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WO/1992/018654A1 |
An ion flotation process for the recovery of cyanides of metals including gold, platinum and palladium from a feed solution (10) is performed in an ion flotation vessel (12) using a selective surfactant (14) such as cetyltrimethylammoniu...
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WO/1992/018249A1 |
A process for recovery of a valuable species in an ore that contains constituents of absorbed microwave energy is disclosed. In particular, a process for recovery of gold values from a gold bearing ore is disclosed. The process comprises...
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WO/1992/018422A1 |
This invention relates to compositions for the hydrometallurgical recovery of precious metals, and the use of certain of such compositions in other applications. The composition comprises: water, at least about 25 % by weight bromine, be...
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WO/1992/012779A1 |
An improved process for stripping gold cyanide from activated carbon is disclosed. The process involves contact of gold-laden activated carbon with a strong base at ambient temperatures followed by elution with an aqueous solution contai...
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WO/1992/008812A1 |
A recovery method for base metal values (e.g. copper) from ore slurry or aqueous solution, comprising forming a solution of a metal complex (e.g. cyano-copper) having an affinity for adsorption sites on activated carbon, adsorbing the me...
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WO/1991/013177A1 |
A process for the hydrometallurgical recovery of gold from gold-bearing material comprising the step of treating gold-bearing material with an acidic lixiviant solution containing thiourea and ferric ions, characterized in that the said ...
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WO/1991/011539A1 |
A process is described for the recovery of gold from gold-loaded thiosulphate solution. The solution is treated with at least a stoichiometric amount of cyanide ions and the resultant gold complex is adsorbed by an adsorbent, such as car...
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WO/1991/009145A2 |
Waste liquors containing small amounts of silver salts are treated with aluminum hydroxide to produce a floc reduced in volume by the addition of an acid and mixed with a metal bicarbonate and metal carbonate in amounts sufficient to aff...
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WO/1991/008316A1 |
A variety of processes for recovering gold from gold ore are disclosed. Briefly, the methods include culturing at least one microorganism species capable of producing cyanide ion under conditions wherein the microorganism produces cyanid...
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WO/1991/005882A1 |
A process is disclosed for recovering silver sulfide from a spent photographic fixer solution, which contains silver. The process is particularly suited for treating the fixer solution in a manner which enables recycling of the solution ...
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WO/1991/002097A1 |
A method for ion flotation in which the flotation reagent employed is a compound of general formula (I), wherein R?1� is a C�10? - C�18? alkyl group, Y is O, S, NH, (CH�2?)�n? or (CHR)�n? where R is a lower alkyl group and n ...
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WO/1990/015887A1 |
Platinum group metals are recovered from lower-grade ores than hitherto considered economic by lixiviation with aqueous arsenate or thiosulphate, plus halide, in air.
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WO/1990/013678A1 |
The invention concerns methods and an apparatus for extracting precious metals and harmful matter from materials such as slag. The methods include freezing the pre-sized material; exposing it to ultraviolet and infrared radiation; roasti...
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WO/1990/013676A1 |
The recovery of noble metals by sodium cyanide leaching from complex refractory gold and silver bearing ores containing such complex silver sulphides as polybasite, pearcite, pyrargyrite, tetrahedrite and argentite presents difficulties ...
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WO/1990/012898A1 |
A method of recovering silver from used photographic fixer solutions characterised in that the solution contains an alkali metal sulphite as the sole silver halide solvent.
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WO/1990/012119A1 |
A method for ion flotation, especially in the extraction of gold uses as the flotation reagent a cationic surfactant of formula (I), wherein R?1¿ is a C¿10? - C¿18? alkyl group, R?3¿ is a lower alkyl group, or benzene ring optionally...
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WO/1990/010721A1 |
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, thiourea, chlorine and aqua regia and optiona...
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WO/1990/009460A1 |
A process for the recovery of precious metal values as essentially pure gold from gold alloys in the form of thin strips 0.05 to 0.25 inch thick having a gold content of up to 80 % gold comprising chlorinating the strips at a temperature...
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WO/1990/009246A1 |
An air concentrator for dry separation of gold and other heavy minerals from alluvial deposits comprises a housing (50) having a number of open-topped chambers (52) arranged in a ring-like configuration and surmounted by a screen (14) ha...
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WO/1990/007979A1 |
A process and apparatus for regenerating granules of carbon used in the recovery of gold from ores by cyanidation treatment. The process comprises heating the granules in a kiln by means of microwave energy to a temperature sufficient to...
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WO/1990/005114A1 |
A process for the neutralization, clarification and decolorization of organosilanes or organosilicones derived from the reaction of an organosilane or a hydropolysiloxane with an aliphatically unsaturated compound in the presence of an a...
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WO/1990/004655A1 |
A process for removing and recovering cyanide from a cyanide-containing mixture. A cyanide-containing waste stream (12) is treated in a pH adjustment zone (14) by addition of acidifying agent (16) in order to obtain a stream having a pH ...
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WO/1990/000206A1 |
The invention relates to the field of sewage treatment and production of noble metals by the cyanide process. A method of treating cyanide pulp consists in mixing the cyanide pulp with formaldehyde while constantly controlling and mainta...
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WO/1989/012699A1 |
A process for extracting gold from copper, antimony, bismuth, arsenic and iron bearing mineral sulphides by reacting the finely divided sulphide mineral with an aqueous ferric chloride/chlorine solution and free chlorine gas in a closed ...
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WO/1989/009837A1 |
A noble metal recovery process using counter current contact of a flow of slurry with a flow of mercury in droplet form which mercury is collected and filtered to remove amalgams for recovery of noble metals. An electric charge may be ap...
