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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 ...
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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 ...
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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...
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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 ...
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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 ...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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, ...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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WO/1996/015279 |
A process for the conversion of insoluble sulphide minerals into soluble sulphate compounds and other compounds which includes subjecting a mixture of a sulphide mineral and a suitable reagent to mechanical activation with or without the...
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WO/1996/014438 |
There is provided a novel class of additives, specifically coals, which are useful in zinc extraction processes involving one or more pressure leach stages carried out at temperatures above the melting point of sulphur. Such processes ma...
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WO/1996/008585 |
A method for recovering metals from industrial waste streams (500) which entails treating the waste streams with an ammonium chloride solution (100), separating the undissolved precipitates comprising iron compounds from the leachant sol...
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WO/1996/005329 |
In a hydrometallurgical process for converting zinc sulfide in an ore containing zinc sulfide, the zinc sulfide being chemically converted at elevated temperatures to ZnSO4.xH2O which crystallizes substantially in the monohydrate form as...
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WO/1996/002689 |
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 ...
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WO/1996/000309 |
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...
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WO/1995/030626 |
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...
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WO/1995/021945 |
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...
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WO/1995/015329 |
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...
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WO/1995/006140 |
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...
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WO/1994/028184 |
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...
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WO/1994/025632 |
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...
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WO/1994/021832 |
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) ...
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WO/1994/021830 |
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 ...
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WO/1994/017216 |
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 ...
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WO/1994/008058 |
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 ...
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WO/1994/008057 |
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...
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WO/1994/005818 |
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 ...
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WO/1994/002210 |
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...
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