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Matches 701 - 750 out of 3,171

Document Document Title
WO/2002/028529A2
Ion exchange resins composed of a polymeric matrix functionalized with a piperazine group are suitable for separating gold cyanide from aqueous medium containing gold cyanide complex and other metal cyanide complexes in a process wherein...  
WO/2002/022899A2
Reducing the level of base metal species during the cyanide extraction of gold and silver from their ores by treating an aqueous slurry of the ores with a water-soluble sequestering agent for the base metal species for a time sufficient ...  
WO/2002/020451A1
A method of recovering metal values from an ion exchange resin to which a metal species is bound comprising contacting the reaction product stream with a basic ion exchange resin such that at least a part of the metal becomes bound to th...  
WO/2002/020857A1
A method for producing a silver having high purity from a raw material of low grade, characterized in that it comprises dissolving the raw material with a nitric acid solution, adding hydrochloric acid to the resulting mixture to give si...  
WO/2002/018663A2
The invention provides a process for the selective recovery of aluminium, cobalt and platinum, and compounds thereof, from a catalyst composition including aluminium, cobalt and platinum, said process including the steps of treating the ...  
WO/2002/008474A2
The present invention relates generally to a process for the production of sulfuric acid and liberation of metal values such as copper and precious metals from materials containing sulfur through pressure leaching operations. In accordan...  
WO/2002/004919A2
The invention provides a method of assaying a mineral sample for determining the concentration of selected metals in a sample comprising the steps of providing a comminuted mineral sample; mixing such sample with a flux; preheating a rea...  
WO/2002/000951A1
A method for producing a platinum material reinforced with dispersed oxide, which comprises adding powdered platinum into water to prepare a platinum suspension, admixing the platinum dispersion with a zirconium nitrate solution and a ur...  
WO/2001/098548A2
The invention relates to a chromatographic method for interseparating platinum group metals from a feed solution, wherein the feed solution is oxidated prior to the chromatographic separation to reach a redox-potential of at least 900 mV...  
WO/2001/088211A2
The invention relates to a method for the treatment of work pieces with a palladium colloid solution by bringing the work pieces into contact with the colloid solution, palladium being recovered after the use of the colloid solution. Thi...  
WO/2001/088212A2
Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relativel...  
WO/2001/083834A1
A supercritical oxidation process carried out in water is capable of oxidising "organics" in precious metal organic compositions such as heterogeneous (Pt/C) or homogeneous precious metal catalysts and producing a precious metal oxide wi...  
WO/2001/083835A2
A process for recovering gold from a concentrate such as electrolytic sludge, a zinc-gold precipitate, general gold scrap or a gravity concentrate. The concentrate is leached in HCl solution with gaseous chlorine to dissolve the gold and...  
WO/2001/077011A1
A new method of creating thin free-standing pin hole-free hydrogen-selective palladium-bearing membranes that comprises thinning cold-rolled membranes by chemical etching or electrochemically electrolyzing of at least one membrane surfac...  
WO/2001/066811A1
Briefly stated, there is provided a method for reducing cyanide consumption in precious metals mining extraction processes involving a sulfur bearing ore body, comprising the steps of providing a precious metal bearing material having in...  
WO/2001/062993A1
Disclosed is a process for recovery of cyanide and metals from a liquor containing complexes of cyanide and metal typically generated by a metallurgical or industrial process. The process involves electrochemical dissociation of the meta...  
WO/2001/056932A1
The invention relates to a method for separating and recovering rhodium from reaction products of oxosynthesis, especially reaction products containing cobalt. The invention also relates to the reuse of rhodium as a catalyst for hydrofor...  
WO/2001/055462A1
The present invention concerns a process for refining silver bullion, i.e. raw silver containing generally more than 90 % silver besides Se, Pb, Au, Cu and platinum group metals (PGM) as main impurities. The process comprises the steps o...  
