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Patent Searching and Data


Matches 201 - 250 out of 1,254

Document Document Title
WO/2000/005424
The invention relates to a method for producing zinc using the IS process in an IS shaft furnace and to an IS shaft furnace for carrying out said method. To be able to utilize dust containing zinc in a simple manner the invention provide...  
WO/1999/066085
A process for the treatment of a roasted metal sulphide ore, for the separation of metals therefrom. The process comprises leaching the roasted ore with peroxysulphuric acid, optionally in the presence of chlorine, and separating a solut...  
WO/1999/063121
The invention relates to a method for recovering non-ferrous metals, particularly nickel, cobalt, copper, zinc, manganese and magnesium, from materials containing said metals by converting said non-ferrous metals into sulphates by means ...  
WO/1999/060177
The invention relates to a method for continuous separation of impurities and alloyings from liquid metal baths, e.g. iron-aluminum alloys, zinc oxides or mixed crystals from zinc baths, wherein liquid metal is extracted from the area cl...  
WO/1999/053108
The invention concerns a method for treating steel works dust in order to recuperate elements capable of being upgraded, said method comprising an attrition in water followed by hydraulic grading of the resulting load. Said method is cha...  
WO/1999/041418
A process and device are disclosed for precipitating solid compounds from the liquid zinc or liquid zinc-based alloys of a metal bath. According to the disclosed process, partial amounts of the metal phase containing the compound(s) are ...  
WO/1999/031285
The invention concerns a method for separating non-ferrous metals such as Zn and Pb from sludge containing iron, characterised in that it consists in the following operational steps: non-selective lixiviation of the iron-containing sludg...  
WO/1999/031014
A method for utilization of zinc byproducts in the manufacture of clear brine fluids comprising the step of mixing zinc feedstock containing metal impurities with a halogenic acid to produce an impure zinc halide solution. The metal impu...  
WO/1999/022037
The invention relates to a method for extracting non-ferrous metals, especially zinc, from raw materials containing metal by means of electrolysis using a technique which is known in itself. According to the inventive method, substances ...  
WO/1999/022035
A condensation chamber (32, 36) and method for condensing a metal connate from a metal rich gaseous mixture are disclosed. The condensation chamber (32, 36) includes top (38, 42) and sidewall surfaces (52, 54) that together define a cent...  
WO/1999/016917
The invention relates to a method and a device for separating zinc and/or cadmium from lead in a byproduct contaminated with said elements and/or compounds or in a residue arising during the production of metal. According to the inventio...  
WO/1999/010546
A process for the solvent extraction of metals, particularly copper, from aqueous ammoniacal solutions is provided. The extractant is an orthohydroxyarylketoxime of Formula (1), wherein R?1¿ is a hydrocarbyl group, and R?2¿ is an ortho...  
WO/1998/049105
A system and method for disposing of vacuum degasser contaminants which includes adjusting the pH, in a reactor vessel, of a vacuum degasser underflow stream to precipitate lead and zinc into particulate matter. The solids are then conce...  
WO/1998/048066
An improved method for the recovery of metal and/or chemical values from an industrial waste stream containing zinc, cadmium, lead and/or iron compounds by heating the waste stream in a reducing atmosphere, treating the resultant fumes i...  
WO/1998/048063
A method for the production of Group IA salts during a process for the recycling of industrial waste streams containing Group IA compounds and iron and/or zinc compounds, by heating the waste stream in a reducing atmosphere, treating the...  
WO/1998/048065
The invention concerns a method consisting in the following steps: a) said waste (14) is mixed with a reducing agent in divided solid state and a binder; b) said mixture (20) is compacted into agglomerates (21) with open porosity; c) sai...  
WO/1998/036102
Zinc values are recovered from zinc sulphide-containing raw material feed by a process which includes the steps of smelting the raw material in the presence of a carbonaceous reductant to substantially reduce the zinc sulphide to metalli...  
WO/1998/018971
A method for separation and recovery of metals and metal oxides from industrial minerals and waste materials containing zinc, lead, cadmium, arsenic, iron, mercury and selenium. The metals and metal oxides in dust form are mixed with a r...  
WO/1998/015666
The invention relates to a process for obtaining zinc and other precious metals from raw materials containing chlorine or fluorine. According to said process raw materials are lyed with sulfuric acid without calcination and metals are se...  
WO/1998/006879
The invention relates to a method for leaching zinc concentrate in atmospheric conditions in the presence of trivalent iron. It is essential that the zinc concentrate is fed into conditions where in addition to trivalent iron, there are ...  
WO/1998/004752
There is provided a process for recovering a desired product from a residue and apparatus therefor. The process includes the step of recirculating either a residue formed in one stage of the process to an earlier stage of the process or ...  
WO/1998/004755
The invention is applied in non-ferrous metallurgy. Its application results in achieving high non-ferrous metals recovery from metallurgical semies and secondary raw materials at lower fuel consumption as well as in reducing the dust qua...  
WO/1998/001590
To avoid concentration of undesired metals and other associated elements in a metallurgical process and, nevertheless, to guarantee high yield of the product produced with the metallurgical process, the following procedures are used for ...  
WO/1997/049835
A method and apparatus for producing a more concentrated iron product from an industrial waste materials stream (10) comprising iron and non-iron constituents such as EAF dust generally including the steps of compacting (60 A) the waste ...  
WO/1997/049637