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WO/1988/006193A1 |
A system for recovering precious metal particles from a slurried soiled material by amalgamation comprises an amalgamating apparatus (3) through which a soil material is circulated with the soil material in slurry form and submersed in a...
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WO/1988/006192A1 |
A process for recovering Platinum Group metals from material comprising one or more Platinum Group metals and one or more Group IA metals supported on carbon comprises heating at a temperature between 700°C and 1150°C in a stream of an...
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WO/1988/004476A1 |
For the recycling of electrical batteries, in particular of a mixture of high-power batteries for equipment of any chemical composition, and also of assembled printed circuit boards and electronic components, a pyrolysis of the unsorted ...
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WO/1987/006271A1 |
A leaching and/or adsorption system for gold extraction in a carbon in pulp gold recovery process. The system (11, 13) includes a bed (15) having a series of longitudinal channels (17) each provided with sparge pipes along the base there...
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WO/1987/005052A1 |
A process for the recovery of metal as an oxide from a material in which the metal is present in the form of finely divided particles on an inert carrier substance dispersed in an organic substance, wherein said material is fed in a liqu...
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WO/1987/003623A1 |
An improved process for recovering gold from gold-containing materials by iodide/iodine leaching wherein the pregnant lixiviant containing solubilized gold and iodine is treated in an electrolytic cell to reduce gold in solution to eleme...
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WO/1987/002068A1 |
The mixture of sulfides is chemically attacked with an aqueous oxidizing solution of fluosilicic acid for dissolving the metals present. From said solution, the lead, and optionally the silver, is reprecipitated to the state of sulfates ...
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WO/1987/001732A1 |
A method of refining a precious metal comprising the steps of inquarting the material containing the precious metal into an alloy, with a known quantity of a base metal to form an alloy of a known concentration of the precious metal, and...
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WO/1987/001733A1 |
Wet chemical process for extracting gold and silver by direct oxidizing, sulphuric acid disintegration of carbon-containing arsenopyrite (FeAsS2) concentrates containing silicate gangue or silicate and pyritic gangue, in which arsenic an...
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WO/1987/001366A1 |
Gold sand resulting from the nitric acid treatment of silver refinery slimes is purified by washing with hydrochloric acid under controlled operating conditions. Platinum and other precious metals and impurities are selectively separated...
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WO/1987/001139A1 |
A process for extracting a precious metal or base metal from a source material containing the metal. The process comprises contacting the source material with an aqueous leaching solution containing a leaching agent comprising an N-haloy...
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WO/1987/000677A1 |
An electrically conductive polythiophene or substituted polythiophene, a procedure for its manufacturing and its use. The electrically conductive polythiophene or substituted polythiophene has been doped or treated with FeCl3 or with com...
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WO/1986/006750A1 |
A process for the recovery of noble metals from a catalyst-tar formed in a process in which acetic anhydride is prepared by carbonylating methyl acetate in the presence of a noble metal containing catalyst such as rhodium, lithium and me...
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WO/1986/006361A1 |
Preparation of metal carbides, nitrides, borides, silicides and phosphides, also metal alloys and pure metals, by providing a precursor in which there are organic ligands bonded to the metal or metals, such precursor having the element X...
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WO/1986/000820A1 |
The chelating compounds useful in the invention comprise the condensation product, as well as derivatives thereof, of two equivalents of a trimethyl cyclohexane-anhydride acid chloride derivative with one equivalent of an aromatic diamin...
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WO/1985/000834A1 |
Process for the recovery of non ferrous and precious metals from carbon-containing materials particularly coking products by using a thermal process. A carbon-containing material having a certain content of non ferrous and/or precious me...
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WO/1985/000384A1 |
Reagent suitable for the dissolution of metallic gold and various methods for the application of the reagent including gold analysis, gold extraction, gold separation and the in-situ treatment of gold deposits. The reagent comprises a pr...
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WO/1984/004259A1 |
Gold ore, or any other mineral treated to have a lyophilic surface, (e.g. chalcopyrites), is ground into a slurry in crusher (1), powdered coal and oil are added at location (2), and the mix is conveyed to a contact zone (3), where any m...
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WO/1984/002148A1 |
A process for recovering precious metals from an alkaline cyanide process liquor containing a base metal component. The liquor is treated with precipitant for at least one base metal of said component, the precipitant being selected from...
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WO/1984/000563A1 |
Process for the dissolution of silver and gold from ores and concentrates in a strong chloride solution where the Eh is maintained above a value of 750 m.v. and preferably above a value of 850 m.v. This process may include the additional...
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WO/1983/000630A1 |
A process for recovering silver and photosensitive material base in a reusable form from a photosensitive material such as film or photographic paper having on its surface a gelatin membrane containing fine silver crystals by decomposing...
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WO/1982/001195A1 |
Silver and/or gold (12) are recovered from ores or concentrates (1) by forming a mixture of the ore or concentrate (1) with electrolyte containing chloride ions (2) and maintaining the mixture at a temperature up to the boiling point of ...
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WO/1982/000478A1 |
Gold and silver, and their sulfides, selenides and tellurides are oxidized with water miscible dipolar aprotic solvents containing bromides and/or chlorides and as oxidant cupric and/or ferric ions. This oxidation reaction is used to rec...
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WO/1981/002688A1 |
A stable suspension of particles of a metal belonging to the platinum group consists of a microemulsion in which the particles are suspended. The suspension is prepared by dissolving a metal salt in a microemulsion, and reducing the salt...
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WO/1981/001159A1 |
Process and apparatus for recovery of hydrogen-reduced metals from aqueous salt solutions at a porous hydrophobic catalytic barrier (2). Previously, the prior art provided a diffusion barrier between a hydrogen anode and a cathode to pre...
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