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Matches 301 - 350 out of 2,619

Document Document Title
WO/1996/002689A1
The object of the invention is to provide for an improved electrochemical dissolution process for electrochemically dissolving a first metal by simultaneously creating hydrogen evolution at a second metal, the second metal being a metal ...  
WO/1996/000309A1
The invention concerns the use, in the solvent extraction of iron ions from aqueous solutions, of hydrocarbon-soluble aminomethylene phosphonic acid derivatives containing the structural entity (I) in which R1 and R2 are hydrogen, C1-C30...  
WO/1995/030626A1
A method for the recovery of chemical values, such as metals including zinc, zinc oxide, iron-carbon feedstocks, lead and cadmium, from industrial waste streams which entails treating the waste streams with carbon and an ammonium chlorid...  
WO/1995/021945A1
In the recycling of steel, the galvanized and painted steel increases its proportion all the time and the zinc is collected mostly as dry or wet dust. When this dust is worked up, the halogens from the paint causes a problem. By evaporat...  
WO/1995/015329A1
Compounds of formula (I), wherein R1 is an optionally substituted 2-alkylphenoxy group, each of R2, R3 and R4 is a group selected from optionally substituted 2-alkylphenoxy, optionally substituted phenyl, optionally substituted alkyl and...  
WO/1995/006140A1
A portion of the concentrates is roasted and a portion of the resulting calcine is subjected to a neutral leaching step. Another portion of the concentrates is directly leached in an acidic medium in the presence of oxygen and under atmo...  
WO/1994/028184A1
Zinc is recovered by an integrated bioleaching, solvent extraction system where the aqueous raffinate from the solvent extraction stage is recycled to the bioleach stage. Operating costs are significantly reduced, pressure vessels are no...  
WO/1994/025632A1
A process for recovering zinc and iron from zinc- and iron-containing sulphidic material, which also contains lead and silver, in which the sulphidic material is leached under oxidizing conditions in a two stage countercurrent pressure l...  
WO/1994/021830A1
A process for recovering zinc and iron from zinc- and iron-containing sulphidic material, which also contains lead and silver, in which the sulphidic material is leached under oxidizing conditions in a series of leach steps to produce a ...  
WO/1994/021832A1
Zinc is recovered from zinc sulphide material by introducing such material at a feed station (42) into a molten copper sulphide matte which is circulated in a closed loop path through said feed station (42), a zinc recovery station (16) ...  
WO/1994/017216A1
A continuous hydrometallurgical process for conversion of ore derived copper and/or zinc sulfides into recoverable water soluble sulfates is provided. The process comprises: i) contacting the ore derived copper and/or zinc sulfides with ...  
WO/1994/008057A1
A method for the recovery of zinc oxide from industrial waste materials of various components, including zinc, lead, iron and cadmium, by roasting the waste material at an elevated temperature, treating the waste material with an ammoniu...  
WO/1994/008058A1
Zincky powder generated during the manufacture of steel is lixiviated in an alkaline solution to produce an alkaline zincky solution and an iron residue for separation. This solution is neutralized with acid to give a zincky precipitate ...  
WO/1994/005818A1
A process and condensing system (10) is provided for condensing zinc and other metal vapors from a gaseous stream. A duplex condensing bath is provided, having a bottom layer of molten zinc and a top layer comprising a liquid condensing ...  
WO/1994/002210A1
A method is described which allows two hazardous waste products, namely PVC and electric arc furnace dust, both of which have negative commercial value, to be combined to produce an iron oxide suitable for steel making, pure cadmium, lea...  
WO/1994/000606A1
A process for producing one or more metals from a mineral feedstock (12) is defined. The mineral is fed to a leaching apparatus (10) wherein it is contacted with electrolyte (14). The leaching apparatus has zones of decreasing oxidation ...  
WO/1993/024666A1
Copper and/or nickel sulphide ore concentrates of high intrinsic energy value are oxygen smelted by introducing such concentrates via feeds (32) into a closed loop extraction circuit in which a molten sulphide carrier composition is forc...  
WO/1993/020898A1
The object of the invention is to provide a process and the corresponding industrial Plant(s) which make feasible the thermal treatment of Hazardous Waste of different nature and origin also mixed, excluding the release of harmful efflue...  
WO/1993/019213A1
The metallurgical-works dust is taken to a first furnace atmosphere, preferably at 1000 to 1100 °C. The dust pellet is kept with continuous agitation therein until especially chlorine, alkaline and lead compounds have virtually totally ...  
WO/1993/014030A1
A method for the recovery of zinc oxide from industrial waste materials of various components, including zinc, lead, iron and cadmium, comprising the steps of treating the waste material with an ammonium chloride solution maintained at a...  
WO/1993/011573A1
The invention relates to a method of processing used batteries, especially zinc-carbon and alkali-manganese batteries, in order to recover any usable or environmentally relevant substances, comprising the mechanical reduction of the init...  
WO/1993/008310A1
A process suitable for the extraction or recovery of metal values from arsenic containing feeds and including the steps of: a) treating the feed with a nitric acid-containing leachant solution in order to dissolve the desired metals; b) ...  
