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| Number | Title | Issue Date |
| 7534285 | Method and apparatus for the recovery of refractory mineral ores A method for extraction a metal from a mineral ore including a refractory ore contained in a metal. The method includes concentration of refractory ore followed by micronization of the concentrate until gold is liberated by the extraction solution and mixing of micr... | 05/19/2009 |
| 7285256 | Precious metal recovery using thiocyanate lixiviant Precious metal-containing mineral material is subjected to an acidic thiocyanate leach to dissolve the precious metal as a precious metal-thiocyanate complex. A feed of the thiocyanate leach solution may include a large molar ratio of ferric iron to thiocyanate. Pre... | 10/23/2007 |
| 7156894 | Method for recovering metal values from concentrates of sulfide minerals A method of recovering precious metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from a crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refra... | 01/02/2007 |
| 7125436 | Method for improving metals recovery using high temperature pressure leaching The present invention is directed to a system for recovering metal values from metal-bearing materials. During a reactive process, a seeding agent is introduced to provide a nucleation site for the crystallization and/or growth of solid species which otherwise tend ... | 10/24/2006 |
| 7066983 | Method for thiosulfate leaching of precious metal-containing materials Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polyth... | 06/27/2006 |
| 6652623 | Method and kit for working up a gold bath In a method for working up a gold bath or a gold alloy bath, which contains gold in the form of a gold sulphite complex, working up takes place through at least one oxidant, which oxidizes the sulphite contained in the complex and reduces the gold contain... | 11/25/2003 |
| 6500231 | Recovery of precious metals from thiosulfate solutions In one aspect, the present invention provides a method for recovering precious metal, and particularly gold, from a particulate substrate loaded with a precious metal-containing coating, in which a portion, but less than substantially all, of the particul... | 12/31/2002 |
| 6344068 | Process for recovering gold from thiosulfate leach solutions and slurries with ion exchange resin A process for recovering gold from thiosulfate leach solutions and slurries in which gold is loaded into an ion exchange resin. Gold is recovered from the resin by elution with polythionate ions and the resin is regenerated with sulfide or sulfite. Gold i... | 02/05/2002 |
| 6331200 | Method for preparing gold of high purity A method is proposed for producing gold of high purity from noble metal solutions containing nitrate, with the following steps: a) Nitrate destruction in the noble metal solution, b) Addition of a gold ion reducing acid Fe2+ solution whose H+ ... | 12/18/2001 |
| 5885327 | Process for the recovery of gold Recovery of gold from alkaline cyanide leach solutions using ion exchange adsorbents, comprising (a) contacting the cyanide leach solution containing the gold with an extraction reagent comprised of a solid adsorbent carrying an organic base functionality... | 03/23/1999 |
| 5785736 | Gold recovery from refractory carbonaceous ores by pressure oxidation, thiosulfate leaching and resin-in-pulp adsorption A process for treatment of precious metal ores in which gold is leached from an oxidized ore slurry using a thiosulfate salt lixiviant and copper catalyst. Gold and copper are subsequently loaded onto an ion exchange resin. Copper is recovered from the re... | 07/28/1998 |
| 5683490 | Solution mining of precious metals using aqueous, sulfur-bearing solutions at elevated temperatures Metallic forms of gold and other precious metals can be dissolved and transported (mined) using an aqueous sulfide-bearing leach solution. Maximum sulfur fugacities are achieved in sulfide-bearing solutions under approximately neutral pH and relatively re... | 11/04/1997 |
| 5536297 | Gold recovery from refractory carbonaceous ores by pressure oxidation and thiosulfate leaching A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slur... | 07/16/1996 |
| 5453297 | Process for producing finely divided metals deposited on oxidized metals A process for producing finely divided 20 to 500 angstrom metal particles, metals with oxide coatings or metal oxides using an alkalide or electride in a non-reactive solvent is described. The process produces various forms of the metal depending upon the... | 09/26/1995 |
