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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...
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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...
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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...
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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...
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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...
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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 ...
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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...
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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 ...
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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...
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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...
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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 ...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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 ...
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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 ...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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 ...
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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...
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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...
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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 ...
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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...
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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...
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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...
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