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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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7175819 |
Regeneration of cupric etchants and recovery of copper sulfate
Spent, acidic solutions comprising cupric chloride and hyrdrochloric acid from the copper etching process are regenerated by a process in which the acid is subjected to distillation with sulfuric...
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6921426 |
Process of recovering copper from ore
A copper concentrate obtained by flotation of a high grade copper ore containing chalcopyrite as a main mineral constituent is leached at a temperature of 100° C. or higher, and under a pressure...
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6846346 |
Sulfatization process for metal extraction from sulfide ores
The invention provides a hydrometallurgical process for treating metal-containing sulfide ores and concentrates, comprising reacting said metal-containing sulfide with concentrated sulfuric acid at...
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6843970 |
Process for recovering metal values by dissolving them in a sulfuric acid solution containing a carbon source and a reducing agent
A process for recovering metal values from a metal containing material including the metal values comprising digesting the metal containing material in a sulfuric acid solution comprising sulfuric...
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6569391 |
Heap leaching copper ore using sodium nitrate
The heap leaching of copper bearing ores is improved by using sodium nitrate as an oxidizing chemical reactive in a sulphuric acid leaching solution. In particular, the ore is crushed to <6 mm...
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6455019 |
Process for the extraction of copper from a sulphide copper ore or concentrate
A process for the extraction of copper from a sulphide ore or concentrate comprises the steps of subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic...
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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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6409799 |
Copper leach process aids
Methods for enhancing the leaching of copper from copper bearing ores with an aqueous sulfuric acid leach solution are disclosed wherein an antifoam formulation stable at a solution pH of about 1...
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6280501 |
Base metal recovery
A process for recovering a base metal from a material, the base metal being selected from cobalt, copper, nickel and zinc, the process comprising the steps of reacting the host material with a...
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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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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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6168766 |
Process for leaching copper from copper sulfide using bacteria
Disclosed is a process for leaching copper from copper sulfide using bacteria, which ensures that the rate of leaching of copper increases to reduce the leaching time period and that the rate of...
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6159435 |
Leaching of mineral ores
A process for oxidation of ferrous ions in solution, and more particularly a process for improved base metal and/or uranium leaching from ores, concentrates or tailings using ferric ion as an...
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5895633 |
Solvent extraction process for recovering copper from copper-containing solutions
The present invention is directed to a process for recovering copper from a copper-containing material by pressure oxidation followed by solvent extraction and electrowinning. The copper-containing...
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5827348 |
Leaching of precious metal ore with fluoroaliphatic surfactant
A method for improving the recovery of gold and silver from precious metal ore is disclosed. The method comprises contacting precious metal ore with an aqueous solution containing certain...
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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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5730776 |
Hydrometallurgical process for the extraction of copper from sulphidic concentrates
There is provided a novel hydrometallurgical process for the extraction of copper from sulphidic concentrates involving an oxidizing pressure leach using dilute sulphuric acid and a carbonaceous...
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5709731 |
Slurry pipeline leaching method
A method for concurrently transporting and leaching metal values from an ore or concentrate containing said metal values from an originating site such as an elevated site to a delivery site...
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5698170 |
Hydrometallurgical process for copper-containing materials
The present invention is directed to a process for recovering copper from a copper-containing material by pressure oxidation followed by solvent extraction and electrowinning. The copper-containing...
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5645708 |
Chloride assisted hydrometallurgical copper extraction
A process for the extraction of copper from a sulphide copper ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic chloride...
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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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5484579 |
Hydrometallurical recovery of copper and zinc from complex sulfide ores
A continuous hydrometallurgical process for conversion of ore derived copper and zinc sulfides into recoverable water soluble sulfates is provided. The process comprises: i) contacting the ore...
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5397380 |
Method for processing complex metal sulphide materials
A process for the treatment of complex metal sulphide materials and for the recovery of metal values from such materials. The process involves first subjecting the material to a leaching process...
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5332560 |
Process for the removal of zinc and nickel from copper ammine sulfate solutions
A method for the recovery of copper from copper-containing materials, for example, scrap, ores or dust. An aqueous cupric tetrammine sulfate lixiviant is contacted with the copper-containing...
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5316567 |
Hydrometallurgical copper extraction process
A process for the extraction of copper from a sulphide copper ore or concentrate comprises the steps of subjecting the ore or concentrate to agitation leaching at an elevated temperature and...
