|
Match
|
Document |
Document Title |
|
|
8163063 |
Method of leaching copper sulfide ore with the use of iodine
An object of the present invention is to provide a method of efficiently leaching copper from a copper sulfide ore containing chalcopyrite or enargite as a main constituent under versatile...
|
|
|
8070851 |
Chloride heap leaching
A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride/sulphate solution in the presence of oxygen with the surface...
|
|
|
7968065 |
Process for the recovery of value metals from base metal sulfide ores
A process for leaching a value metal from a base metal sulfide ore, comprising the step of leaching the ore with a lixiviant comprising a chloride, an oxidant and hydrochloric acid is disclosed....
|
|
|
7918919 |
Process for mercury control during pressure oxidation
A method for suppressing mercury dissolution during pressure oxidation of precious metal-containing materials in the presence of halogens and halides is provided. Pressure oxidation is performed...
|
|
|
7892505 |
Hydrometallurgical process for the treatment of metal-bearing sulfide mineral concentrates
A hydrometallurgical process for the treatment of complex silver-bearing sulfide ores and concentrates that recovers substantially all silver, lead, antimony, zinc, copper and sulfur, along with...
|
|
|
7858056 |
Recovering metals from sulfidic materials
A process for recovering a precious metal from a sulfidic material comprises the steps of preparing an acidic aqueous halide solution having an oxidation potential sufficient to oxidize the...
|
|
|
7799114 |
Method for recovering gold
The invention relates to a method for recovering gold in connection with the hydrometallurgical production of copper from a waste or intermediate product containing sulphur and iron that is...
|
|
|
7794677 |
Reduction of copper content in the molybdenite concentrate
Methods and systems for removing copper minerals from a molybdenite concentrate. One embodiment provides leaching copper from the molybdenite concentrate with a leaching solution comprising ferric...
|
|
|
7749302 |
Method for the hydrometallurgical treatment of sulfide concentrate containing several valuable metals
The invention relates to a method, by means of which the valuable metals contained in a sulphidic, multicomponent concentrate are recovered using hydrometallurgical treatment. One constituent of...
|
|
|
7736606 |
Process for the recovery of value metals from base metal sulfide ores
A process for leaching a value metal from a base metal sulfide ore, comprising the step of leaching the ore with a lixiviant comprising a chloride, an oxidant and hydrochloric acid is disclosed....
|
|
|
7682420 |
Method for leaching gold
In a method for leaching gold from copper sulfides, the sulfide ores are first subjected to leaching of copper, thereby producing a leaching residue having 7.9% or less of the copper content. This...
|
|
|
7670509 |
Composite nanofiber, composite nanofiber association, complex structure, and production method thereof
A silica nanofiber is derived from a crystalline polymer filament of a polymer including straight chain polyethyleneimine backbones, which is capable of forming a water-insoluble crystal in the...
|
|
|
7537741 |
Gold and silver recovery from polymetallic sulfides by treatment with halogens
A method for treating a polymetallic sulfide ore containing gold and/or silver, and further containing base metals selected from the group consisting of iron, aluminum, chromium, titanium, copper,...
|
|
|
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...
|
|
|
7045364 |
Electrochemical immunoassays using colloidal metal markers
The invention concerns a method for detecting or quantifying a biological substance coupled with a colloidal metal particle by electrochemical detection, characterised in that it comprises a step...
|
|
|
6933861 |
Key-operating device for a hand-held video game apparatus
A key-operating device includes a shell confining a chamber therein and connected to a video game apparatus with depressible keys, a lever pivotally mounted in the chamber and having protrusions...
|
|
|
6770249 |
Process to selectively recover metals from waste dusts, sludges and ores
A hydrometallurgical process utilizing an atmospheric calcium chloride leach to selectively recover from various metal feed stocks (consisting of elemental metals, metal oxides, metal ferrite,...
|
|
|
6516633 |
Photochromic glass nanoparticles and methods of preparation
The present invention is directed to microemulsion techniques for rapidly preparing photochromic glass nanoparticles and to the photochromic glass nanoparticles so prepared. More particularly, the...
|
|
|
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...
|
|
|
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...
|
|
|
6440376 |
Method for dissolving noble metals out of segregated ores containing noble metals
A method for dissolving noble metals out of segregated ores containing noble metals, comprising: reducing noble metal oxides present to the individual metals in finely divided form;oxidating the...
|
|
|
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...
|
|
|
6030433 |
Method for extracting metals from metal-containing materials by pyrohydrolysis
A method for extracting metals from metal-containing materials, especially waste, by pyrohydrolysis. The metal-containing materials which contain at least one or more of the metals from the group...
|
|
|
5989311 |
Recovery of copper from its sulfides and other sources using halogen reagents and oxidants
Copper and nickel are extracted from their elemental state, complex sulfides, ores, and other materials such as scrap by leaching them with a solution containing halogen salts: bromine/bromide, or...
|
|
|
5955254 |
Production of silver halide emulsions
The production of a silver halide emulsion in an aqueous protective colloid solution by the reaction of, on the one hand, silver nitrate, and, on the other, at least one water-soluble halide, may...
|
|
|
5942024 |
Method of recovering gold powder
A method comprising the steps of solvent extracting a gold bearing chlorination leach solution with DBC, scrubbing the resulting gold bearing organic phase with hydrochloric acid and reducing gold...
