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Matches 151 - 200 out of 2,566

Document Document Title
WO/2005/040437A1
A method of the wet treatment of a fly ash, which comprises a step of subjecting a fly ash obtained from a combustion flue gas generated in the incineration of a municipal refuse or the like to an acid leaching treatment by the use of hy...  
WO/2005/031014A1
The invention relates to a process for the separation and recovery of non-ferrous metals from zinc-bearing residues, in particular from residues produced by the zinc manufacturing industry. The process comprises the steps of: - subjectin...  
WO/2005/012581A2
Processes for metal leaching/solvent extraction are described which comprise: (a) providing a first aqueous leach pulp which comprises a mixture of leached solids and an aqueous leach solution comprising a metal, a leaching agent and wat...  
WO/2005/010221A1
The invention relates to a method and apparatus for controlling a continuous metal removal in conjunction with a zinc preparation process, in which the metal removal is performed in one or more reactors (11a-c), in conjunction with the r...  
WO/2005/007900A1
According to the present invention there is provided a process for upgrading an ore or concentrate that contains metal sulphur minerals and gangue material. The process includes the stages of: a) selectively leaching the ore or concentra...  
WO/2005/005674A1
The invention relates to a process for the separation and recovery of non-ferrous metals from zinc-bearing residues, in particular from residues produced by the zinc manufacturing industry. The process allows for the valorisation of meta...  
WO/2005/003397A1
A method of operating mechanical separation devices at high temperatures to separate various volatile metals, metal halides and metal oxides to produce high purity materials, in particular to recover zinc or zinc oxide from electric are ...  
WO/2005/001146A2
Disclosed is a method for conditioning slags and dust accumulated during the production of high-grade steel or during trash incineration. According to said method, the molten slags are treated with H2O vapor such that metal halides are c...  
WO/2004/081242A1
A process for leaching metal contaminant(s) from an EAF dust replaces a leaching stage in a combined leaching/electrolysis circuit. In the leaching stage a metal-containing material is leached in a solution and in the electrolysis stage ...  
WO2003021708A3
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/2004/035846A1
A low pollution process for extracting arsenic in vacuum, including: heat and keep the smelting chamber to a temperature of 100-300 °C under the reduced pressure lower than 50 Pa to remove the water vapor and some dust; then heat and ke...  
WO/2004/035844A1
A process for extracting gold from arsenic-containing concentrate, including heat and keep the smelting chamber to a temperature of 100-300 °C under the reduced pressure lower than 50 Pa to remove the water vapor and some dust in the co...  
WO/2004/035845A1
A process for extraction of zinc from a material containing one or more iron oxides and zinc oxide includes heating a composite body of the material and a carbonaceous material in a reduction zone. The reduction zone contains a reducing ...  
WO/2004/024961A1
A method for the reduction treatment of a metal oxide, characterized in that it comprises using, as a raw material, a powder containing a metal oxide, and an alkali metal and a halogen element, and further optionally carbon, mixing said ...  
WO/2004/024960A1
The invention relates to a method for producing a zinc-containing sinter (1) for use as feedstock for thermal zinc extraction, particularly for extracting zinc according to the IS process. In order to produce the sinter (1), at least one...  
WO/2004/020678A1
This invention addresses the elimination of both organic and inorganic total carbon resulting from carbonates and organic matters contained in zinc silicate concentrates. As it takes full advantage of the neutralizing power of the flotat...  
WO/2004/001077A1
The invention relates to a method of extracting at least zinc oxides from a material comprising zinc compounds, which material is conveyed into a reactor at an inlet opening, said reactor comprising at least one heater means, and said ma...  
WO2003089674A3
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/2003/100105A1
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...  
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...  
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/2003/056039A1
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/2003/020989A1
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...  
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...  
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/2002/072895A1
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/2002/072897A1
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/2002/068701A2
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...  
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...  
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...  
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...  

Matches 151 - 200 out of 2,566