| 5364453 | Method for recovering gold and other precious metals from carbonaceous ores A method for recovering precious metals from carbonaceous ore comprising leaching the ore with a lixiviant solution and then preg-robbingly concentrating the precious metal-lixiviant complexes in solution on to the native carbonaceous component of the ore... | 11/15/1994 |
| 5338338 | Method for recovering gold and other precious metals from carbonaceous ores A method for recovering precious metals from carbonaceous ore comprising leaching the ore with a lixiviant solution and then preg-robbingly concentrating the precious metal-lixiviant complexes in solution on to the native carbonaceous component of the ore... | 08/16/1994 |
| 5320665 | Metal recovery process from solution with a steel substrate A method for recovering a metal from a metal ore or waste metal-containing material comprises contacting the ore or waste material with an acidic leaching solution effective for leaching and forming a pregnant solution of at least one metal to be recovere... | 06/14/1994 |
| 5240687 | Brine treatment Geothermal brine is passed through a zone containing a packing metal so as to reduce its tendency to deposit iron/silica scale, reduce corrosivity of the brine, and/or remove and recover metals from the brine. The method polishes the geothermal brine by c... | 08/31/1993 |
| 5238662 | Processes for recovering precious metals Disclosed is a process for recovering precious metals using a combination of smelting and an effective utilization of molten salt chlorination. More specifically, disclosed is a process including the steps of (i) contacting, for example, a matte with a ch... | 08/24/1993 |
| 5232490 | Oxidation/reduction process for recovery of precious metals from MnO2 ores, sulfidic ores and carbonaceous materials A process for separating precious metals from an MnO2, sulfidic or carbonaceous refractory ore or refractory feed such as tailings is provided. The process includes the step of leaching a feed with a leach liquor that includes an acid selected ... | 08/03/1993 |
| 5147617 | Process for recovery of gold from gold ores using a complexing pretreatment and sulfurous acid leaching A process for recovering gold from gold-bearing ores includes the steps of forming a slurry of ground ore and treating the ore with an oxidizing and complexing agent such as hydrogen sulfide or a sulfide salt. A chelating agent, SO2, air, and a... | 09/15/1992 |
| 5147618 | Process for recovery of gold from refractory gold ores using sulfurous acid as the leaching agent A process for recovering gold from refractory gold-bearing ores uses sulfurous acid as the leaching agent to form a gold-sulfite complex. The ore is ground, slurried blended with a chelating agent and then subjected to a simultaneous dissolved SO2 | 09/15/1992 |
| 5145656 | Brine treatment Geothermal brine is passed through a zone containing a packing metal so as to reduce its tendency to deposit iron/silica scale, reduce corrosivity of the brine, and/or remove and recover metals from the brine. The method polished the geothermal brine by c... | 09/08/1992 |
| 5145515 | Treatment of brine A method is disclosed for polishing geothermal brines containing iron-rich silica scale and silica particles suspended therein while removing and recovering copper, silver and other precious metals dissolved therein. The method comprises passing brine hav... | 09/08/1992 |
| 5139752 | Method for extraction of gold and silver from ore with a solution containing a halogen, halogenated salt and organic solvent From an ore containing gold and silver, the gold and silver are extracted by a method which comprises pulverizing the ore and bringing the pulverized ore into contact with an elemental halogen, a halogenated salt, and an organic solvent thereby converting... | 08/18/1992 |
| 5114687 | Ammonia extraction of gold and silver from ores and other materials Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia, ammonium salts and one or more oxidants. The process is particularly effective for refractory gold ores including... | 05/19/1992 |
| 5096678 | Method and apparatus for beneficiating ores A method and apparatus for treating mineral-bearing ores and, more particularly, for treating ores containing precious metals, base metals and the like values by providing a means to extract the metal or other values from a particulated ore by classifying... | 03/17/1992 |
