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Matches 151 - 200 out of 2,469

Document Document Title
WO/2003/100105A1
A process for the extraction of a base metal such as Ni, Co or Zn, from a sulphide ore or concentrate containing copper and the base metal comprises the step of subjecting the ore or concentrate to pressure oxidation in the presence of o...  
WO/2003/099916A1
The present invention relates to a method for removing heavy metal compounds from a polymer substrate, in which the polymer substrate is contacted with an acid in a reactor at an elevated temperature, wherein the polymer substrate is con...  
WO/2003/089674A2
Processes for the efficient and economical beneficiation of titaniferous ore are provided. A unique process for beneficiating ore comprising pretreatment of the ore by oxidation and reduction, followed by acid leaching with sulfuric acid...  
WO/2003/066910A1
Methods and apparatus for processing electric arc furnace ('EAF') dust through a basic oxygen furnace (BOF) to recover iron value from the EAF dust and concentrate zinc from the EAF dust into a material useful as a feed in zinc manufactu...  
WO2003031334A3
A process for separating and recovering a desired metal as metal oxide from raw material is provided. The process includes placing the raw material and a reductant in a container to form a reducing microclimate within the container. A ho...  
WO/2003/062478A1
The invention relates to a method for the separation of zinc an a second metal which does not form an anionic complex in the presence of chloride ions, zinc and the second metal being present in an effluent in the form of ZnCl2 and a sec...  
WO/2003/056039A1
An apparatus and method for recovering Zn component contained in dust and sludge by vaporization and Fe component in the form of molten iron by reduction to reduce cost of sludge treatment and to prevent environmental pollution. A plural...  
WO2003025234A3
The invention relates to a method for obtaining metals from a cobalt and/or nickel arsenic sulfide ore or ore concentrate and/or a cobalt and/or nickel sulfide ore or ore concentrate, according to which the cobalt and/or nickel arsenic s...  
WO/2003/048398A1
A method of condensing metallic vapour which includes the steps of directing a stream of the vapour into a sealed condenser which includes a receiving crucible; controlling the temperature inside the crucible so that the vapour condenses...  
WO/2003/046232A1
The invention refers to the many ways of integrating and joining the processes for treating ore and silicate concentrates of zinc with the product of the sulphide roaster in the zinc industry. These processes include: (i) Use of concentr...  
WO/2003/031334A2
A process for separating and recovering a desired metal as metal oxide from raw material is provided. The process includes placing the raw material and a reductant in a container to form a reducing microclimate within the container. A ho...  
WO/2003/031666A1
Process for the production of ZnCl¿2? from a Zn bearing primary and/or secondary material comprising the steps of reacting the Zn bearing material with a chlorinating agent such as Cl¿2? to convert metals into chlorides and vaporising ...  
WO/2003/025234A2
The invention relates to a method for obtaining metals from a cobalt and/or nickel arsenic sulfide ore or ore concentrate and/or a cobalt and/or nickel sulfide ore or ore concentrate, according to which the cobalt and/or nickel arsenic s...  
WO/2003/023077A1
A process for the recovery of zinc metal from a zinc mineral includes the steps of leaching the zinc mineral in a solution including a halide species formed from two or more different halides, to leach the zinc into the solution. The zin...  
WO/2003/021708A2
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/2003/020989A1
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...  
WO2002040724A8
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/2003/006696A1
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/2002/092513A1
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 ...  
WO2002068701A3
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/2002/079521A1
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 ...  
WO2002020855A3
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/2002/072894A1
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/2002/072897A1
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/2002/072895A1
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/2002/072896A1
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/2002/068701A2
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...  
WO2002059386A8
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/2002/066708A1
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...  
WO2002006541A3
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/2002/059386A1
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/2002/053789A1
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...  
WO2001098547A3
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/2002/050320A1
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/2002/040724A1
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/2002/040723A1
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/2002/033136A1
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/2002/020855A2
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/2002/020858A1
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/2002/006541A2
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 ...  
WO2001036693B1
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/2001/098546A1
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/2001/098547A2
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...  
WO2001056684A9
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 ...  
WO2001036693A3
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/2001/068926A1
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/2001/066810A1
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/2001/062991A1
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/2001/062993A1
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/2001/056684A1
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 ...  

Matches 151 - 200 out of 2,469