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Matches 201 - 250 out of 2,469

Document Document Title
WO/2001/055460A1
The invention relates to a method for reprocessing dust or dust mixtures containing alkalis and heavy metals such as e.g., steel works dust, ore dusts or blast furnace dust. According to said method, the dust is introduced onto or into a...  
WO/2001/048255A1
A method and apparatus for precipitating manganese from acidic sulfate solutions, and more specifically from zinc leach solutions, without removing zinc. A zinc- and manganese-containing solution is treated with an SO¿2?-O¿2? gas mixtu...  
WO/2001/044520A1
The invention relates to a process involving the following steps: a) performing leaching of the raw material with an acid aqueous solution to dissolve the zinc if said raw material is a solid; b) optionally performing solid-liquid separa...  
WO/2001/036693A2
A bio-leaching method is provided for recovering metal from a metal containing ore. The ore is subjected to contact with a microorganism selective to the oxidation of sulfur. A sulfur containing compound is mixed with the microorganism b...  
WO/2001/025497A1
The present invention relates to an apparatus and a process for producing zinc oxide from a zinc-bearing material. The process according to the present invention comprises the steps of leaching the complex sulfide material with hydrochlo...  
WO/2001/023627A1
A hydrometallurgical process utilizing an atmospheric calcium chloride leach to selectively recover from various metal feed stocks (consisting of elemental metals, metal oxides, metal ferrite, metal hydroxide, metal carbonates, metal sul...  
WO/2001/016383A3
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/2001/016384A1
The invention provides a hydrometallurgical process for treating metal-containing sulfide ores and concentrates, comprising reacting said metal-containing sulfide with concentrated sulfuric acid at a temperature of between about 300 °C ...  
WO/2001/012866A1
The present invention relates to a process of pyrometallurgy of zinc and a kind of closed furnace for zinc smelting. The technique is taken in a manner with an arc furnace right above a blast furnace. The arc furnace is used to decompose...  
WO2000050649A3
The present invention relates to a method and apparatus for separating undesired toxic metals, such as Zn, Pb and Cd, from iron-containing materials by: sintering a mixture of such materials (typically including EAF dust and mill scale) ...  
WO/2001/000355A1
Zinc-based metal foamed bodies containing, in addition to zinc and the usual impurities, 2-20 wt. % aluminium.  
WO/2000/061826A1
Disclosed herein is a process for removing at least a portion of a manganese constituent from a zinc-bearing material, comprising the step of subjecting the material to a first oxidation mixture of SO¿2? and oxygen, at conditions suffic...  
WO/2000/050652A1
A process for treating a metal sulphide concentrate which includes the steps of: a) roasting the concentrate to reduce the sulphide content of the concentrate, to a negligible value and b) melting the concentrate, under reducing conditio...  
WO/2000/050649A2
The present invention relates to a method and apparatus for separating undesired toxic metals, such as Zn, Pb and Cd, from iron-containing materials by: sintering a mixture of such materials (typically including EAF dust and mill scale) ...  
WO/2000/036167A1
A solvent extraction composition is provided which comprises one or more orthohydroxyarylaldoximes or orthohydroxyarylketoximes and one or more esters substituted with a hydroxyl group, and preferably a water immiscible organic solvent. ...  
WO/2000/031308A1
A cadmium- and zinc-hyperaccumulating subspecies from $i(Thlaspi caerulescens) and methods for removing and optionally recovering cadmium and zinc from soil using phytoextracting techniques wherein the subspecies is cultivated on soil co...  
WO/2000/020651A1
A device for removing dross from the surface of the molten metal and for extracting usable elemental metal from the dross. The device comprises a container in which the dross is collected, a means for lifting the container out of the mol...  
WO/2000/017404A1
The invention relates to a method for producing directly reduced metal in a multi-tiered furnace, whereby metal oxides and a reducing agent are inserted into the furnace and the process heat required for the reduction of the metal oxides...  
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...  
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...  
WO/2000/005424A1
The invention relates to a method for producing zinc using the IS process in an IS shaft furnace and to an IS shaft furnace for carrying out said method. To be able to utilize dust containing zinc in a simple manner the invention provide...  
WO/1999/066085A1
A process for the treatment of a roasted metal sulphide ore, for the separation of metals therefrom. The process comprises leaching the roasted ore with peroxysulphuric acid, optionally in the presence of chlorine, and separating a solut...  
WO/1999/063121A1
The invention relates to a method for recovering non-ferrous metals, particularly nickel, cobalt, copper, zinc, manganese and magnesium, from materials containing said metals by converting said non-ferrous metals into sulphates by means ...  
WO/1999/060177A1
The invention relates to a method for continuous separation of impurities and alloyings from liquid metal baths, e.g. iron-aluminum alloys, zinc oxides or mixed crystals from zinc baths, wherein liquid metal is extracted from the area cl...  
WO/1999/053108A1
The invention concerns a method for treating steel works dust in order to recuperate elements capable of being upgraded, said method comprising an attrition in water followed by hydraulic grading of the resulting load. Said method is cha...  
WO/1999/041418A1
A process and device are disclosed for precipitating solid compounds from the liquid zinc or liquid zinc-based alloys of a metal bath. According to the disclosed process, partial amounts of the metal phase containing the compound(s) are ...  
