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Patent Searching and Data


Matches 151 - 200 out of 1,241

Document Document Title
WO/2003/021708
The invention concerns a method for treating electric cells for recovering upgradable elements, by combining basic washing to eliminate soluble salts and in particular chlorides through an attrition process, with ultrasound-aided sulphur...  
WO/2003/020989
An improved method and apparatus for recovering metal values from Electric Arc Furnace (EAF) dust, particularly zinc and iron values, by mixing EAF dust and carbonaceous fines to form a particulate mixture; heating the mixture at a suffi...  
WO/2003/006696
A method of extracting zinc from a sulphidic ore is provided which comprises bioleaching the ore in a heap with acidophilic microorganisms to produce a pregnant leach solution which is recovered from the bottom of the heap. An integrated...  
WO/2002/092513
The inventive method for producing zinc oxide consists in injecting powdered zinc contained in the flow of oxygen-containing gas in to a reaction zone. Said zone is pre-heated to a temperature ranging from the zinc boiling point to near ...  
WO/2002/079521
The invention relates to a recovery method consisting in subjecting the residues (said residues having been previously mixed with carbon and a fluxing agent and agglomerated) to an initial treatment involving distillation with partially ...  
WO/2002/072894
The present invention relates to an arrangement and method that help to reduce the build-up formed on the grate of a fluidized-bed furnace in the roasting of fine-grained material such as concentrate. The concentrate is fed into the roas...  
WO/2002/072897
A method of producing a nickel base alloy includes casting the alloy within a casting mold and subsequently annealing and overaging the ingot at least 1200 °F (649 °C) for at least 10 hours. The ingot is electroslag remelted at a melt ...  
WO/2002/072895
The invention relates to a method for removing calcium from a sulfate solution in the zinc production process. Calcium is removed as an anhydrate from the raw solution coming from concentrate or ore leaching before the solution purificat...  
WO/2002/072896
The invention relates to a method for the leaching of oxidized ores and in particular zinc ores. The ore, wherein the valuable metals are at least partially in silicate form, are routed to an acidic leaching stage in conditions where the...  
WO/2002/068701
An apparatus and a process for producing zinc oxide from a zinc-bearing material are provided. The process comprises the steps of leaching the complex sulfide material with hydrochloric acid, ferric chloride, and oxygen; precipitating ir...  
WO/2002/066708
The method comprises the following steps: a) lixiviation; b) solid-liquid separation; c) neutralization of the aqueous solution; d) solid-liquid separation of the zinc-rich solution; e) zinc extraction; f) purification of the organic sol...  
WO/2002/059386
This invention deals with the concentration process of zinc silicate based minerals, particularly willemite and calamine concentration, by single operations, including conventional steps of ore treatment, some of which comrpise the follo...  
WO/2002/053789
The invention relates to a method for eliminating and recovering zinc contained in compacted galvanized scrap, which is normally used as raw material for melting in foundries and steel works, wherein zinc is evaporated and separated from...  
WO/2002/050320
A process for purifying zinc wherein a zinc containing impurities is introduced to a rectifying column having a plurality of column plates for purification, characterized in that the distillation of zinc is carried out while maintaining ...  
WO/2002/040724
The present invention relates to method, which helps to reduce and remove the build-up forming on the grate of a fludized-bed furnace in the roasting of fine-grained material such as concentrate. The concentrate is fed into the roaster f...  
WO/2002/040723
This invention relates to a method for stabilizing a fluidized bed used in roasting by adjusting the oxygen content of the roasting gas in the bed. The fine-grained material for roasting is fed into the furnace above the fluidized bed an...  
WO/2002/033136
The invention concerns agglomerated elements consisting of a mixture comprising, by dry weight, 65 to 85 % of metallurgical dust containing iron, zinc and lead oxides, CaO and more than 5 wt. % of zinc, 0.3 to 3 %, preferably 0.6 to 1,2 ...  
WO/2002/020855
A process for the recovery of zinc from a zinc sulphate ore or concentrate comprises the steps of subjecting the concentrate to pressure leaching with an acidic solution containing at least about 15 g/l iron in solution to produce a zinc...  
WO/2002/020858
The invention concerns a method for recuperating metal elements from zinc-bearing raw materials, characterised in that it consists in extracting from said zinc-bearing raw materials the elements having affinity for lead, by contacting (3...  
WO/2002/006541
The present invention relates to an apparatus and a process for producing zinc oxide from an acid soluble zinc-bearing material. The process according to the present invention comprises the steps of leaching the zinc oxide material with ...  
WO/2001/098546
The invention concerns a method for recycling sludge derived from blast furnace gas purification in aqueous phase, characterised in that it consists in carrying out the following steps: (1) treating the sludge with a sulphuric acid solut...  
WO/2001/098547
A method of processing flue dust that contains one or more compounds from a first group of zinc, lead and cadmium compounds, and contains iron compounds, involves heating the flue dust to cause a substantial portion of one or more of the...  
WO/2001/068926
The invention relates to a method of regulating a roasting furnace in fluidized bed roasting. Part of the roasting furnace grate is separated off into a separate grate section, known as the overflow grate, where the nozzles and the amoun...  
WO/2001/066810
A method for agglomerating and sintering iron and zinc ore and ore concentrates, steel mill ferrous waste and zinc mill waste. The method has the steps; a) mixing the waste or ore with a combustion fuel source, and a sinter agglomeration...  
WO/2001/062991
The invention concerns a method for upgrading steel plant dust to recuperate industrially reusable compounds. Said method comprises an attrition and dilution step, a solid/liquid separating and solid washing step, an acid leaching step, ...  
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/2001/056684
The invention relates to a method of treating a halogen containing solid or semi solid waste material from a flue gas cleaning process, wherein the amount of alkaline compounds is sufficient to provide a suspension of the waste material ...  
WO/2001/055460
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/2001/048255
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/2001/044520
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/2001/036693
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/2001/025497
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/2001/023627
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/2001/016383
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/2001/016384
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/2001/012866
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...  
WO/2001/000355
Zinc-based metal foamed bodies containing, in addition to zinc and the usual impurities, 2-20 wt. % aluminium.  
WO/2000/061826
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/2000/050652
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/2000/050649
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/2000/036167
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/2000/031308
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/2000/020651
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/2000/017404
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/2000/009770
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/2000/005424
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/1999/066085
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/1999/063121
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/1999/060177
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...  

Matches 151 - 200 out of 1,241