|
|
|
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...
|
|
|
5401296 |
Precious metal extraction process
There is disclosed a process useful for the extraction of gold, silver, and the platinum metals from precious metal containing ores which poses no threat to the environment or the ground water. The...
|
|
|
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...
|
|
|
5304359 |
Dissolution of platinum group metals from materials containing said metals
A method is provided for the dissolution of at least one precious metal selected from the group consisting of platinum group metals, gold and silver. The method comprises subjecting a material...
|
|
|
5264191 |
Quaternary ammonium trihalide and method for dissolution of metal with liquid containing the compound
A quaternary ammonium trihalide, a novel compound, represented by the formula: [A--R']+ X3-(wherein A stands for a trialkyl-amino radical or a pyridyl radical, R' for an alkyl radical of 6 to 22 c...
|
|
|
5238662 |
Processes for recovering precious metals
Disclosed is a process for recovering precious metals using a combination of smelting and an effective utilization of molten salt chlorination. More specifically, disclosed is a process including...
|
|
|
5232490 |
Oxidation/reduction process for recovery of precious metals from MnO2 ores, sulfidic ores and carbonaceous materials
A process for separating precious metals from an MnO2, sulfidic or carbonaceous refractory ore or refractory feed such as tailings is provided. The process includes the step of leaching a feed with...
|
|
|
5215575 |
Recovery of gold, silver and platinum group metals with various leachants at low pulp densities
In the recovery of noble metals, including gold, silver and members of the platinum group, the ores or tailings are subjected to the action of various leaching agents, namely, sodium cyanide,...
|
|
|
5169503 |
Process for extracting metal values from ores
Metal values are solubilized from ore by a lixiviant having a pH from 5 to 8, comprising an aqueous solution of a chloride salt and a hypochlorite salt. Cyanuric acid may be added to retard...
|
|
|
5139752 |
Method for extraction of gold and silver from ore with a solution containing a halogen, halogenated salt and organic solvent
From an ore containing gold and silver, the gold and silver are extracted by a method which comprises pulverizing the ore and bringing the pulverized ore into contact with an elemental halogen, a...
|
|
|
5137700 |
Processes employing iodine-iodide etching solutions
Aqueous iodine-iodide etching solutions are employed in the recovery of precious metals. Elemental iodine is precipitated from spent etching solutions and used to supply both the iodine and iodide...
|
|
|
5120523 |
Method for dissolution of metal
A metal is dissolved by a method which comprises establishing contact of the metal with a quaternary ammonium compound and a halogenated hydrocarbon or with a quaternary ammonium compound, a...
|
|
|
5104445 |
Process for recovering metals from refractory ores
The present invention is a process to recover metals from refractory ores. It involves the chlorination of an ore concentrate in the presence of solid salt at a temperature between 300° and 650° C...
|
|
|
5051128 |
Elution process for gold-iodine complex from ion-exchange resins
A process for eluting gold-iodine complex from an ion-exchange resin, characterized by adding sulfuric acid and sodium nitrite to the gold-iodine complex adsorbed on the resin, and adding sodium...
|
|
|
4997532 |
Process for extracting noble metals
The invention provides a hydrometallurgical process for extracting noble metals from raw materials containing the same, comprising (a) leaching the raw materials with a mineral acid to leave a...
|
|
|
4979986 |
Rapid oxidation process of carbonaceous and pyritic gold-bearing ores by chlorination
A method of treating a gold-bearing ore to render the gold component of the ore more amenable to standard cyanidation treatment in a reduced amount of time is disclosed. An aqueous slurry of the...
|
|
|
4971662 |
Hydrometallurgical recovery of metal values from cooper containing sulphide materials
A process for the hydrometallurgical recovery of metal value, particularly copper, from copper-containing sulphide materials in which the material is conventionally ground and reacted with a...
|
|
|
4956154 |
Selective removal of chromium, nickel, cobalt, copper and lead cations from aqueous effluent solutions
Aqueous effluent solutions containing metal cations may be treated with an extractant comprising an organophosphinic acid, a di-2-ethylhexyl phosphoric acid and/or an aliphatic amine to selectively...
|
|
|
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.
|
|
|
4936910 |
Process for the recovery of gold
Process for recovering gold from a leachate containing AuBr4-- comprising contacting the leachate with a quantity of sphagnum peat moss under conditions effective to concentrate the gold on the...
|
|
|
4923686 |
Process for the extraction of metal values
Metal values are extracted from aqueous solutions of metal salts containing halide or pseudo halide ions by pyridine derivatives containing the substituent --(COX)A where X is the group --OR1 or...
|
|
|
4915730 |
Process and apparatus for recovery of flue dust
A process and apparatus for the recovery of metals such as silver from phosphate flue dust. The process includes the steps of blending chloride salt and the flue dust to produce a blended material,...
|
|
|
4906293 |
Hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules
An improved hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules. The process includes the steps of contacting the ferromanganese nodules in an extraction zone...
|
|
|
4902344 |
Ferric chloride leach of a metal-sulphide bearing material
The present invention relates to an aqueous ferric chloride leach process for the extraction of metal values from a metal-sulphide bearing material, the leach being carried out in the presence of a...
|