A process for beneficiation of an electric arc furnace dust is disclosed. EAF dust (101) is briquetted with coal (60). The briquettes (64) are added to a furnace (12) along with a scrap metal charge (400). Zinc oxide fume (102) is driven...  
WO/1997/046722
A method for the recovery of iron products, specifically direct reduced iron and iron oxide suitable for use as the feedstock for steel mills, from industrial waste streams containing iron, by treating the waste streams with an ammonium ...  
WO/1997/045564
The invention concerns a method of treating electric arc furnace (EAF) dust. In the method the dust is preheated and decontaminated under conditions which oxidize the magnetite content of the dust to hematite. Thereafter the preheated an...  
WO/1997/041268
A method of stabilizing a fluidized bed in a fluidized bed roasting process for metal sulphide concentrate comprises the step of controlling the particle size distribution of the particulate material in the bed so that a minimum amount o...  
WO/1997/033007
The invention concerns a process for recovery of zinc from sphalerite containing ores or concentrates, whereby, in a first step, these ores or concentrates are submitted to a thermal treatment to convert sphalerite to a substance that is...  
WO/1997/032048
In order to separate and recover iron from nonferrous metals such as zinc contained in ironmaking dust in a short time, a mixture of ironmaking dust with a carbonaceous material in a ratio of 1:0.05 to 0.3 and a reducing gas containing h...  
WO/1997/030182
This method comprises a mixing step (90) in which a mixed processing material is obtained by mixing waste (7) and a reducing agent (8) with each other, a chlorine recovering step (91) in which chlorine and water are then recovered by hea...  
WO/1997/028287
A method for processing a powdery material, wherein said material is contacted with a non-aqueous liquid substance heated by combustion gases and comprising at least 30 % by volume of a predominantly oxidised material, substantially with...  
WO/1997/025447
A method for processing waste sulphuric or hydrochloric acid solutions containing heavy metals, and ammonia and ammonium salt solutions containing copper ions. The method comprises a complexing step using hydrazine sulphate or chloride, ...  
WO/1997/021628
The present invention discloses a process for simultaneously preparing zinc metal and aluminum chloride, which comprises reacting melted zinc chloride with aluminum in powder, granule or molten liquid thereof shape at an elevated tempera...  
WO/1997/018338
Finely divided material such as flue dust from a steel making furnace is processed to reclaim constituents. The material in hopper (11) is pelletized. The pellets are dried in a dryer (16) and fed to a first rotary kiln (21) where they a...  
WO/1997/006283
Method for upgrading waste material comprising sheet metal with a zinc plating on at least one side thereof, including a) subjecting the waste material to a mechanical processing step to improve the accessibility of said zinc layers to a...  
WO/1997/006215
A method for preparing inorganic pigments from steel mill dust, particularly electric steel mill dust, wherein (a) the dust is separated into a magnetic fraction and a non-magnetic fraction; (b) the non-magnetic fraction is subjected to ...  
WO/1997/000333
A method of extracting at least zinc from zinc-bearing materials which includes the steps of feeding the zinc-bearing material and a reducing agent at a controlled rate to a reaction zone in a d.c. arc furnace wherein at least zinc is vo...  
WO/1996/041029
A process for the extraction of Ni/Co values from an ore or concentrate comprises the steps of subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containing halide, copper and sulphat...  
WO/1996/041027
A process for the extraction of a metal from an ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containing halogen ions and a source of bisulphate or s...  
WO/1996/041026
A process for the extraction of a metal from an ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containig halogen ions and a source of bisulphate or su...  
WO/1996/038381
A method of biotreating a solid material to remove an undesired compound using a nonstirred surface bioreactor is provided. According to the method, the surface of a plurality of coarse substrates is coated with a solid material to be bi...  
WO/1996/036743
According to a process for treating metal-containing dusts arising from thermal metallurgical processes, especially dusts containing zinc, in which the dusts are taken to an agglomeration and especially a briquette-making plant (9), wher...  
WO/1996/034987
A process for recovering iron from an iron oxide bearing mass. The process includes forming a bed (27) of lump coke (28) in a vertical shaft furnace (11), feeding the iron oxide bearing mass and scrap metal onto the bed (27) of lump coke...  
WO/1996/032512
The hydrometallurgical treatment process provides for the removal of contaminants from waelz oxide, (chlorine, sodium, potassium, sulfur and fluorin, essentially), and comprises the followings steps: lixiviation with soldium carbonate in...  
WO/1996/031631
A method and a plant for treatment of fly ash are described, wherein heavy metals are separated and wherein there is formed a leaching resistant slag. The treatment takes place in a reactor (2) and the fly ash is introduced into an oxidi...  
WO/1996/029439
The present invention relates to a method of processing a sulphide mineral composition which at least partly comprises an iron containing mineral, the method comprising the steps of: (a) milling said composition to a particle size P80 of...  
WO/1996/027556
The present invention relates to a process for the purification of solutions containing metals comprising neutralization of the solution, reduction of Fe(III) present, and elimination of ingoing dissolved zinc, whereby the ingoing soluti...  
WO/1996/019593
A process for the extraction of copper from a sulphide copper ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic chloride solution to obtain a resulting pressure o...  
WO/1996/017090
A method for producing an iron-based feedstock suitable for use as the feedstock for steel mills, from industrial waste streams, by treating the waste stream with an ammonium chloride leaching solution, separating the undissolved precepi...  

Matches 201 - 250 out of 1,254