Did You Know...
...that it was melting ice cream that inspired the invention of the outboard motor? It was a lovely August day and Ole Evinrude was rowing his boat to his favorite island picnic spot. As he rowed, he watched his ice cream melt and wished he had a faster way to get to the island. At that moment the idea for the outboard motor was born!
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| Number | Title | Issue Date |
| 8025859 | Process for gold and silver recovery from a sulphide concentrate A process for the extraction of a precious metal, such as gold or silver, from a sulphide ore or concentrate or other source material comprises subjecting the source material to pressure oxidation to produce a pressure oxidation slurry. The pressure oxidation slurry... | 09/27/2011 |
| 7311786 | Passivation of sulfidic iron-containing rock A method for passivating sulfidic iron-containing rock comprising: contacting sulfidic iron-containing rock with a magnesium-containing substance, a manganese-containing substance, and a calcium-containing substance; and adjusting the pH of the system to below about... | 12/25/2007 |
| 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 |
| 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 |
| 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 |
| 5851499 | Method for pressure oxidizing gold-bearing refractory sulfide ores having organic carbon Provided is a method for treating refractory gold-bearing ores that have both sulfide material with which the gold is associated and from which the gold is difficult to separate and having organic carbonaceous material having an affinity for at least one ... | 12/22/1998 |
| 5653945 | Method for processing gold-bearing sulfide ores involving preparation of a sulfide concentrate Provided is a method for processing a gold-bearing sulfide ore which involves maintaining the ore in a substantially oxygen free environment, preferably beginning with comminution of the ore and ending when a desired final concentrate, enriched in sulfide... | 08/05/1997 |
| 5536480 | Method for treating mineral material having organic carbon to facilitate recovery of gold and silver Provided is a process for treating refractory precious metal-containing ores, particularly gold-bearing ores, which are refractory due to the presence of organic carbon, to reduce the ability of organic carbon to interfere with recovery of the precious me... | 07/16/1996 |
| 5458866 | Process for preferentially oxidizing sulfides in gold-bearing refractory ores A process is provided for recovering gold from refractory sulfide ores. Preferred feed materials have multiple different sulfide mineralogies, with gold being primarily contained within one or more, but not all, of the sulfide mineralogies. Sulfide minera... | 10/17/1995 |
| 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 |
| 5328669 | Extraction of precious metals from ores and other precious metal containing materials using halogen salts Platinum group metals, gold and silver are extracted from complex ores, automobile scrap, refractory ores and as naturally occurring by leaching the precious metal containing materials with a solution containing halogen salts such as potassium or sodium i... | 07/12/1994 |
| 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 |
| 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 |
| 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 |
| 5190578 | Method for hydrometallurgical processing of friable concentration products A method for hydrometallurgical processing of friable concentration products containing precious nonferrous and ferrous metals comprising preliminary magnetic separation of friable products to pass ferrous metals into the magnetic product and to produce a... | 03/02/1993 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
