 1992
5085836 Process for desilvering silver halide processing fluids Feb. 4, 1992
5082492 Recovery of precious metals from aqueous media Jan. 21, 1992
5078786 Process for recovering metal values from jarosite solids Jan. 7, 1992
5051128 Elution process for gold-iodine complex from ion-exchange resins Sep. 24, 1991
5028260 Recovery of gold from acidic solutions Jul. 2, 1991
5021088 Biohydrometallurgical processing of ores, and microorganisms therefor Jun. 4, 1991
4992097 Metal recovery process Feb. 12, 1991
4904358 Gold and silver recovery processes by electrolytic generation of active bromine Feb. 27, 1990
4770700 Hydrometallurgical process for the separation and enrichment of gold, platinum, and palladium, together with recovery of selenium from the anode sludge of copper electrolysis Sep. 13, 1988
4731113 Method for the recovery of precious metals from ores Mar. 15, 1988
4725313 Method of extracting a precious metal from an ore Feb. 16, 1988
4723998 Recovery of gold from carbonaceous ores by simultaneous chlorine leach and ion exchange resin adsorption process Feb. 9, 1988
4670052 Process for the recovery of gold from a precious metal bearing sludge concentrate Jun. 2, 1987
4662938 Recovery of silver and gold May. 5, 1987
4655829 Metal recovery process Apr. 7, 1987
4654078 Method for recovery of precious metals from difficult ores with copper-ammonium thiosulfate Mar. 31, 1987
4632701 Process for the recovery of silver from a residue essentially free of elemental sulphur Dec. 30, 1986
4561947 Process for the recovery of noble metals from ores; which process uses thiourea Dec. 31, 1985
4551213 Recovery of gold Nov. 5, 1985
4384889 Simultaneous leaching and cementation of precious metals May. 24, 1983

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