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| Number | Title | Issue Date |
| 7691346 | Process for recausticizing cyanide leach solutions A method is shown for raising the pH of a cyanide leach solution of the type used in a heap leaching mining operation. Lime slurry is mixed with a side stream of barren cyanide solution in a reactor vessel in order to remove carbonate hardness, to regenerate the hyd... | 04/06/2010 |
| 7157062 | Inhibition of the depletion of metal values from pregnant lixiviant solutions Methods for inhibiting depletion of mineral values from pregnant lixiviant solutions comprise contacting the requisite metal ore with a preg-robbing inhibition agent (PRIA) comprising (I) alkyl polyglucoside surfactants; (II) imidazoline based amphoteric surfactants... | 01/02/2007 |
| 6406675 | Method for reducing cyanide consumption during processing of gold and silver ores to remove base metals A method for reducing consumption of cyanide and level of carbon fouling during cyanide extraction of gold and silver from their ores by treating the ore or aqueous slurry of the ore with a water-soluble sequestering agent for the base metal species for a... | 06/18/2002 |
| 6296679 | Method for hydrocarbon steam reforming In a process for hydrocarbon steam reforming, a primary reformed gas is produced from a mixed gas of hydrocarbon and steam with use of a primary reforming means including an external combustion type of reforming furnace. A secondary reforming reaction of ... | 10/02/2001 |
| 6183706 | Autoclave having an agitator with an aerating impeller for high oxygen transfer rate to metal-containing slurries and method of use A method is disclosed for recovering a metal from a metal containing material by autoclaving with an autoclave which includes an agitator that includes a first inlet for a recycled oxygen-containing gas, a second inlet for a fresh oxygen-containing gas, a... | 02/06/2001 |
| 5985221 | Method of recovering precious metals The invention relates to a method of recovering precious metals from oxidic or refractory or semi-refractory ore material containing precious metal. This recovery of precious metal takes place with optimal comminution work and with more efficient and more... | 11/16/1999 |
| 5346532 | Process and apparatus for recovering metal values from ore A process and apparatus for recovering metal values from ores is described. Comminuted ores are mixed with a liquid to form a pulp. A plurality of streams of pulp are then projected against one another, thereby causing erosion of ore particles in the pulp... | 09/13/1994 |
| 5279802 | Precious metal recovery process from sulfide ores A process for recovering at least one precious metal from an ore containing carbonaceous material is disclosed. The process involves the use of promoting amounts of certain metal redox couples and/or metal components, in particular, certain metal complexe... | 01/18/1994 |
| 5279803 | 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 promoting amounts of certain metal redox couples and/or metal components, in particular, certain metal complexe... | 01/18/1994 |
| 5275791 | Process for the leaching of gold and silver with cyanidic leaching solution and controlled addition of hydrogen peroxide A process is described for leaching gold and/or silver from ores or ore concentrates using an aqueous alkaline cyanide solution with addition of hydrogen peroxide. The addition of the aqueous H2 O2 solution is regulated and controlle... | 01/04/1994 |
| 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 |
| 5250272 | Process for leaching precious metals with hydrogen-peroxide and a cyanide leaching solution A process for leaching gold and silver from ores and ore concentrates is disclosed using a cyanide leaching solution and hydrogen peroxide and maintaining an oxygen concentration of 2 to 20 Mg of O2 /liter. In the invention, leaching takes plac... | 10/05/1993 |
| 5229085 | Utilization of oxygen in leaching and/or recovery procedures employing carbon In gold and/or silver cyanide leaching-adsorption processes employing solid adsorbents such as activated charcoal, the overall efficiency in the recovery of gold and/or silver from ores or the like is greatly increased by contacting the cyanide slurry con... | 07/20/1993 |
| 5169615 | Processes for removing cyanide from mill tailings Mill tailings containing cyanide species can be treated with carbon dioxide in order to drive-off and/or recover the cyanide content of said tailings.... | 12/08/1992 |
| 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 |
| 5078977 | Cyanide recovery process A process for removing and recovering cyanide from a cyanide-containing mixture. The process includes the steps of adjusting the pH of the cyanide-containing mixture to between about 6 to about 9.5, volatilizing the HCN contained in the pH adjusted mixtur... | 01/07/1992 |
| 4994243 | Cyanide regeneration process A process for removing and recovering cyanide from a cyanide-containing solution. The process includes the steps of adjusting the pH of the cyanide-containing solution to between about pH 6 and about pH 9.5, volatilizing the HCN contained in the pH adjust... | 02/19/1991 |
| 4979986 | Rapid oxidation process of carbonaceous and pyritic gold-bearing ores by chlorination A method of treating a gold-bearing ore to render the gold component of the ore more amenable to standard cyanidation treatment in a reduced amount of time is disclosed. An aqueous slurry of the gold-bearing ore is introduced into at least one vessel. An ... | 12/25/1990 |
| 4979987 | Precious metals recovery from refractory carbonate ores Precious metal values, particularly gold and silver, are liberated from refractory, carbonate ores by adjusting the molar ratio of sulfide to total acid consumers to between about 1.2 and about 3.2 in the ore feed to a pressure oxidation process. The ore ... | 12/25/1990 |