WO/1992/008815A1
A process for the treatment of zinc sulfide or other zinc bearing feed materials in conjunction with an iron sulfide containing mineral or compound to effect a separation of zinc from iron by fuming of either zinc and sulphur vapour or z...  
WO/1992/006222A1
The invention relates to the field of metallurgy and to a method and a device for the extraction of zinc in solution in a liquid iron bath (2) held in a container (3), such as a crucible for the casting of foundry parts. It is characteri...  
WO1991009977A3  
WO/1991/009977A2
Zinc is recovered by melting in a furnace a mass containing oxides of zinc and iron, a slag-forming flux material and a carbonaceous material, the content of the carbonaceous material being selected to avoid excessive foaming. The zinc v...  
WO/1991/009146A1
A process is disclosed for recovering zinc, lead, copper and precious metals from zinc plant residue, said process comprising leaching the residue with return zinc spent electrolyte, neutralizing residual acid and reducing ferric iron in...  
WO/1991/008317A1
Zinc may be recovered from zinc sulphide concentrates by establishing a molten slag bath at 1150 °C to 1300 °C containing ferrous and ferric oxides, dissolving zinc sulphide in the bath, oxidizing the zinc sulphide by reaction with the...  
WO/1991/007225A1
Metal vapour, for example zinc fume in the offgas of a smelting furnace, is captured by bringing the stream into direct contact with a fluidized bed of solid particles having a particulate loading of greater than 10 kg/m?3¿ and preferab...  
WO/1991/003424A1
A high temperature process for leaching selected metal compounds, such as gallium or germanium, from ores containing those selected metal compounds is disclosed. The method generally includes contacting metal-containing ores with an admi...  
WO/1991/002825A1
A process for absorbing zinc vapour in molten lead is characterized in that a gas containing zinc vapour is contacted with and then separated from a flowing stream of molten lead in a cyclone.  
WO/1990/013679A1
A process is described for the partial desulphurization roasting of a variety of zinc bearing sulphide ores or concentrates by adjusting the roaster temperature and residence time in the roaster thus providing an oxygen deficient atmosph...  
WO/1989/010791A1
A new depressant for use in enhanced separation of polymetallic sulphides is described. The depressant agent is used in conjunction with convention collector agents and frothing agents in the flotation separation of copper, nickel, lead,...  
WO/1989/009289A1
The invention relates to a process for recovering non-ferrous metal values such as nickel, cobalt, copper, zinc, manganese and magnesium from material containing said metals, by converting the non-ferrous metal values into sulphates by u...  
WO/1988/001654A1
Lead-zinc complex sulphide ores or concentrates are treated by a process which comprises: a) adding the ore or concentrate to a bath of molten matte which is overlaid by a slag layer; b) agitating and heating the bath by submerged inject...  
WO/1987/003010A1
A furnace (10) and process for recovery of zinc from sulphide materials in which zinc sulphide material together with an oxidizing gas is introduced by lance (20) into a first (17) of two laterally adjacent zones (17, 18) formed by a gas...  
WO/1987/002068A1
The mixture of sulfides is chemically attacked with an aqueous oxidizing solution of fluosilicic acid for dissolving the metals present. From said solution, the lead, and optionally the silver, is reprecipitated to the state of sulfates ...  
WO/1986/006361A1
Preparation of metal carbides, nitrides, borides, silicides and phosphides, also metal alloys and pure metals, by providing a precursor in which there are organic ligands bonded to the metal or metals, such precursor having the element X...  
WO/1986/002107A1
Recovering zinc from zinc bearing ore or concentrate (1) in an electrolic cell (3) which includes a cathode (5) containing cathode compartment (16) and an anode (4) containing anode compartment (2). The cathode and anode compartments are...  
WO/1985/000385A1
A process for recovering metal values from a zinc-containing complex sulphide material comprising leaching the material in a first leaching stage with a controlled amount of an aqueous chloride lixiviant solution containing cupric chlori...  
WO/1982/000664A1
Method for selectively extracting germanium from an aqueous acid solution containing, in addition to germanium, at least another metal selected from the group comprising cadmium, zinc, cobalt, iron, arsenic, aluminium, gallium and nickel...  
WO/1981/003500A1
A process for the production of ferrous metals or alloys thereof in which Zn and other heavy metals are recovered from the iron-bearing flue dust and the iron dust residue is returned to the furnace. The iron bearing flue dust is first s...  
JP2017061725A
[Subject] Provide a recovery subsystem and a recovery method which raise a recovery rate of a low melting point alloy. Raise the maintenance nature of a centrifugal separation tub. [Means for Solution] A low melting point alloy which dis...  
JP6098499B2  
JP6099167B2  
JP6094468B2  
JP6094467B2  
JP2017048413A
[Subject] In manufacture of zinc oxide ore, deterring generation of coaching in a rotary kiln for dry heating, and growth, and avoiding a fall of productivity, also maintain a high extraction ratio of halogen in a furnace, and provide a ...  
JP2017048411A
[Subject] In manufacture of zinc oxide ore, also deterring generation of coaching in a rotary kiln for dry heating, maintain a high extraction ratio of halogen in a furnace, and provide a manufacturing method which can manufacture high-d...  
JP6090080B2  

Matches 301 - 350 out of 2,619