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| Number | Title | Issue Date |
| 7147845 | Antimicrobial silver ion complex resinates The present invention relates to novel antimicrobial silver ion complex resinates. More particularly, the present invention contemplates silver ion complex resinate compositions comprising a silver-thiosulfate ion complex loaded onto an organic anion exchange resin.... | 12/12/2006 |
| 6156186 | Method for removing contaminants from process streams in metal recovery processes The present invention is directed to a process for removing various contaminants (e.g., organic collectors, contaminant metals or spectator ions, and/or suspended and colloidal solids) from process streams in leaching processes. The contaminant removal is... | 12/05/2000 |
| 6126720 | Method for smelting noble metal A method for refining noble metals has a silver treating process including a nitric acid leaching step of silver, a purification step of the leaching solution, an electrolytic decomposition step of silver, and a recycling step after the electrolytic decom... | 10/03/2000 |
| 5482694 | Regeneration of cyanide by oxidation of thiocyanate Provided is a method for regenerating cyanide from thiocyanate. The method comprises contacting the thiocyanate with an oxidizing gas containing ozone, generally a mixture of oxygen and ozone. The pH of the contacting medium is generally less than 7.0 to ... | 01/09/1996 |
| 5320720 | Extraction of precious metals from ores thereof Increased efficiency of extraction of silver and gold from ore materials thereof containing active carbonaceous material is obtained by conducting the extraction in two stages. In a first stage a portion of the silver and of the gold when present is extra... | 06/14/1994 |
| 5188713 | Process for recovery of metal A process for recovery of metal from a feedstock comprising copper is provided. The process comprises the steps of: (a) contacting the feedstock with an aqueous mixture comprising ammonium nitrate having a concentration greater than about 1.5M and sulphuric ac... | 02/23/1993 |
| 5169503 | Process for extracting metal values from ores Metal values are solubilized from ore by a lixiviant having a pH from 5 to 8, comprising an aqueous solution of a chloride salt and a hypochlorite salt. Cyanuric acid may be added to retard decomposition of the lixiviant. In one alternative embodiment, an... | 12/08/1992 |
| 4980134 | Leaching process Noble metals, particularly gold, are recovered from ores by a leaching process in which a slurry of ground ore containing an oxidant and a lixiviant for dissolving the noble metal is subjected to an alternating electric field which accelerates and promote... | 12/25/1990 |
| 4828661 | Process for recovery of metals from metal/plastic waste The invention relates to a process for recovery of metals from metal/plastic waste using used etching and washing solutions from the electronics industry, with the following process steps: (a) heating of the metal/plastic waste in a heating bath in order to ... | 05/09/1989 |
| 4744825 | Removal and recovery of silver from waste stream In accordance with the invention, an improved process is provided for the efficient removal and recovery of silver from an impure solution containing silver ions which comprises contacting the silver-containing solution with an activated alumina adsorbent... | 05/17/1988 |
| 4687559 | Treatment of residues for metal recovery This invention relates to a hydrometallurgical process for recovering the values contained in metallurgical residues, such as anode mud. In the first step of the process the residue is leached with an alkali carbonate bearing cyanide solution in the prese... | 08/18/1987 |
| 4637865 | Process for metal recovery and compositions useful therein A process for extracting a precious metal or base metal from a source material containing the metal. The process comprises contacting the source material with an aqueous leaching solution containing a leaching agent comprising an N-halohydantoin compound,... | 01/20/1987 |
| 4619744 | Recovery of heavy metals from aqueous solutions Process for the recovery of heavy metals from aqueous solution by reaction with soluble, functionally-substituted polymer upon which the heavy metal loads, and optionally crosslinks by interaction with the heavy metals present in solution. Metals includin... | 10/28/1986 |
| 4578163 | Gold recovery process A process for treating refractory ores combines pressure oxidation treatment of the ore with cyanidation and carbon-in-pulp recovery. Pressure oxidation is carried out under acidic conditions, at elevated temperatures and pressure. Before cyanidation, the... | 03/25/1986 |
| 4561947 | Process for the recovery of noble metals from ores; which process uses thiourea The present invention provides a process for the hydrometallurgical recovery of noble metals from materials containing them by treatment with thiourea in an aqueous, acidic medium in the presence of an oxidation agent, wherein the aqueous medium simultane... | 12/31/1985 |
| 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 |
| 4427571 | Composition for stripping gold or silver from particulate materials The disclosure relates to desorption of gold or silver from particulate materials and in particular to a composition for use in separating gold or silver from particulate material on which it is adsorbed, which comprises a homogeneous phase mixture of aqu... | 01/24/1984 |
