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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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4606766 |
Process for separately recovering gold and silver from solution by carbon adsorption
A process for separately recovering gold and silver from a solution containing dissolved gold and silver by carbon adsorption which comprises passing the solution sequentially through a series of...
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4587110 |
Process of recovering copper and of optionally recovering silver and gold by a leaching of oxide- and sulfide-containing materials with water-soluble cyanides
A process is described by which copper and optionally silver and gold are recovered from sulfide and oxide ores, concentrates or slag, which contain the metals. The particulate materials are...
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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...
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4559209 |
Leaching refractory gold ores
A method is disclosed for leaching a gold ore which is refractory due to the presence of sulphide minerals of arsenic and antimony. The ground ore is leached with cyanide in a pipe reactor at a...
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4555385 |
Elution process and apparatus and extraction of particulate material from a vessel
An introduction process and apparatus is described concerning the continuous elution of a value, i.e. a metal value such as gold, from a particulate carrier by a counterflow of stripping liquid...
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4552589 |
Process for the recovery of gold from refractory ores by pressure oxidation
A process for recovering precious metals from a refractory ore by forming a slurry which is heated to a temperature in excess of about 150° C. at an oxygen partial pressure in excess of about 10...
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4438076 |
Method of extracting gold and silver from an ore
Gold and/or silver is leached from comminuted ore with an alkaline cyanide lixiviant at a superatmospheric pressure of at least 25 bar and with high purity oxygen (at least 90% pure) to reduce the...
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4401468 |
Process for removing precious metals from ore
An improved cyanide process sprays an ore-cyanide leach solution into air at a high velocity to oxygenate the slurry and catalyze the reaction between the ore and cyanide leach solution.
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3224835 |
Treatment of sulfidic material
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1002447 |
Title is not available
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