Login| Sign Up| Help| Contact|

Patent Searching and Data


Matches 601 - 650 out of 3,861

Document Document Title
WO/1999/060178A1
A hydrometallurgical treatment process for extracting platinum group metals from a flotation concentrate in which the invention revolves around obviating the matte smelting and granulating process. Instead the concentrate is submitted to...  
WO/1999/054515A1
A wear-resistant flash tank pressure let down nozzle for use in passing an ore slurry into an ore slurry flash tank to release steam from the slurry and reduce the pressure of the slurry. The nozzle has an expansion cone flaring toward t...  
WO/1999/050465A1
A process for the selective recovery of precious metals from a medium loaded with precious metals and base metals. The selective recovery of precious metals is achieved by exposing the medium to an aqueous solution containing a complex o...  
WO/1999/050187A1
A process for reducing boron and/or fluoride ion content of water. Feed water is contacted, in the presence of magnesium, with an alkaline hydroxide to produce treated water and a magnesium precipitate containing boron and fluorine. The ...  
WO/1999/047714A1
Apparatus and method for continuously separating a dense valuable material such as gold from a feed including a grinding mill (2) which directs a crushed feed through hydrocyclones (9) for separation into a light and dense fraction. The ...  
WO/1999/045158A1
The present invention relates to a gold recovery process, in particular a process for recovering gold values from carbonaceous materials having gold adsorbed thereon. A process for the recovery of gold from carbonaceous materials compris...  
WO/1999/045159A1
A process for extracting at least one valuable metal from starting material comprising a plurality of metallic compounds including (i) said at least one valuable metal and/or compound thereof, (ii) oxide of at least one other metal, and ...  
WO/1999/036582A1
The present invention relates to a method for processing pyrite minerals, using a microwave energized fluidizing reactor, under temperature conditions that provide reaction products that are relatively free of SO¿2? emissions. The tempe...  
WO/1999/032675A1
A method for obtaining complex zinc cyanide anions from a precipitate comprising zinc hydroxide and calcium sulfate. The method comprises subjecting such a precipitate to a zinc leaching step comprising contacting the precipitate with ca...  
WO/1999/031286A1
Metals are rendered analyzable, extractable or recoverable from materials, such as complex or refractory ores, by applying shear deformation forces to the materials. The shear deformation forces are generated by methods such as mechanica...  
WO/1999/028286A1
Process to separate rhodium from an organic starting mixture comprising of an organic solvent, C¿6?-dicarboxylic acids and iodide compounds, wherein rhodium is separated by extracting the organic starting mixture with an aqueous solvent...  
WO/1999/022036A1
The invention relates to a method for opening up materials containing noble metals, especially metallurgic primary concentrates. The materials are subjected to halogenation at a high temperature using gaseous processing media, gold and t...  
WO/1999/015276A1
A modular and transportable processing plant for recovery of metal values, comprising a crushing stage which comprises a primary dry crushing stage (13), a screening stage (15) included after the primary crushing stage (13) to separate o...  
WO/1999/014385A1
A hydrochloric acid solution containing platinum group metals has its acidity adjusted to 5.5 to 6.5M HC1 and its redox potential adjusted to at least 500mV, before being treated by chromatography. Particularly clean separation of at lea...  
WO/1999/013116A1
Processes for the recovery of gold and/or silver from lixiviant solutions include a preliminary step of: (a) contacting the lixiviant solution with ion exchange resins containing amine functionality, optionally dispersed or distributed w...  
WO/1999/013115A1
The invention relates to a method for reprocessing materials containing precious metals especially from metallurgic primary concentrates in which the materials are subjected to an increased temperature in the sequence of an oxidized trea...  
WO/1999/010625A1
A placer gold separating method comprising subjecting placer gold- and gold ore-containing sand and gravel layers accumulated on the bottom of the water of a river and placer gold- and gold ore-containing sand and gravel layers formed de...  
WO/1998/059081A1
The invention concerns a method for separating metal ions absorbed on a resin consisting in: suspending or percolating the cationic exchange resin charged with a polar solvent containing an eluting agent or a mixture of eluting agents co...  
WO/1998/058089A1
A method for smelting a noble metal involving a silver treatment process comprising the steps of leaching crude silver with nitric acid, purifying the leachate, electrolyzing silver, and recirculating the liquid after the electrolysis. I...  
WO/1998/058092A1
The invention relates to precious metal recovery from solutions at both high and low content of the metal being recovered in the solution. The essence of the method consists in that in technological process including mixing of the initia...  
WO/1998/056494A1
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 (134) containing most of the multivalent meta...  
WO/1998/051827A1
A metal-containing refractory sulfide ore (12) is split into a first portion (16) and a second portion (18). The first portion (16) is partially biodigested by a sulfide-digesting microorganism in a biooxidation reactor (20) where the mi...  
WO/1998/050592A1
An in-situ reactor with hydrologic cells is provided to facilitate recovery of metals such as gold from rocks, or purification of salts such as potassium or magnesium chloride formed by evaporation of brines, by injecting into a source a...  
WO/1998/045488A1
The present invention relates to chemistry and is intended mainly for extracting by sorption platine group metals from the surface of parts and instrumentation such as used as catalysts by plants. The inventive surface treatment method c...  
