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7604783 |
Reduction of lime consumption when treating refractor gold ores or concentrates
The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by a number of mechanisms, including control of the oxidation...
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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...
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7219804 |
Flotation processing including recovery of soluble nonferrous base metal values
A method of flotation processing ores and other mineral materials containing soluble nonferrous base metal and sulfide minerals involves dissolving the soluble nonferrous base metal and...
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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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7066983 |
Method for thiosulfate leaching of precious metal-containing materials
Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper...
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7025942 |
Control of lead nitrate addition in gold recovery
A method for controlling the extraction of gold from a gold ore by the cyanidation process in which a leaching step including the addition of a lead compound, which is typically lead nitrate or...
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6833021 |
Method for treating precious metal bearing minerals
A method of processing a mineral composition comprising a refractory material the method comprising milling the composition to a particle size of P 80 of less than 25 microns and leaching said...
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6663793 |
Sol-gel-based composite materials for direct-write electronics applications
The present invention relates to a method for producing a low temperature 0-3 composite material, comprising the steps of providing a mixture, wherein the mixture comprises a liquid phase and a...
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6641642 |
High temperature pressure oxidation of ores and ore concentrates containing silver using controlled precipitation of sulfate species
A method for the treatment of sulfide ores containing silver by pressure oxidation. The method includes the addition of a sulfate-binding material to reduce the formation of jarosite species during...
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6482373 |
Process for treating ore having recoverable metal values including arsenic containing components
Roasting of ores with metal values such as precious metal ores for recovery of metal values with conversion of arsenic to an insoluble form in-situ in presence of an additive such as iron and in...
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6461577 |
Two-stage bioleaching of sulphidic material containing arsenic
A method of leaching sulphidic material that contains metals and arsenic under oxidising conditions and with the aid of microorganisms is characterised by mixing the material with an acid aqueous...
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6451275 |
Methods for reducing cyanide consumption in precious metal recovery by reducing the content of intermediate sulfur oxidation products therein
Briefly stated, there is provided a method for reducing cyanide consumption in precious metals mining extraction processes involving a sulfur bearing ore body, comprising the steps of providing a...
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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...
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6383458 |
Biooxidation process for recovery of metal values from sulfur-containing ore materials
A process for the recovery of one or more metal values from a metal ore material comprising those of one or more values and a matrix material having a sulfur content wherein the sulfur is present...
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6355175 |
Method for separating and isolating precious metals from non precious metals dissolved in solutions
A method for separating gold and/or silver from copper or other contaminant metals is provided in which a suitable filter membrane ( 64 ), particularly a nanofilter, is used to form a retentate (...
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6342190 |
Process for increasing recovery of precious metals in an ore processing operation
An ore separation process is provided which begins with a specially designed primary grinding mill. The primary grinding mill grinds the ore into a fine powder which is then blown into the primary...
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6337056 |
Process for refining noble metals from auriferous mines
A process for refining noble metals from auriferous mines, wherein the auriferous material is first milled and treated with a cyanide solution, and comprising: a step for the pretreatment of the...
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6238632 |
Process and composition for removing precious metals from activated carbon
A process for removing precious metals from activated carbon. The activated carbon is contacted with an aqueous solution of methyl ethyl ketoxime and sodium hydroxide.
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6234318 |
Flotation and cyanidation process control
A method for controlling a froth flotation system in a mineral processing operation for recovering metal from a metal source. A rule-based expert system adjusts performance of the froth flotation...
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6228334 |
Method of recovering gold from the fine carbon residue from a coarse carbon gold recovery process
A method for recovering gold from gold-loaded fine carbon residue from a coarse carbon gold recovery process is disclosed. The gold-loaded fine carbon residue is mixed with activated coarse carbon...
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6210648 |
Method for processing refractory auriferous sulfide ores involving preparation of a sulfide concentrate
A method is provided for flotation of refractory auriferous sulfide using an oxygen-deficient flotation gas. The method is particularly suited for non-selective flotation of different...
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6203708 |
Ion exchange resin
An ion exchange resin comprising an ion exchange material dispersed or distributed throughout a polyurethane matrix. The ion exchange material is typically a second polymer which has been...
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6200545 |
Cyanide recovery by solvent extraction
The invention provides a process for recovering hydrogen cyanide from an aqueous solution by extracting the hydrogen cyanide into an organic solvent phase. The organic solvent may comprise a...
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6183710 |
Sodium cyanide paste composition
A sodium cyanide composition having a paste-like consistency is provided which comprises sodium cyanide, a base, water, and a rheology modifier. Also provided are processes for producing and using...
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6107065 |
Nonstirred bioreactor for processing refractory sulfide concentrates and method for operating same
A method of biooxidizing sulfide minerals in a nonstirred bioreactor is provided. According to the disclosed method, a concentrate of sulfide minerals is coated onto a plurality of substrates, such...
