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Matches 601 - 650 out of 3,778

Document Document Title
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...  
WO/1996/017096A1
Provided is a process for treating refractory precious metal-containing ores, particularly gold-bearing ores, to reduce the ability of organic carbon to interfere with recovery of the precious metal. The ore may also contain sulfide mate...  
WO/1996/012826A1
A method for improving the heap biooxidation rate of refractory sulfide ore particles that are at least partially biooxidized using a recycled bioleachate off solution is provided. The method includes the steps of biooxidizing a heap (10...  
WO/1996/009417A1
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 fluoroaliphatic surfactants.  
WO/1996/000801A1
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 process utilizes sodium bromide, sodium...  
WO/1995/031577A1
A process for recovering gold and silver from complex ores of pyrite and arsenopyrite. The process involves the smelting of pyrite, obtaining molten pyrrhotite, contacting a layer of molten pyrrhotite containing a quantity of precious me...  
WO/1995/027085A1
A process for the extraction of palladium from an aqueous medium containing palladium and halide or pseudo-halide ions using as extractant a nitrogen-containing heterocyclic carbonamide or ester characterised in that the total concentrat...  
WO/1995/026418A1
A hydrometallurgical process for treating copper ores or concentrates containing gold by simultaneously leaching both copper and gold into an aqueous cyanide solution, recovering copper and gold in metallic form by electrowinning or ceme...  
WO/1995/018870A1
A method and an apparatus for recovering platinum group metals from a metal catalyst are disclosed, in order to separate the substrate containing the metal catalyst from the carrier, the sheets of the catalyst package are unwound. The sh...  
WO/1995/015403A1
A method of recovering precious metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from a crushed refractory sulfide ore (12, 24), forming a heap from the refractory sulfide...  
WO/1995/012001A1
Refractory ore is crushed (2) conveyed to a pug mill mixer (6) and mixed with sulfuric acid. Nitric acid is then added to the ore in a second pug mill mixer (12) and a third mixer (20). The ore is then conveyed to a curing/oxidation rota...  
WO/1995/011319A1
An improved process for dissolving gold metal in ligand and oxidant lixiviation systems, wherein the solubility of gold is enhanced by the addition of heterocyclic aromatic compounds containing nitrogen or sulfur in the ring.  
WO/1995/010636A1
Palladium catalyst is recovered from an organic solution by extraction with water/base solution. The water/base solution is then neutralized, and the palladium extracted with an organic solvent. The tramp metals remain in the water phase.  
WO/1995/008651A1
A powerful reducing agent such as hydrazine monohydrate is added to standard elution solutions such as NaOH-NaCN solutions with or without alcohol, thereby substantially increasing the elution kinetics of gold and silver.  
WO/1995/006141A1
Complex ores of the precious metals which also contain iron spinels and similar compounds are assayed and their precious metals content is extracted by subjecting the ores or concentrates thereof together with an iron-embrittling agent t...  
WO/1995/004164A1
A hydrometallurgical process for the recovery of precious metal values from refractory precious metal ore materials containing organic carbonaceous matter in which solubilized gold complexes are absorbed by leaching the ore with a thiosu...  
WO/1994/025633A1
A method of dissolving and, if necessary, further recovering noble metals efficiently from industrial raw materials including gold plated materials such as waste electronic parts, platinum catalysts used in the petrochemical industry, an...  
WO/1994/021345A1
Toxic cyanide and anionic metal species are removed from aqueous alkaline solutions by contacting the aqueous alkaline solutions with a compound which is capable of being protonated at a pH of 9 or above.  
WO/1994/019500A1
The present invention relates to the recovery of zinc values from an acidic solution containing hydrocyanic acid. The zinc is recovered as complex zinc cyanide anions which may, if desired, be recycled for the (selective) preliminary rem...  

Matches 601 - 650 out of 3,778