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| Number | Title | Issue Date |
| 7166145 | Recovery of precious metals This invention relates to the recovery of precious metals and, more particularly, to the recovery of precious metals, such as platinum group metals, gold and rhenium, from various sources using a solution comprising at least one ammonium salt, at least one halogen s... | 01/23/2007 |
| 7067090 | Recovery of platinum group metals This invention relates to the recovery of platinum group metals and, more particularly, to the recovery of platinum group metals from various sources by roasting the source material with one or more of sulfuric acid, a sulfate and/or a bi-sulfate and with one or mor... | 06/27/2006 |
| 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 |
| 6203925 | Porous metal and method of preparation thereof A method of preparing a porous metal comprises reducing a mixture comprising (I) a source of metal; (II) a solvent such as water; and (III) a structure-directing agent such as octaethylene glycol monododecyl ether to form a liquid crystalline phase in the... | 03/20/2001 |
| 5769925 | Process for the elution of precious metals absorbed on active carbon A powerful reducing agent such as hydrazine monohydrate is added to the standard eluent solutions such as NsOH-NaCN with or without alcohol. The kinetics of elution of gold or of silver are thus markedly enhanced.... | 06/23/1998 |
| 5542957 | Recovery of platinum group metals and rhenium from materials using halogen reagents Platinum group metals and rhenium are extracted from their elemental state, complex ores, and other materials such as catalysts by leaching them with a solution containing ammonium halogen salts--iodide and bromide in the presence oxygen and/or sulfuric a... | 08/06/1996 |
| 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 |
| 5358699 | Precious metal recovery process from carbonaceous ores A process for recovering at least one precious metal from an ore containing carbonaceous material is disclosed. The process involves the use of certain plant derived ortho-quinone containing components, in particular, certain lignin and/or tannin derived ... | 10/25/1994 |
| 5344625 | Precious metal recovery process from sulfide ores A process for recovering at least one precious metal from an ore containing metal sulfide material is disclosed. The process involves the use of promoting amounts of certain plant derived ortho-quinone containing components, in particular, certain lignin ... | 09/06/1994 |
| 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 |
| 5262136 | Recovery of gold and silver from complex refractory sulphide ores by cyanidisation and oxidation with peroxides A method of recovering precious metals from a silver bearing ore containing polybasite, pearcite, pyrargyrite, tetrahedrite or argentite by mixing the ore with an alkali metal or alkaline earth metal peroxide in slurry or solid, leaching the ore with a cy... | 11/16/1993 |
| 5256188 | Process for the separation of rhodium from organic solutions A process for the separation of rhodium from rhodium containing organic solutions, organic-aqueous mixtures or aqueous solutions containing complexing agents is disclosed. Metallic bismuth, bismuth oxide, bismuth hydroxide or another reducible bismuth com... | 10/26/1993 |
| 5254153 | Cyanide recycling process A process for recycling hydrogen cyanide from a cyanide-containing slurry is provided. The process includes the steps of adjusting the pH of a cyanide-containing slurry, volatilizing HCN contained in the pH adjusted slurry and contacting the volatilized H... | 10/19/1993 |
| 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 |
| 5160711 | Cyanide leaching method for recovering platinum group metals from a catalytic converter catalyst A method for recovering platinum group metals from a catalyst material comprises leaching the material with a cyanide solution at a temperature greater than about 100° C. to form soluble platinum group metal-cyanide complexes in solution. Solids are remo... | 11/03/1992 |
| 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 |
| 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 |
| 4906293 | Hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules An improved hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules. The process includes the steps of contacting the ferromanganese nodules in an extraction zone with an aqueous solution containing effective amounts of ch... | 03/06/1990 |
| 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 |
| 4765827 | Metal value recovery A process for at least one of (1) recovering at least one first metal other than manganese from a first ore containing reducible manganese, and (2) recovering at least one second metal from a second ore containing the second metal and at least one metal s... | 08/23/1988 |
| 4687514 | Process for the recovery of noble metals from solutions There is described a process for the recovery of noble metals from dilute aqueous or non-aqueous solution which contain salts of non-noble metals and/or difficulty volatile inorganic or organic compounds, which is generally usable, simple to carry out and... | 08/18/1987 |
| 4655829 | Metal recovery process Metal values are separated from arsenic sulfide ores in a hydrometallurgical oxidation process using a balanced reactant slurry. The molar concentration of As and Sb in the reactant slurry is controlled with respect to the molar concentration of Cu, Pb, a... | 04/07/1987 |
| 4537628 | Recovery of precious metals The extent of recovery of precious metals, preferably gold and silver, from precious metal ores, concentrates, tailings and wastes which are also sulphide- and arsenic- and/or antimony-bearing, is enhanced by treatment with Caro's acid (H2 SO | 08/27/1985 |
| 4374097 | Method for recovering precious metals Method for extracting precious metals from their ores in which the ore is particulated and mixed with a binding agent to form a paste. The paste material is discharged into a rotary drum at an extruding station where it is pelletized by forcing it through... | 02/15/1983 |
| 4369061 | Recovery of precious metals from difficult ores Precious metals such as gold and silver are recovered from difficult-to-treat ores, particularly those containing manganese, by lixiviating using an ammonium thiosulfate leach solution containing copper, sufficient ammonia to maintain a pH of at least 7.0... | 01/18/1983 |
| 4342592 | Non-polluting process for recovery of precious metal values from ores including those containing carbonate materials A non-polluting chemical process for recovery of metals from metal containing ores or other solid materials by: (1) Treating the ore with a large volume of an aqueous solution containing chloride and hypochlorite ions (lixiviant solution); (2) Recovering the s... | 08/03/1982 |
| 4288304 | Hydrometallurgical process for treatment of sulphur ores The invention provides a process for extracting zinc from a sulphur- and zinc-containing ore which involves (a) leaching the sulphur ore or concentrate with an aqueous solution of cupric chloride, which can be regenerated by means of a regenerating agent ... | 09/08/1981 |
| 4092154 | Aluminum containing precipitating agent for precious metals and method for its use A precipitating agent for precipitating precious metals such as gold from aqueous cyanide solution of the precious metal ions includes aluminum powder and a reducing agent such as sodium hydrosulfite, sodium borohydride or hydrazine. The precipitating age... | 05/30/1978 |
| 4082546 | Recovery of waste heavy metals from solutions by cementation with aluminum A method is provided for recovering precious metals such as gold, palladium, rhodium and platinum as well as copper and zinc from respective waste solutions laden with such metals, such as stop baths, stabilizers, solution tailings, and waste plating drag... | 04/04/1978 |
| 4077800 | Method for the recovery of platinum from spent catalysts An economical procedure for the recovery of platinum from a spent catalyst involves subjecting the catalyst to fluorination with elementary fluorine or a mixture thereof with hydrogen fluoride at a temperature ranging from 100°-600° C. The resultant pla... | 03/07/1978 |
| 4060410 | Process for removing heavy metals from fluid media A process in which metal foil is introduced into a fluid containing one or more heavy metals, so that one part of the surface of the foil is in contact with the fluid and another part thereof is in contact with air and that an activator in the form of a s... | 11/29/1977 |
| 4012481 | Process for the separation of platinum group metals Disclosed herein is a process for the separation and recovery of Rhodium values from aqueous mineral acid solutions also containing Iridium and/or Ruthenium which comprises contacting the metal bearing aqueous solution with a water immiscible organic solv... | 03/15/1977 |
