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WO/2000/075383A1 |
Apparatus suitable for use in the recovery of gold from a source material containing gold sulphides, the apparatus including a heated retort for receiving the source material so as to separate it into a solids component and a volatiles c...
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WO/2000/068446A1 |
A leaching process for the recovery of gold from a gold containing ore is described in which a gold ore is lixiviated with an acid (pH 0.5-2.0) solution containing 1-15 g/l thiourea in the presence of an oxidising agent and a reducing ag...
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WO/2000/065112A1 |
The process of recovering precious metals 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 ...
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WO/2000/063630A1 |
An apparatus for treating, in particular purifying or degassing, molten metal (40), comprising a component (10) exposable to molten metal to be treated and means (13) for imparting a rotary motion to the molten metal (40) about a substan...
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WO/2000/061824A2 |
A process for recovering mineral particles, metal particles or small precious stones from an aqueous slime associated with an ore body or mineral deposit or processing thereof, said aqueous slime containing mineral particles, metal parti...
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WO/2000/061494A1 |
A sodium cyanide composition having a paste-like consistency is provided which comprises sodium cyanide, a base, water, and a rheology modifier. Also provided are processes for producing and using the composition. The composition can be ...
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WO/2000/050651A1 |
A metal-containing refractory ore (12), such as refractory sulfide ore, 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 ...
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WO/2000/050653A1 |
A method for the chemical precipitation of metallic silver powder employs a two solution technique in which a solution of a tin salt and a solution of a silver salt are mixed in the presence of an inorganic or organic acid, alumina, an a...
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WO/2000/047556A1 |
A substituted thiourea having general formula (1) characterised in that each of R?1¿ and R?2¿ independently comprises an alkyl, alkaryl or aryl group or a substituted derivative thereof, and contains at least one fluorine atom, and in ...
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WO/2000/045960A1 |
The present invention can be used in placers containing fine or thin gold particles as well as in the recycling of waste from the industrial processing of the rock mass. This method involves excluding from the low grade rock particles fr...
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WO/2000/043558A1 |
The invention provides a process for recovering hydrogen cyanide from an aqueous solution by extracting the hydrogen cyanide into an organic solvent phase. The organic solvent may comprise neutral organophosphorous compounds, such as com...
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WO/2000/039350A1 |
The invention relates to a method for extracting anions based on metals of the V group to the VII group of the periodic table from the aqueous solution thereof. To this end, compounds or general formula (I) are used as an extracting agen...
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WO/2000/036166A1 |
Method and equipment for the separation of gold particles and other sediment materials contained in clays, earth and slurries, consisting in diluting the latter in a sufficient quantity of water until the particles to be separated may dr...
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WO/2000/036165A2 |
The subject invention pertains to the use of non-toxic heavy liquids and slurries in the separation of components of ores, concentrates, residues, soils, and scrap. Specifically exemplified herein is the use of cesium and/or rubidium sal...
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WO/2000/023191A1 |
The process comprises a) introducing the noble metal in the form of sheets, foils or wafers inside a container provided with grinding means; b) adding into said container a liquid medium having a density comprised between 0.61 and 1,50 g...
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WO/2000/016904A1 |
A method of producing metal flakes by producing a highly porous sponge structure of the metal; comminuting the highly porous sponge structure into particles; and flattening the particles, in a medium free of an organic lubricant into fla...
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WO/2000/015856A1 |
A process for the extraction of gold and/or silver from gold and/or silver bearing ore particles or concentrates, said process including the stages of: A. filling a reaction vessel with said ore particles or concentrates, and B. circulat...
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WO/2000/009770A1 |
Process and apparatus for recovering metal material from waste material including organic material, such as plastic, and metal material in the form of thin foil material. The process includes following steps: (a) introducing the waste ma...
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WO/2000/009915A1 |
A screen assembly (11) intended to be received through an outlet (55) in a leach tank, for example in a CIP/CIL gold process, the outlet (55) characterised by being accessible from above for vertical extraction and insertion to a working...
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WO/2000/009771A1 |
Process and apparatus for recycling of liquid carton waste material or other similar waste material which includes fibrous material, metal and plastic material. The process including following steps: (a) introducing the waste material an...
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WO/2000/001863A2 |
The invention relates to a method for detaching precious metal layers from a correspondingly coated material by dissolving the precious metals in a salt-containing alkali cyanide solution containing oxidizing agents. According to the inv...
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WO/1999/063123A1 |
Methods and compositions for increasing the recovery of precious metals from ore during heap leaching operations are disclosed. The methods add polypropylene glycol and alkylphenol ethoxylate in a paraffin oil solvent with the cyanide li...
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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...
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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...
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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...
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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 ...
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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 ...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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WO/1998/048064A1 |
The invention relates to a device for cooling material chunks or grains, especially material consisting of multiple components, which are subsequently fed to a device for crushing said material, preferably on a selective basis. An exampl...
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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...
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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...
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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...
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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 ...
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