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6099615 |
Method for improved percolation through ore heaps by agglomerating ore with a surfactant and polymer mixture
A method for improving bacteria and reagent actions on mineral-bearing particles. In the heap leaching process, the method also increases percolation of the leach solution through the heaped ore...
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6086847 |
Process for treating iron-containing sulfide rocks and ores
A process for treating ores or rocks is provided. The process comprises (1) combining the ores or rocks with an acid passivating agent to produce a first combination; (2) contacting the first...
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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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5961833 |
Method for separating and isolating gold from copper in a gold processing system
A method for separating gold from copper in a gold ore processing system. Gold ore containing elemental gold and elemental copper is treated with an aqueous cyanide solution to produce a liquid...
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5948375 |
Biological oxidation of sulphide minerals to recover gold, silver, platinum group metals and base metals
A process for treating gold bearing sulphide minerals wherein the minerals are subjected to biological oxidation, the product thereof is separated into light and heavy fractions and gold is...
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5916534 |
Noble metal recovery using selected base metal solubilizing agents at low pulp densities
Gold and other noble metal recovery from an ore slurry is improved by operating at low pulp densities, below 35%, and solubilizing base metal present in the slurry by adding to the slurry, either...
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5876588 |
Process for removing and recovering copper, silver and zinc from sulfide ores
Ores containing copper, zinc, silver in the form of sulfides are treated by a solution of sulfurated sulfite ions and ammonium ions in order to remove most of the metals from the sulfide ores. This...
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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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5837210 |
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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5833937 |
Polymeric combinations used as copper and precious metal heap leaching agglomeration aids
An improved method for extracting a precious metal from mineral fines by heap leaching with dilute sulfuric acid which comprises agglomerating the mineral fines prior to formation into a heap with...
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5814292 |
Comprehensive energy producing methods for aqueous phase oxidation
An aqueous phase oxidization process for the oxidization of any nonoxidized feed material using a mixture of a feed material, an oxidizing acid, such as nitric acid; oxygen gas, water and...
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5804150 |
Process for treating gold-containing sulfide ores
The ore which contains gold and at least one of the metals silver, copper, nickel, zinc or iron is calcined at temperatures in the range from 500° to 900° C. with the addition of...
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5783158 |
Process for treating sulfide ores containing gold and/or silver and as accompanying metal at least iron
The ore which contains gold and/or silver and as accompanying metal at least iron is calcined at temperatures in the range from 500° to 900° C. with the addition of oxygen-containing gas. There...
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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...
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5668219 |
Cationic block polymer agglomeration agents for mineral bearing ores
A process for the percolation leaching of minerals from a mineral-beating ore comprises agglomerating the mineral-bearing ore with an agglomerating agent of a cationic block copolymer having a...
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5667557 |
Hydrometallurgical extraction and recovery of copper, gold, and silver via cyanidation and electrowinning
A hydrometallurgical process for treating copper feed materials containing gold and/or silver by simultaneously leaching copper, gold and/or silver into an aqueous cyanide solution, recovering...
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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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5603750 |
Fluorocarbon fluids as gas carriers to aid in precious and base metal heap leaching operations
This invention provides an improved method of leaching precious and base metal values from ore comprising contacting a metal-bearing ore or ore concentrate with an oxidizing gas solution comprising...
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5512636 |
Cationic graft polymer agglomeration agents for mineral bearing ores
Agglomerating agent and method for use in heap leaching of mineral bearing ores. Cationic polymers alone or in combination with cement or lime are highly effective agglomerating agents in acidic or...
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5489326 |
Gold recovery using controlled oxygen distribution pressure oxidation
A process for recovering gold from a refractory auriferous ore containing sulfide sulfur. An aqueous slurry of refractory auriferous ore is subjected to pressure oxidation in an autoclave while the...
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5472675 |
Polyvinyl alcohol agglomeration agents for mineral bearings ores
An agglomerating agent for use in the heap leaching of mineral bearing ores is disclosed. The agglomerating agent is a polyvinyl alcohol of moderate to high molecular weight which is partially or...
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5429659 |
Oxidation of metal sulfides using thermotolerant bacteria
A process for recovering precious or base metals from particulate refractory sulfide materials comprises: a) contacting the sulfide material with an aqueous solution containing a thermotolerant...
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5427606 |
Base metals recovery by adsorption of cyano complexes on activated carbon
A recovery method for base metal values (e.g. copper) from ore slurry or aqueous solution, comprising forming a solution of a metal complex (e.g. cyano-copper) having an affinity for adsorption...
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5425800 |
Recovery of precious metal values from refractory ores
A hydrometallurgical process is described for recovery of precious metals from ores refractory to treatment by lixiviating agents by crushing the ore to no finer than a nominal 1/4 inch size,...
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5380504 |
Treatment of gold bearing ore
The present invention relates to a process for roasting gold containing ore in which a flash furnace means is provided, in particular a gas suspension furnace for roasting the ore. Hot gas and the...
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