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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.
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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...
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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, ...
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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...
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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 ...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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.
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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.
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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...
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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...
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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...
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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.
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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...
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WO/1994/006944A1 |
A method for recovering precious metals from carbonaceous ore comprising leaching the ore with a lixiviant solution and then preg-robbingly concentrating the precious metal-lixiviant complexes in solution on to the native carbonaceous co...
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WO/1994/003649A1 |
A process for leaching platinum and palladium wherein an aqueous leaching solution containing bromine and bromide ion contacts a precious metal source to produce an aqueous leachate. A precursor composition for producing an aqueous leach...
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WO/1994/000608A1 |
A method of treating a solid material (1) containing a substance of economic importance to recover or extract the substance from the material, characterised in that the method comprises forming a conducting mixture of the solid with a fl...
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WO/1994/000606A1 |
A process for producing one or more metals from a mineral feedstock (12) is defined. The mineral is fed to a leaching apparatus (10) wherein it is contacted with electrolyte (14). The leaching apparatus has zones of decreasing oxidation ...
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WO/1993/019212A2 |
An improved process for recovery of precious metals such as gold or silver using novel ion exchnage resins having aryl guanidyl functionality from aryl guanidine compounds having a pKa at 25°C less than 13 and preferably less than 12. T...
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WO/1993/018190A1 |
The binder composition for agglomerating ore fines of the invention is a mixture of (1) a reactive calcareous component, (2) a reactive siliceous and aluminous component, and (3) a sulfate compound. Preferably, the binder composition is ...
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WO/1993/014231A1 |
A process for recycling hydrogen cyanide from a cyanide-containing slurry (24) is provided. The process includes the steps of adjusting the pH (28) of a cyanide-containing slurry, volatilizing HCN (30) contained in the pH adjusted slurry...
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WO/1993/007980A1 |
A reductive process for making finely divided silver particles in which the silver particles are precipitated from an aqueous acid solution of silver salt containing silica sol.
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WO/1993/008310A1 |
A process suitable for the extraction or recovery of metal values from arsenic containing feeds and including the steps of: a) treating the feed with a nitric acid-containing leachant solution in order to dissolve the desired metals; b) ...
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WO/1993/000610A1 |
A process for treating a photographic developer solution containing silver ion comprises contacting the solution with a silver recovery element (10), which comprises a substrate (12) having thereon a hydrophilic colloid layer (16) contai...
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WO/1993/000611A1 |
An element and a process for recovering silver from a photographic developer solution containing silver ions. The silver recovery element (10) comprises a support (12) having a hydrophilic colloid layer (16) containing physical developme...
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WO/1992/022674A1 |
A method for the recovery of platinum and rhodium lost from a platinum-containing catalyst during ammonia oxidation processes at a temperature above 850 �C. Lost precious metal is brought into contact with a foraminate element fabricat...
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WO/1992/022673A1 |
The invention relates to a process for the treatment of complex metal sulphide materials and for the recovery of metal values from such materials. The process is characterized by first subjecting the material to a leaching process under ...
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WO/1992/021419A1 |
A method for the removal, separation, and concentration of Rh, Ir, and/or Ru from a source solution which may contain larger concentrations of other ions including H+ comprises bringing the source solution into contact with a compound co...
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WO/1992/019779A1 |
Disclosed is an oxidative process for recovering rhodium catalyst values from ''tars'' formed during the preparation of acetic anhydride by the rhodium catalyzed carbonylation of a mixture of methyl iodide and methyl acetate and/or dimet...
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WO/1992/018655A1 |
A method for extraction of gold and silver from a mineral raw material provides for sorption leaching of the pulped raw material in a cascade of installations and subsequent multi-stage desorption of gold, silver and admixtures from a sa...
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