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7491372 |
Procedure to leach copper concentrates, under pressure and at ambient temperature, by forming a reactive gel in a sulfate-chloride medium
A chemical process to leach copper concentrates in the presence of a concentrated solution of sulfates and chlorides. The process includes forming a high reactivity chemical paste containing a high...
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7341700 |
Method for recovery of metals from metal-containing materials using medium temperature pressure leaching
The present invention relates generally to a process for recovering copper and other metal values from metal-containing materials using controlled, super-fine grinding and medium temperature...
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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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6608001 |
Catalyst and method of making micrometer sized spherical particles
A method for producing small spherical particles that are especially useful as catalysts and catalyst supports employed in chemical processes is disclosed. According to some embodiments, the method...
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6569224 |
Hydrometallurgical process for the recovery of nickel and cobalt values from a sulfidic flotation concentrate
A hydrometallurgical process for the recovery of nickel and cobalt values from a sulfidic flotation concentrate. The process involves forming a slurry of the sulfidic flotation concentrate in an...
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6537796 |
Conversion of geothermal waste to commercial products including silica
A process for the treatment of geothermal residue includes contacting the pigmented amorphous silica-containing component with a depigmenting reagent one or more times to depigment the silica and...
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6455018 |
Recovery of precious metal and other values from spent compositions/materials
Precious metal values, e.g., platinum, palladium and rhodium, and, optionally, other valuable elements, e.g., one or more rare earths and cerium in particular, are recovered from a wide variety of...
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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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6277341 |
Process for the rapid leaching of chalcopyrite in the absence of catalysts
A process is provided for the leaching of copper from chalcopyrite using ferric sulfate in which acceptable rates of leaching are achieved by controlling the surface potential of the chalcopyrite...
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6110254 |
Method for chemical precipitation of metallic silver powder via a two solution technique
A method for the chemical precipitation of metallic silver powder employs a two solution technique in which a solution of a tin salt and a solution a silver salt are mixed in the presence of an...
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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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5929001 |
Engineered flux-pinning centers in BSCCO TBCCO and YBCO superconductors
A method of preparing a high temperature superconductor. A method of preparing a superconductor includes providing a powdered high temperature superconductor and a nanophase material. These...
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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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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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5254320 |
Method for roasting sulphide ores
A method for roasting sulphide ores or ore concentrates containing precious metals is practiced in a furnace, typically in a fluidized bed. The ore and a sulphur-binding lime-containing material...
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5250273 |
Hydrometallurgical leaching process and apparatus
A process and apparatus for leaching metal values from a particulate mineral ore containing metal values employs a fluidized bed of the particles; a leaching agent solution containing dissolved...
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5196178 |
Method of producing dustfree silver nitrate
In order to produce dustfree silver nitrate which can be readily dosed, silver nitrate is atomized in a molten state. A purity of the silver nitrate of greater than 99%, a pH of 2 to 6, and the...
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5147617 |
Process for recovery of gold from gold ores using a complexing pretreatment and sulfurous acid leaching
A process for recovering gold from gold-bearing ores includes the steps of forming a slurry of ground ore and treating the ore with an oxidizing and complexing agent such as hydrogen sulfide or a...
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5147618 |
Process for recovery of gold from refractory gold ores using sulfurous acid as the leaching agent
A process for recovering gold from refractory gold-bearing ores uses sulfurous acid as the leaching agent to form a gold-sulfite complex. The ore is ground, slurried blended with a chelating agent...
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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...
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4571387 |
Biological-acid leach process
A process for leaching copper from copper sulphide containing ore, in particular copper from chalcopyrite containing ore, is provided. The ore is preferably initially ground up and mixed with an...
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4483827 |
Hydrometallurgical process for the recovery of valuable metals from sulfidic, silicate-containing raw materials
The invention relates to a process for the recovery of valuable metals from sulfidic, silicate-containing raw materials by slurrying the raw material in water, by subjecting the slurry to a...
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4337226 |
Recovery of platinum-group metals from ores
Metal values are recovered from ore concentrates by means of dry grinding, followed by a two-stage leaching process in which the ground concentrate is first leached with sulfuric acid at a...
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4269676 |
Method of winning copper and accompanying metals from sulfidic ores, post-flotation deposits and waste products in the pyrometallurgical processing of copper ores
The invention relates to a method of winning copper and accompanying metals from sulfidic ores, post-flotation deposits and waste products in the pyrometallurgical processing of copper ores. In...
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4192851 |
Leaching of metal sulphides
The process of the invention is for the separate recovery of elemental sulfur and residual sulfides and metal salt solution from reaction slurries obtained from leaching of metal sulfides in ores...
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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...
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3949051 |
Hydrometallurgical process for extracting copper from chalcopyrite or bornite concentrates
A process for extracting copper from a copper-containing concentrate by comminuting the concentrate in the presence of a liquid dispersing agent which inhibits agglomeration and forms a pulp, and...
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3632308 |
RECOVERY OF COPPER VALUES FROM SLAG
Recovery of metal values from slag, produced during the pyrometallurgical processing of metal concentrate or scrap material, by grinding the slag, agitating the ground slag with sulfuric acid in a...
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3528784 |
METHOD FOR PRELIMINARY BENEFICIATION OF CALCAREOUS OXIDIZED COPPER ORES BY FLOTATION OF A HIGH ACID-CONSUMING FRACTION CONTAINING LOW COPPER VALUES FROM A LOW ACID-CONSUMING FRACTION CONTAINING HIGHER COPPER VALUES
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3282682 |
Process for the extraction of copper
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3266889 |
Method of extracting metals from sulfide ores using bacteria and an accelerating agent
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3241950 |
Aqueous acid oxidation of copper bearing mineral sulphides
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3230071 |
Recovery of metal values from complex ores
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3088820 |
Process for the recovery of metal values from low grade materials
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2847300 |
Process for recovering metal values from ore
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2830895 |
Method of recovering metal values from ores
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2827372 |
Process of extracting gold
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1002447 |
Title is not available
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3582317 |
Title is not available
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3777005 |
Title is not available
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3574541 |
Title is not available
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