| 4299676 | Recovery of silver from photographic film A process is provided for recovering silver and plastics material from photographic film. For exposed film, film is shredded or chopped, subjected to bleach treatment, washed, and subjected to fixing treatment, the fixing solution being circulated in clos... | 11/10/1981 |
| 4289532 | Process for the recovery of gold from carbonaceous ores The recovery of gold from refractory carbonaceous gold-containing ores by cyanidation techniques is improved by subjecting an oxidized slurry of this type of ores to simultaneous cyanidation and countercurrent granular activated carbon adsorption in two o... | 09/15/1981 |
| 4268307 | Method of extraction of metals from low grade ores A continuous process for recovery of metals, especially precious metals, from various ores, involves pulverizing the ore to a particle size less than five microns, forming a colloidal suspension of the particles in a liquid, extracting metal from the slur... | 05/19/1981 |
| 4229270 | Process for the recovery of metal values from anode slimes A process for treating anode slimes containing silver in which the silver is converted to a form soluble in dilute nitric acid, and in which after dissolution in dilute nitric acid, the silver is electrowon from solution. The process can be carried out by... | 10/21/1980 |
| 4188208 | Recovery of gold from carbonaceous gold-bearing ores When certain sedimentary gold ores containing indigenous organic carbonaceous materials are slurried with an aqueous solution containing an alkali metal cyanide, the aurocyanide complex which is formed is adsorbed by an adsorptive carbon component of the ... | 02/12/1980 |
| 4177068 | Extraction of gold and silver A process for the extraction of gold and silver from their ores in which the ore is reduced to a particle size of 1 mm or less and mixed with a lixiviant, e.g., alkaline sodium or potassium cyanide, in an amount to provide a liquor content of about 8 to 1... | 12/04/1979 |
| 4173519 | Method, process, system, and apparatus for recovering metal values from ores A method, process, system, and apparatus for recovering metal values such as gold and silver from ores. The process contemplates the prior separation, through appropriate apparatus, of primary slimes from the coarse fraction of ores and each fraction is p... | 11/06/1979 |
| 4159930 | Process for recovering heavy metal ions from dilute aqueous solution A process for treating very dilute solutions containing ecologically noxious heavy metal ions, in which the solutions are made acceptable for return to the environment, and the typically valuable heavy metal present in the solution is recovered at an econ... | 07/03/1979 |
| 4128462 | Electrochemical process for recovering precious metals from their ores An electrochemical process of the type for recovering precious metals such as gold and silver from their ores by adding to a slurry of the ore a cyanide complexing agent such as sodium cyanide and by electrolytically recovering the precious metal. The pro... | 12/05/1978 |
| 4072587 | Separate recovery of silver and gold from cyanide solutions Silver and gold are selectively recovered from cyanide solutions by addition of lime, and precipitation of the silver as sulfide by means of sodium sulfide, followed by electrowinning of gold from the filtrate.... | 02/07/1978 |
| 4053305 | Recovery of copper and silver from sulfide concentrates Copper and silver are recovered from complex sulfide ores or concentrates containing, in addition, metals such as lead, zinc, arsenic, antimony, and iron by leaching with a combination of ferrous chloride and oxygen.... | 10/11/1977 |
| 4038361 | Recovery of nitric acid soluble transition metals from sulfur and iron containing ores of the same The ore is subjected to nitric acid leaching and the leach solution is heated to a temperature at which one of the additional sulfur and iron values is selectively insolubilized with respect to the solution, while the other is maintained in solution for s... | 07/26/1977 |
| 4033763 | Process for recovery of selected metal values from waste waters A process for economically recovering metal values, especially precious metal values, from waste waters comprising a mixture of natural surface water, industrial waste water and organic waste, where the metal values appear in concentrations below levels p... | 07/05/1977 |
| 3996046 | Extraction and purification of silver from sulfates A method is provided for extracting silver from a silver sulfate-bearing substance, such as oxide materials, metal or metal sulfate mixtures containing silver sulfate which comprises subjecting said substance to aqueous leaching to remove soluble salts th... | 12/07/1976 |
| 3956088 | Process for the destruction of developed and undeveloped photosensitive film and the recovery of products therefrom The destruction of developed or undeveloped photographic film in a manner which permits also the recovery of silver and organic components from the film material in which the film is subjected to wet oxidation at high temperature and high pressure in the ... | 05/11/1976 |