WO/1998/042894A1
The invention concerns an electrolytic method for selectively recovering and recycling silver from a nitric solution containing same in the form of Ag(I). The method consists in successive steps of electrolytic deposition of silver in th...  
WO/1998/041328A1
The invention relates to a fibre-optic Sagnac interferometer, especially for determining rotation speeds (fibre optical gyroscope), comprising a light source (1) which is connected by an optical waveguide (9) to an input of an optical di...  
WO/1998/030656A1
A method of removing reactive metal from a metal-coated reactor system, comprising contacting at least a portion of a metal-coated reactor system containing reactive metal with a getter to produce movable metal, and fixating the movable ...  
WO/1998/017395A1
A method is disclosed for processing a gold-bearing refractory sulfide ore (102) by maintaining the ore in a substantially oxygen free environment, preferably beginning with comminution (104) of the ore and ending after a desired final c...  
WO/1998/008989A1
The present invention relates to a method for processing pyrite minerals, using a microwave energized fluidizing reactor, under temperature conditions that provide reaction products that are relatively free of SO�2? emissions. The cont...  
WO/1998/006878A1
A process for obtaining access to refractory gold and/or silver carried by arsenopyrites and/or arsenical pyrites comprises first heating dry ore concentrate containing arsenopyrites and/or arsenical pyrites at a temperature from 450 �...  
WO/1997/049474A1
The process of recovering precious metal from ores containing precious metals, such as gold and silver, from an aqueous ammoniacal thiosulfate leach solution to provide a significant practical and economical process for the recovery of g...  
WO/1997/040198A1
This invention pertains to a method for extracting gold from poor auriferous sands and other materials. The sand is moistened with alkaline water, following which it is crushed and ground so that the gold particles are released from the ...  
WO/1997/030377A1
A process for regenerating spent fixer solution which includes the steps of adding finely particulate zinc, such as zinc dust, to the solution to cause silver dissolved therein to precipitate and removing the precipitate from the solutio...  
WO/1997/021842A1
Thermal treatment of refractory gold ores takes place in an oxidizing atmosphere as fuel is added. Water or steam is introduced to reduce emission of nitric oxide and sulphur dioxide into the atmosphere.  
WO/1997/014818A1
Process for extracting gold from mineral suspension includes at least one stage of flotation using the flotoreagents, following which the microorganism culture in an amount between 10.0 to 30.0 grams per ton is introduced into the flotat...  
WO/1997/013881A1
The invention relates to a method for treatment of waste products that contain organic materials, such as plastic and like organic materials, and frequently also containing metal values, including precious metals, by thermal processing, ...  
WO/1997/011202A1
The invention pertains to the metallurgy of non-ferrous and precious metals, more specifically, to a process for the hydrometallurgical extraction of precious metals from raw material that is difficult to process. The raw material matrix...  
WO/1997/010367A1
Recovery of gold from alkaline cyanide leach solutions using ion exchange adsorbents, comprising (a) contacting the cyanide leach solution containing the gold with an extraction reagent comprised of a solid adsorbent carrying an organic ...  
WO/1997/007250A1
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 a solution of an oxidizing gas dissolve...  
WO/1997/006282A1
A processing method for the recovery of noble metals such as platinum, rhodium and palladium contained in various compositions comprising a layer of oxide(s) on a metal carrier, particularly used or spent post combustion catalysts for mo...  
WO/1997/005294A1
The present invention is a method of increasing the gold content of metallic gold comprising the step of exposing the metallic gold composition to a leach liquor. The leach liquor is selected to dissolve the impurities from the metallic ...  
WO1996041029A3  
WO/1996/041029A2
A process for the extraction of Ni/Co values from an ore or concentrate comprises the steps of subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containing halide, copper and sulphat...  
WO/1996/041026A1
A process for the extraction of a metal from an ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containig halogen ions and a source of bisulphate or su...  
WO/1996/041027A1
A process for the extraction of a metal from an ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containing halogen ions and a source of bisulphate or s...  
WO/1996/038381A1
A method of biotreating a solid material to remove an undesired compound using a nonstirred surface bioreactor is provided. According to the method, the surface of a plurality of coarse substrates is coated with a solid material to be bi...  
WO/1996/034121A1
The invention is a method of treating intractable gold- and silver-containing materials, ores and concentrates without the use of cyanide and based on hydrometallurgical processing of the crushed material using mineral acids, thereby pro...  
WO/1996/033146A1
Provided is a method for processing a gold-bearing sulfide ore (102) which involves maintaining the ore in a substantially oxygen-free environment, preferably beginning with comminution of the ore and ending when a desired final concentr...  
WO/1996/029439A1
The present invention relates to a method of processing a sulphide mineral composition which at least partly comprises an iron containing mineral, the method comprising the steps of: (a) milling said composition to a particle size P80 of...  
WO/1996/017097A1
A device has a reactor vessel (1) with an inlet (7) and an outlet (5) for the processing medium. The material (9) to be processed and a holder (10) for said material (9) are located inside the reactor vessel (1). The holder (10) has a de...  

Matches 601 - 650 out of 3,861