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Matches 151 - 200 out of 2,726

Document Document Title
WO/2008/144967A1
A method for recovery and production of ultrafine zinc powder from zinc-containing dust involves steps as follows: adding zinc-containing dust into alkaline solution, stirring the solution at the temperature 20?~60? and separating the so...  
WO/2008/145490A1
The invention relates to a method for processing residue containing zinc ferrites and nonferrous metals selected from the group comprising lead (Pb), silver (Ag), indium (In), germanium (Ge) and gallium (Ga) or mixtures thereof in the fo...  
WO/2008/139412A1
A method for producing a metal from a metal sulphide ore or mineral is claimed. The metal sulphide ore is leached by non-oxidative dissolution in a chloride solution to produce a metal chloride solution and hydrogen sulphide; the metal c...  
WO/2008/135574A1
Method for producing hydrometallurgical zinc oxide powder having characteristics equivalent to that derived from a French process, comprising formation of an aqueous pulp from a starting zinc oxide having particles of nodular structure, ...  
WO/2008/117649A1
A method of recovering a valuable metal from an oxide-based scrap, characterized by using an insoluble electrode as an anode, using the oxide-based scrap as a cathode, and conducting electrolysis to recover the cathode scrap in the form ...  
WO/2008/052661A1
This invention relates to a single-step pyrometallurgical process for the recovery of non-ferrous metals from zinc bearing residues, in particular from by-products of the zinc and lead industry such as goethite and jarosite. A process fo...  
WO/2008/011788A1
A reduction retort (11) used in a vacuum metal refining reduction furnace comprises a retort (12), a condenser (13) arranged on one end of the retort, a charge end shield (14) hermetically connected to the condenser, and a discharge end ...  
WO/2008/004602A1
Disclosed is a molten salt electrolysis system comprising an electrolysis vessel (4) for holding a molten electrolytic bath containing a molten metal chloride and an electrode unit (1) to be immersed into the molten electrolytic bath. Th...  
WO/2007/116580A1
A method for recycling steelmaking dust which makes it possible at a low cost to reuse dust generated in steelmaking process as a raw material in steelmaking and which is particularly excellent in dezincing efficiency. A method which com...  
WO/2007/077290A1
The invention relates to a method for improving the leaching of a sulphidic concentrate that contains valuable metals in a hydrometallurgical fabrication process of said valuable metal. The purpose is to accelerate the oxidation of sulph...  
WO/2007/074360A2
A process is described for leaching a value metal from an ore containing said value metal, the process including the steps of leaching the ore in the presence of hydrochloric acid so as to form a soluble metal-chloride salt in a leach so...  
WO/2007/074207A1
Sulphidic zinc concentrate usually also includes small amounts of rare metals such as indium and gallium. If the content of these metals in the raw material is sufficiently high, their recovery may be economically worthwhile. In the meth...  
WO/2007/074360A3
A process is described for leaching a value metal from an ore containing said value metal, the process including the steps of leaching the ore in the presence of hydrochloric acid so as to form a soluble metal-chloride salt in a leach so...  
WO/2007/068025A3
Disclosed is a method for reprocessing metallurgical dust or grinding dust, especially converter dust and arc furnace dust obtained from steel or high-grade steel production. In said method, the dust is burned and slagged with oxygen in ...  
WO/2007/068025A2
Disclosed is a method for reprocessing metallurgical dust or grinding dust, especially converter dust and arc furnace dust obtained from steel or high-grade steel production. In said method, the dust is burned and slagged with oxygen in ...  
WO/2007/042604A1
The invention relates to a method for the sulphate-based leaching of metal sulphide minerals, such as chalcopyrite, CuFeS2, containing ore in atmospheric conditions. It is beneficial for the leaching of metal sulphides that the sulphide ...  
WO/2007/039664A1
The present invention relates to a new hydrometallurgical method for recovering nickel from nickel sulphide bearing raw materials, such as sulphide concentrate or ore. In general, the process involves the oxidative atmospheric pressure l...  
WO/2007/039663A1
The present invention relates to a new hydrometallurgical process for recovering nickel from nickel bearing raw materials, such as sulphide flotation concentrates. In general, the process involves the oxidative atmospheric pressure leach...  
WO/2007/034413A2
A process for the indirect bioleaching of zinc sulphide is disclosed, and includes leaching, solvent extraction, electrowinning, and oxidant regeneration steps in a closed circuit. The leaching step utilizes ferric iron as an oxidant, th...  