| 4971625 | Method for leaching gold and/or silver out of ores or out of ore-concentrates and also out of precious-metal wastes or precious-metal scrap by using cyanide-containing leaching solutions A method for leaching gold and/or silver out or other precious metal containing substance using cyanide-containing leaching solutions and adding an aqueous H2 O2 solution to accelerate leaching. The total amount of the hydrogen-perox... | 11/20/1990 |
| 4968346 | Method for eluting adsorbed gold from carbon Gold in a very dilute water solution is carbon filtered to capture the gold by adsorption; the gold in the filter is then recovered from the carbon by means of a highly-efficient non-explosive low-alcohol water-based eluant including a strong base and an ... | 11/06/1990 |
| 4941917 | Process for recovery of precious metals from carbonaceous ores using chlorine dioxide Carbonaceous ore containing a precious metal (gold) is treated with an aqueous solution of chlorine dioxide to enhance the recovery of the precious metal.... | 07/17/1990 |
| 4923510 | Treatment of refractory carbonaceous sulfide ores for gold recovery Refractory carbonaceous sulfide ores are treated in a manner so as to improve gold recovery by a treatment in specific combination of steps whereby the ore is treated with chlorine after pretreatment and before cyanidation; the particular steps in the tre... | 05/08/1990 |
| 4919715 | Treating refractory gold ores via oxygen-enriched roasting Gold-containing ores, having refractory sulfidic matter or a combination of refractory sulfidic matter and refractory carbonaceous matter, are processed to recover their gold values. The process uses an ore roasting procedure that utilizes a two-state, fl... | 04/24/1990 |
| 4898611 | Polymeric ore agglomeration aids The agglomeration of gold or silver ore fines is improved by the use of a water-soluble vinyl polymer as the agglomerating agent.... | 02/06/1990 |
| 4822413 | Extraction of metal values from ores or concentrates A process is described for leaching ores or concentrates containing one or more metallic sulphides .with a circulating liquor so as to solubilize desired metal values therefrom, if said metal values are capable of dissolution in an acidic ferric sulphate ... | 04/18/1989 |
| 4801329 | Metal value recovery from carbonaceous ores A process for recovering a first metal, e.g., gold, from a carbonaceous ore comprising contacting the ore with an added metal component other than an alkali metal or alkaline earth metal component in an amount effective to at least promote the oxidation o... | 01/31/1989 |
| 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 |
| 4754953 | Utilization of oxygen in leaching and/or recovery procedures employing carbon In gold and/or silver cyanide leaching-adsorption processes employing solid adsorbents such as activated charcoal, the overall efficiency in the recovery of gold and/or silver from ores or the like is greatly increased by contacting the cyanide slurry con... | 07/05/1988 |
| 4738718 | Method for the recovery of gold using autoclaving A gold recovery pretreatment process is disclosed in which the gold content is more completely extracted from refractory sulfidic ores which contain large quantities of metal carbonates such as dolomite than occurs in traditional gold extraction methods. ... | 04/19/1988 |
| 4734270 | Sulfide treatment to inhibit mercury adsorption onto activated carbon in carbon-in-pulp gold recovery circuits In this invention sulfide compounds are added to mercury and precious metal-containing carbonaceous ore slurries prior to the slurry being processed by a carbon-in-pulp system. The sulfide compound inhibits the mercury from being adsorbed onto the activat... | 03/29/1988 |
| 4731114 | Recovery of precious metals from refractory low-grade ores Low-grade refractory gold ores, which may also contain silver and other metal values are treated by partial roasting of concentrate to remove controlled amounts of sulfur and carbon, then oxygen pressure leached to oxidize further amounts of sulfur and ca... | 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 |
| 4721526 | Heap leaching with oxygen A method and system for the percolation leaching of gold and silver ores applies a cyanide leaching liquid to a pile of gold and silver ore. Heap leaching, vat leaching, or the like may specifically be practiced. The cyanide leaching liquid is applied to ... | 01/26/1988 |
| 4710361 | Gold recovery by sulhydric-fatty acid flotation as applied to gold ores/cyanidation tailings Gold values are obtained from gold cyanidation tailings or gold bearing ores by treating the same with a flotation collector consisting of 5 to 20% xanthate collector and 80 to 95% fatty acid collector of a pulp pH range from 5 to 8.... | 12/01/1987 |
| 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 |
| 4681628 | Gold Recovery processes The invention relates to a process for the recovery of gold from an alkaline aqueous liquid solution containing gold-cyanide ion, and possibly silver and/or copper and/or mercury, which comprises adding a quantity of thiourea to the solution so as to allo... | 07/21/1987 |
| 4654079 | Process for improving the extraction yield of silver and gold in refractory ores A process for the extraction of silver and gold from refractory ore is disclosed. The process includes first grinding the refractory ore. This ground refractory ore is subsequently treated with an alkali solution of a stoichiometric excess amount of sulph... | 03/31/1987 |
| 4632701 | Process for the recovery of silver from a residue essentially free of elemental sulphur A process for the recovery of silver from a residue essentially free of elemental sulphur obtained by acidic pressure oxidation leaching or iron-containing sulphidic material which comprises forming a slurry of the residue with lime at a temperature of at... | 12/30/1986 |
| 4629502 | Pressurized reaction of refractory ores with heat recovery Metal is removed from particlized metal bearing refractory ores in an efficient manner utilizing pressure metallurgy with heat recovery. The particlized ore is mixed with a heated liquid, and preferably a flocculant and fibers, to form a slurry. The ore i... | 12/16/1986 |
