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Matches 351 - 400 out of 1,882

Document Document Title
WO/2001/088212
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/2001/083835
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/2001/083834
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/2001/077011
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/2001/066811
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/2001/062993
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/2001/056932
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/2001/055462
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/2001/049889
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/2001/042531
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/2001/042519
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/2001/042168
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/2001/029275
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/2001/023067
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/2001/018266
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/2001/018263
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/2001/018602
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/2001/018267
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/2001/018269
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/2001/018262
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/2001/018268
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/2001/016383
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/2001/016383
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/2001/011094
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/2001/009398
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...  
WO/2000/075383
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/2000/068446
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/2000/065112
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/2000/065111
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/2000/063630
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/2000/061494
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/2000/061824
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/2000/050651
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/2000/050653
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/2000/047556
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/2000/045960
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/2000/043558
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/2000/039350
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/2000/036165
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/2000/036166
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/2000/023191
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...  
WO/2000/016904
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...  
WO/2000/015856
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...  
WO/2000/009770
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...  
WO/2000/009771
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...  
WO/2000/009915
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...  
WO/1999/063123
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...  
WO/1999/060178
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...  
WO/1999/054515
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...  
WO/1999/050465
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...  

Matches 351 - 400 out of 1,882