WO/1999/031285A1
The invention concerns a method for separating non-ferrous metals such as Zn and Pb from sludge containing iron, characterised in that it consists in the following operational steps: non-selective lixiviation of the iron-containing sludg...  
WO/1999/031014A1
A method for utilization of zinc byproducts in the manufacture of clear brine fluids comprising the step of mixing zinc feedstock containing metal impurities with a halogenic acid to produce an impure zinc halide solution. The metal impu...  
WO/1999/022037A1
The invention relates to a method for extracting non-ferrous metals, especially zinc, from raw materials containing metal by means of electrolysis using a technique which is known in itself. According to the inventive method, substances ...  
WO/1999/022035A1
A condensation chamber (32, 36) and method for condensing a metal connate from a metal rich gaseous mixture are disclosed. The condensation chamber (32, 36) includes top (38, 42) and sidewall surfaces (52, 54) that together define a cent...  
WO/1999/016917A1
The invention relates to a method and a device for separating zinc and/or cadmium from lead in a byproduct contaminated with said elements and/or compounds or in a residue arising during the production of metal. According to the inventio...  
WO/1999/010546A1
A process for the solvent extraction of metals, particularly copper, from aqueous ammoniacal solutions is provided. The extractant is an orthohydroxyarylketoxime of Formula (1), wherein R?1¿ is a hydrocarbyl group, and R?2¿ is an ortho...  
WO/1998/049105A1
A system and method for disposing of vacuum degasser contaminants which includes adjusting the pH, in a reactor vessel, of a vacuum degasser underflow stream to precipitate lead and zinc into particulate matter. The solids are then conce...  
WO/1998/048066A1
An improved method for the recovery of metal and/or chemical values from an industrial waste stream containing zinc, cadmium, lead and/or iron compounds by heating the waste stream in a reducing atmosphere, treating the resultant fumes i...  
WO/1998/048063A1
A method for the production of Group IA salts during a process for the recycling of industrial waste streams containing Group IA compounds and iron and/or zinc compounds, by heating the waste stream in a reducing atmosphere, treating the...  
WO/1998/048065A1
The invention concerns a method consisting in the following steps: a) said waste (14) is mixed with a reducing agent in divided solid state and a binder; b) said mixture (20) is compacted into agglomerates (21) with open porosity; c) sai...  
WO/1998/036102A1
Zinc values are recovered from zinc sulphide-containing raw material feed by a process which includes the steps of smelting the raw material in the presence of a carbonaceous reductant to substantially reduce the zinc sulphide to metalli...  
WO/1998/018971A1
A method for separation and recovery of metals and metal oxides from industrial minerals and waste materials containing zinc, lead, cadmium, arsenic, iron, mercury and selenium. The metals and metal oxides in dust form are mixed with a r...  
WO/1998/015666A1
The invention relates to a process for obtaining zinc and other precious metals from raw materials containing chlorine or fluorine. According to said process raw materials are lyed with sulfuric acid without calcination and metals are se...  
WO/1998/006879A1
The invention relates to a method for leaching zinc concentrate in atmospheric conditions in the presence of trivalent iron. It is essential that the zinc concentrate is fed into conditions where in addition to trivalent iron, there are ...  
WO/1998/004752A1
There is provided a process for recovering a desired product from a residue and apparatus therefor. The process includes the step of recirculating either a residue formed in one stage of the process to an earlier stage of the process or ...  
WO/1998/004755A1
The invention is applied in non-ferrous metallurgy. Its application results in achieving high non-ferrous metals recovery from metallurgical semies and secondary raw materials at lower fuel consumption as well as in reducing the dust qua...  
WO/1998/001590A1
To avoid concentration of undesired metals and other associated elements in a metallurgical process and, nevertheless, to guarantee high yield of the product produced with the metallurgical process, the following procedures are used for ...  
WO/1997/049835A1
A method and apparatus for producing a more concentrated iron product from an industrial waste materials stream (10) comprising iron and non-iron constituents such as EAF dust generally including the steps of compacting (60 A) the waste ...  
WO/1997/049637A1
A process for beneficiation of an electric arc furnace dust is disclosed. EAF dust (101) is briquetted with coal (60). The briquettes (64) are added to a furnace (12) along with a scrap metal charge (400). Zinc oxide fume (102) is driven...  
WO/1997/046722A1
A method for the recovery of iron products, specifically direct reduced iron and iron oxide suitable for use as the feedstock for steel mills, from industrial waste streams containing iron, by treating the waste streams with an ammonium ...  
WO/1997/045564A1
The invention concerns a method of treating electric arc furnace (EAF) dust. In the method the dust is preheated and decontaminated under conditions which oxidize the magnetite content of the dust to hematite. Thereafter the preheated an...  
WO/1997/041268A1
A method of stabilizing a fluidized bed in a fluidized bed roasting process for metal sulphide concentrate comprises the step of controlling the particle size distribution of the particulate material in the bed so that a minimum amount o...  
WO/1997/033007A1
The invention concerns a process for recovery of zinc from sphalerite containing ores or concentrates, whereby, in a first step, these ores or concentrates are submitted to a thermal treatment to convert sphalerite to a substance that is...  
WO/1997/032048A1
In order to separate and recover iron from nonferrous metals such as zinc contained in ironmaking dust in a short time, a mixture of ironmaking dust with a carbonaceous material in a ratio of 1:0.05 to 0.3 and a reducing gas containing h...  

Matches 201 - 250 out of 2,469