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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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5271909 |
Method of tellurium separation from copper electrorefining slime
A method of increasing the extraction of tellurium from copper electrorefining slime comprises leaching the slime with dilute sulphuric acid in a reactor under a partial oxygen pressure of up to...
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5232490 |
Oxidation/reduction process for recovery of precious metals from MnO.sub.2 ores, sulfidic ores and carbonaceous materials
A process for separating precious metals from an MnO 2 , sulfidic or carbonaceous refractory ore or refractory feed such as tailings is provided. The process includes the step of leaching a feed...
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5200042 |
Process to recover pure copper during purification of zinc sulfate solution
A process for recovery of copper from a copper residue obtained during purification of a zinc sulfate solution comprises leaching the copper residue in a concentrated sulfuric acid solution in the...
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5173276 |
Method for recovery of copper from copper-containing materials
A process for precipitating solid hydrates of cupric tetrammine sulfate from a solution, wherein the solution contains at least 40 grams per liter of free ammonia, at least 50 grams per liter of...
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4960584 |
Adjustable emitter for heap leach mining percolation system and method
A system for heap leach mining comprises supply and header pipes for conducting a leaching solution alongside a bed or "heap" of crushed metal-laden ore deposited on an impervious pad. A series of...
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4875935 |
Anionic acrylamide polymers as copper ore agglomeration aids
An improved method for extracting copper from copper minerals by heap leaching with dilute sulfuric acid which comprises agglomerating the copper mineral fines prior to their being formed into an...
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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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4786323 |
Process for the recovery of noble metals from ore-concentrates
A process for the hydrometallurgical recovery of gold and silver by direct oxidizing sulphuric acid-digestion of arsenopyrite-concentrates (FeAsS 2 ) containing carbonaceous materials with a...
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4778519 |
Recovery of precious metals from a thiourea leach
A method is provided for recovering gold and silver from precious metal bearing materials including ores, leaching residues, flue dust, electronic scrap, jewelry scrap, etc. In the method, the gold...
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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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4752332 |
Treating manganese-containing ores with a metal sulfide
A process for treating a first metal, manganese-containing ore comprising contacting the manganese-containing ore with an aqueous, acidic composition and a material containing at least one metal...
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4740243 |
Metal value recovery from metal sulfide containing ores
A process for recovering at least one first metal from a metal sulfide-containing ore comprising contacting the ore with an aqueous, acidic composition and at least one reducible...
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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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4731113 |
Method for the recovery of precious metals from ores
A process for the recovery of precious metals from ore containing the same is disclosed. The process includes the formation of a lixiviant solution including a thiourea compound, urea and an alkali...
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4698139 |
Hydrometallurgical method for treating valuable metal raw materials containing chlorides and fluorides
The purpose of the method is to remove chlorides and fluorides from a valuable metal raw material by leaching the raw material into sulphuric acid solution and by crystallizing the valuable metal...
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4671945 |
Method for separation and leaching of the valuable metals in sulphide materials
This is a method for the complete leaching of the valuable metals in a metal sulphide material which contains copper, zinc, lead, silver and iron by the use of a solution which essentially contains...
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4670052 |
Process for the recovery of gold from a precious metal bearing sludge concentrate
A process for the recovery of gold from a precious metal bearing sludge concentrate is disclosed. The process comprises the steps of leaching the sludge with hydrochloric acid and hydrogen peroxide...
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4662938 |
Recovery of silver and gold
This invention provides processes for selectively recovering silver and gold values from feed materials containing both precious metals, and comprises leaching the feed material with a hot ferric...
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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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4620964 |
Process for the treatment of complex manganese ores, such as marine nodules
A process for the treatment of a complex manganese ore, wherein it comprises the following stages: (a) crushing the ore, (b) subdividing the crushed ore into a first part and a second part, ...
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4619814 |
Process for the recovery of non-ferrous metals from sulphide ores and concentrates
This invention relates to the development of a viable metallurgical process capable of treating low grade concentrates, bulk concentrates, dirty concentrates, or ore directly for the recovery of...
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4615731 |
Hydrometallurgical processing of precious metal-containing materials
A hydrometallurgical process is provided for separating heavy metal nuisance elements such as As, Sb, Bi, Sn and Pb from precious metals and/or selenium. The process can be used as a step in an...
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