| 5085836 | Process for desilvering silver halide processing fluids A method to reduce dissolved silver present in spent, waste, photographic processing fluids containing thiosulfate, is described. This process involves adjusting the pH to a low level prior to the addition of finely ground steel to the solution. With the ... | 02/04/1992 |
| 5082492 | Recovery of precious metals from aqueous media A method is disclosed for polishing geothermal brines containing iron-rich silica scale and silica particles suspended therein while removing and recovering copper, silver and other precious metals dissolved therein. The method comprises passing brine hav... | 01/21/1992 |
| 5078786 | Process for recovering metal values from jarosite solids This invention concerns a process for recovering metal values from jarosite-containing materials by leaching with a calcium chloride solution at a temperature above about the atmospheric boiling point of the solution and under at least the autogenous pres... | 01/07/1992 |
| 5051128 | Elution process for gold-iodine complex from ion-exchange resins A process for eluting gold-iodine complex from an ion-exchange resin, characterized by adding sulfuric acid and sodium nitrite to the gold-iodine complex adsorbed on the resin, and adding sodium sulfite as an eluant. The process is particularly useful for... | 09/24/1991 |
| 5028260 | Recovery of gold from acidic solutions A process for recovery of gold from an impure precious and base metal-bearing acidic chloride or mixed chloride/sulphate solution comprises the steps of contacting the acidic solution with a polymeric acrylic ester adsorbent ion exchange resin to selectiv... | 07/02/1991 |
| 5021088 | Biohydrometallurgical processing of ores, and microorganisms therefor A process for the separation and recovery from an ore of a metal, or metals, particularly strategic and precious metals, notably gold. A carbon-containing, gold-bearing ore, notably a carbonaceous or carbonaceous pyritic ore, is contacted and microbially ... | 06/04/1991 |
| 4992097 | Metal recovery process The invention relates to a process for the recovery of a valuable metal(s) from its ore(s), that includes a method for removal of environmentally hazardous, volatile material prior to the removal of the metal(s) from its ore pulp or liquor carrier. The pr... | 02/12/1991 |
| 4904358 | Gold and silver recovery processes by electrolytic generation of active bromine The invention comprises leaching of ore or other materials containing gold and/or silver with an electrolyzed sodium bromide solution. A quantity of electric current is passed through a volume of 5% to 50% by weight sodium bromide solution to generate a q... | 02/27/1990 |
| 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 A hydrometallurgical process for enrichment of gold, platinum and palladium from copper electrolysis anode sludge, and simultaneously recovery of selenium, in which the sludge is treated with Cl2 /HCl to transform the selenium of a hexavelent s... | 09/13/1988 |
| 4731113 | Method for the recovery of precious metals from ores A process for the recovery of precious metals from ore containing the same is disclosed. The process includes the formation of a lixiviant solution including a thiourea compound, urea and an alkali lignin sulfonate. The ore is then exposed to this lixivia... | 03/15/1988 |
| 4725313 | Method of extracting a precious metal from an ore A method of recovering a precious metal from an ore comprises treating the ore with a cyanide solution and simultaneously treating the ore with mercury to cause amalgamation with the precious mineral.... | 02/16/1988 |
| 4723998 | Recovery of gold from carbonaceous ores by simultaneous chlorine leach and ion exchange resin adsorption process A gold recovery process is disclosed in which the gold content of ores, including carbonaceous ores or mixtures of carbonaceous and oxide ores, is extracted by a simultaneous chlorine leach and ion exchange resin adsorption procedure. The process eliminat... | 02/09/1988 |
| 4670052 | Process for the recovery of gold from a precious metal bearing sludge concentrate A process for the recovery of gold from a precious metal bearing sludge concentrate is disclosed. The process comprises the steps of leaching the sludge with hydrochloric acid and hydrogen peroxide to solubilize at least gold, palladium and platinum, remo... | 06/02/1987 |