WO/2007/034413A3
A process for the indirect bioleaching of zinc sulphide is disclosed, and includes leaching, solvent extraction, electrowinning, and oxidant regeneration steps in a closed circuit. The leaching step utilizes ferric iron as an oxidant, th...  
WO/2006/133777A1
The invention relates to the separation of metals in Fe-bearing zinc leaching residues, in particular neutral and weak acid leach residues. The process comprises the steps of : - preparing agglomerates containing, besides the Zn leaching...  
WO/2006/119611A1
The present invention is a method of recovering valuable metals from a quantity of furnace dust consisting the following steps. A first leaching step wherein the furnace dust is leached at atmospheric pressure in a first leaching solutio...  
WO2006041695A3
The disclosed invention provides a process for enhanced recovery of one or more metal values from heap and/or dump leaching of ores containing the metal values, the process comprising: (a) providing a high grade leach solution obtained b...  
WO/2006/079125A1
Liquid metal is continuously recovered by condensing metal vapour in a sealed system, more or less at atmospheric pressure, and collecting liquid metal in a crucible. The contents of the crucible are agitated and the temperature is contr...  
WO/2006/070052A1
The invention relates to a method, by means of which the valuable metals contained in a sulphidic, multicomponent concentrate are recovered using hydrometallurgical treatment. One constituent of the concentrate is copper sulphide, which ...  
WO/2006/041394A1
A method for recovery of metals or metal compounds from metal-bearing solid particles comprising volatile compounds comprises supplying the solid particles (50) through a flame (25) of a burner (20). The volatile compounds are then evapo...  
WO/2006/037777A1
The invention concerns a method for treating iron-and-steel plant sludge comprising adjusting the available CaO content of the sludge so as to obtain an available CaO content of 3 % to 8 % based on the sludge weight, adding a carbon-cont...  
WO/2006/027412A1
The invention is a novel process arrangement for producing pure zinc chemicals from the minor flow of a calcining-dissolving-electrolysis type of a preparation process of zinc. The invention is based on the fact that part of the producti...  
WO/2005/106053A1
Improved methods for treating metallurgical compositions involve reacting a metallurgical composition with an aqueous nitric acid solution. The reaction is performed at a pressure or at least about 220 psig and at a temperature of at lea...  
WO2005047551A8
This invention relates to a method for removing thallium from a zinc-containing solution. In particular, the method relates to the purification with metallic zinc powder of a solution going to the electrolytic production of zinc. In this...  
WO/2005/092528A1
A method for the treatment of a fly ash which comprises a process wherein a slurry of a fly ash is reacted with SO2, to thereby dissolve Ca and Zn in the fly ash into a solution, and these elements are separated from a residue containing...  
WO/2005/093107A1
A process for recovering a target metal from an oxidised metalliferous material comprises the steps of: - in a leaching stage, leaching the oxidised metalliferous material with an acidic aqueous halide solution to leach the target metal ...  
WO/2005/083134A1
The present invention relates to a process to recover zinc from zinc containing residues or scraps, especially those produced by hot-dip galvanizing lines. The process comprises the steps of: - selecting a Si-bearing compound which, at a...  
WO/2005/083133A1
A method is disclosed for analyzing, by the use of a computer system, the state of reaction in a region wherein the reduction of zinc oxide for forming zinc is carried out as a main reaction, in the inside of a blast furnace for the pyro...  
WO/2005/078146A1
A pyrometallurgy process for refining zinc, pig iron, coarse lead and coal gas, and the furnace thereof, which comprises upper electric furnace, intermediate bast furnace, lower main frequency furnace and oxygenerator and its other units...  
WO/2005/068669A1
A method of slag fuming wherein a slag containing arsenic or arsenic and antimony together with zinc and lead is heated and reduced in a slag fuming furnace, and zinc and lead are separated by evaporation, characterized in that it compri...  
WO/2005/068369A1
A distillation arrangement is presented, comprising a distillation conveyor (5) for transporting distillation material (15), and a heating arrangement (8) arranged to heat distillation material (15) in the distillation conveyor (5). The ...  
WO2005001146A3
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...  
WO2005012581A3
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/2005/047551A1
This invention relates to a method for removing thallium from a zinc-containing solution. In particular, the method relates to the purification with metallic zinc powder of a solution going to the electrolytic production of zinc. In this...  
WO/2005/045078A1
The purpose of the invention is to remove copper selectively from a concentrated zinc sulphate solution by ion exchange. The method enables a significant reduction in the use of zinc powder during the solution purification of zinc sulpha...  
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 ...  

Matches 151 - 200 out of 2,726