WO/2001/049889A1
This invention provides a method to control the off gas emission of sulfur dioxide from a mineral ore roaster by grinding a sulfur-containing mineral ore, adding sodium sesquicarbonate to the mineral ore, and roasting the ore and sodium ...  
WO/2001/042519A1
A process for leaching precious metals from material containing precious metals, such as oxidic and sulfidic gold-bearing ores, is disclosed. The process includes the steps of: (i) leaching the precious metal with a leach solution contai...  
WO/2001/042531A1
A component is made of or coated with a refractory material for use at high temperature, e.g. in an aluminium production cell, an arc furnace or an apparatus for treating molten metal. The refractory material comprises particles of a ref...  
WO/2001/042168A1
An aluminium-wettable protective coating on a substrate, for use at elevated temperature in an oxidising and/or corrosive gaseous and/or molten environment is disclosed. The coating (20A, 20B, 20C, 20D) is applied to protect the substrat...  
WO/2001/029275A1
The present invention, therefore, provides stage crushing method for recovering precious metals from slag produced by a coal burning furnace or boiler comprising: a plurality of crushing steps, wherein each crushing step produces slag pa...  
WO/2001/023067A1
Compositions and methods for selectively binding metal ions from source solutions are disclosed. The compositions include 1) polyamide-containing ligands covalently bonded to a particulate solid support, and 2) polyamide-containing polym...  
WO/2001/018262A2
A method of bioleaching a slurry containing sulphide minerals which includes the step of supplying a feed gas containing in excess of 21% oxygen by volume, to the slurry, increases the rate of oxygen transfer from the gas to the liquid p...  
WO/2001/018266A1
A method of recovering zinc from a zinc bearing sulphide mineral slurry which includes the steps of subjecting the slurry to a bioleaching process, supplying a feed gas which contains in excess of 21% oxygen by volume, to the slurry, and...  
WO/2001/018267A1
A method of recovering a precious metal from a sulphide mineral slurry which contains the precious metal which includes the steps of subjecting the slurry to a bioleaching process, supplying a feed gas which contains in excess of 21% oxy...  
WO/2001/018268A1
A method of recovering nickel from a nickel bearing sulphide mineral slurry which includes the steps of subjecting the slurry to a bioleaching process, supplying a feed gas which contains in excess of 21 % oxygen by volume, to the slurry...  
WO/2001/018602A1
This invention concerns the developing of silver halide photographic products. Silver-laden slurries accumulate in developing baths. Its is possible eliminate these silver-laden slurries by placing the developing baths in contact with al...  
WO/2001/018263A1
A method of oxidising a slurry containing solid reactants which includes the step of supplying a feed gas containing in excess of 21 % oxygen by volume, to the slurry. Preferably the feed gas contains more than 85 % oxygen by volume. The...  
WO/2001/018269A1
A method of recovering copper from a copper bearing sulphide mineral which includes the steps of subjecting the slurry to a bioleaching process, supplying a feed gas which contains in excess of 21 % oxygen by volume, to the slurry, and r...  
WO/2001/016383A2
A process is disclosed for extracting a first metal from a material containing said first metal, including the step of treating said material with an aqueous alkaline solution containing an oxidising agent and complexes of ions of one or...  
WO/2001/011094A1
A foraminate element for recovery of platinum and/or palladium and/or rhodium lost from a platinum and/or palladium and/or rhodium-containing catalyst comprising a substrate containing palladium or a palladium alloy thereon in a thicknes...  
WO/2001/009398A1
The invention relates to an apparatus for the heating of flowing material containing finely divided solids, such as concentrate slurry containing precious metals and/or precious minerals, up to a desired temperature range, for instance t...  
WO2000065111B1
A method for recovering a precious metal from a host material, comprises the steps of subjecting the host material to an oxidative pressure leach process, in the presence of a halide ion constituent, preferably a chloride ion, which is r...  
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...  
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...  
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 ...  
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...  
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...  
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 ...  
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 ...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  

Matches 701 - 750 out of 3,171