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WO2022037781A1 - Procédé de séparation du zinc d'un produit industriel à l'aide d'une réaction pyrométallurgique - Google Patents

Procédé de séparation du zinc d'un produit industriel à l'aide d'une réaction pyrométallurgique Download PDF

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Publication number
WO2022037781A1
WO2022037781A1 PCT/EP2020/073313 EP2020073313W WO2022037781A1 WO 2022037781 A1 WO2022037781 A1 WO 2022037781A1 EP 2020073313 W EP2020073313 W EP 2020073313W WO 2022037781 A1 WO2022037781 A1 WO 2022037781A1
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WIPO (PCT)
Prior art keywords
zinc
metal
reduced
industry product
oxidized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2020/073313
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English (en)
Inventor
Manuel LEUCHTENMÜLLER
Jürgen Antrekowitsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Montanuniversitaet Leoben
Original Assignee
Montanuniversitaet Leoben
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Filing date
Publication date
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Priority to PCT/EP2020/073313 priority Critical patent/WO2022037781A1/fr
Publication of WO2022037781A1 publication Critical patent/WO2022037781A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B13/00—Obtaining lead
    • C22B13/02—Obtaining lead by dry processes
    • C22B13/025—Recovery from waste materials
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/04—Obtaining zinc by distilling
    • C22B19/16—Distilling vessels
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/04—Obtaining zinc by distilling
    • C22B19/16—Distilling vessels
    • C22B19/18—Condensers, Receiving vessels
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/12—Dry methods smelting of sulfides or formation of mattes by gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a method of separating (reduced) zinc from an oxidized zinc-containing industry product, in particular by using a pyrometallurgical reaction.
  • the invention further relates to a use of said pyrometallurgical reaction for separating a metal alloy from the oxidized zinc-containing industry product.
  • the invention can therefore relate to the technical field of metallurgy, in particular to the chemical separation of zinc from a metal (oxide)- and/or valuable element-rich industry product.
  • Industry products may contain a high amount of (oxidized) metals and/or valuable elements, for example (oxidized) zinc.
  • These industry products may be byproducts and/or waste of industry processes like a metal, in particular steel, zinc, lead or copper, production process. Due to the content of economically relevant elements such as zinc, the described industry products may be considered as a high-potential source of raw material (resource).
  • the metals in said industry products are mostly oxidized (in form of many different mineral compounds like zinc ores, e.g. zinc oxide or zinc ferrite), so that separating the valuable elements out of the industry products in a reduced (metallic) state may be considered as effort-intensive and environmentally harmful.
  • a method for separating (reduced, metallic) zinc from an industry product comprising : i) providing the industry product, which comprises oxidized zinc (to a heating device (e.g. a furnace)), ii) heating the industry product (e.g. in the temperature range 1300°-1500°C) (by the heating device) so that the industry product (at least partially) melts (e.g. forms a slag), iii) providing a reduced (non-zinc) metal (e.g.
  • a pyrometallurgical reaction at an interface between an at least partially melted oxidized metal (e.g. zinc) comprising industry product and a reduced (non-zinc) metal in the presence of an non-oxidizing gas for separating a metal alloy from the industry product, wherein the metal alloy comprises at least one metal (e.g. cobalt, nickel, copper) that is more noble than the reduced metal (in particular wherein the reduced metal comprises iron and/or has a low vapor pressure at process temperature to prevent its evaporation, more in particular comprises a lower vapor pressure than zinc).
  • an at least partially melted oxidized metal e.g. zinc
  • a reduced (non-zinc) metal in the presence of an non-oxidizing gas for separating a metal alloy from the industry product
  • the metal alloy comprises at least one metal (e.g. cobalt, nickel, copper) that is more noble than the reduced metal (in particular wherein the reduced metal comprises iron and/or has a low vapor pressure at process temperature to prevent its e
  • the term "chemical reaction” may in particular refer to a pyrometallurgical treatment, in particular a metallothermic melt reduction.
  • a pyrometallurgical treatment in particular a metallothermic melt reduction.
  • the industry product which may e.g. comprise iron- and zinc-oxide-containing residues, is heated to the extent that it melts (e.g. larger than 1350 °C) and forms a liquid slag phase.
  • a reduced (non-zinc) metal such as metallic iron
  • zinc oxide is shown. It is, however, clear that an equivalent chemical reaction (reduction) may also take place for other chemical compounds, in which zinc is oxidized (there are more than 300 zinc minerals/ores known). These zinc compounds may include for example: ZnS, ZnCO 3 , Zn 2 (SiO 4 ).
  • the reduced gaseous zinc is formed, which is mixed with the nonoxidizing carrier gas, and leaves the melting region (of the heating device) together with the non-oxidizing carrier gas.
  • the reduced, gaseous zinc may be condensed by cooling in the form of metallic zinc (solid or liquid).
  • the term "industry product” may refer to any industry product that comprises oxidized zinc.
  • the industry product may be a waste product and/or may comprise further (oxidized) elements such as iron.
  • the industry product is a waste product from a steelmaking or copper making process.
  • the industry product may be present as (dust) particles, for example EAF dust. Table 1 below shows an example of the content (in weight percent) of an oxidized zinc-containing industry product.
  • the invention may be based on the idea that a method of separating zinc from an oxidized zinc-containing industry product after the reduction of the oxidized zinc can be performed in an efficient and environmentally friendly manner, when a pyrometallurgical reaction is performed at an interface between the (partially) melted industry product and a reduced metal in the presence of a non-oxidizing gas.
  • the redox reaction between oxidized zinc and a reduced metal is kinetically inhibited.
  • a reduced metal in particular iron
  • this reaction can be enabled and the kinetic inhibition can be released by inserting a non-oxidizing gas at the interface (the phase boundary surfaces) of the (partially) melted industry product and the (liquid or solid) reduced metal.
  • the non-oxidizing gas e.g. nitrogen
  • the non-oxidizing gas may have to be provided in order to start the reaction and control its kinetics.
  • the described method does not require any carbon and applies instead a reduced metal such as iron as a reducing agent for the zinc oxide.
  • the reduced metal can be provided in a cost-efficient and environmentally friendly manner, for example as a metal-rich waste product (e.g. a low-quality steel scrap).
  • a reduction step can be performed in order to selectively reduce the contained metal to directly provide the reduced metal.
  • the metallothermic reaction does not result in CO2 production (the net reaction, evaporation and condensation of zinc does not result in gas development), which allows the process to operate in an inert atmosphere or vacuum.
  • This makes it possible to prevent the re-oxidation of the reduced zinc.
  • metallic zinc can be directly obtained, which significantly improves the (zinc) product (e.g. prime western grade zinc) quality and increases revenues.
  • the chemical reactions take place between liquid/liquid or liquid/solid phases, which results in much higher reaction kinetics compared to the slower solid-gas- solid reactions of the prior art. Further, this leads to a significant reduction in the required size of the industrial facility.
  • a zinc oxide concentration of less than 1% has been achieved in the depleted industry product, while the iron oxide concentration was around 80% in said product.
  • Another side-product of said process is a metal alloy that comprises metals which are more noble than the reduced metal (and comprise a lower vapour pressure than zinc). While the reduced industry product (in particular iron scrap) may be considered as a low-quality scrap with respect to noble metals (in particular copper), said metals may be highly enriched in the metal alloy, resulting in an interesting product for commercial exploitation.
  • the reduced zinc is in gaseous state and is at least partially mixed with the non-oxidizing gas. This may provide the advantage that the reduced zinc is efficiently removed from the industry product (melt).
  • the melting point of zinc is much lower than that of zinc oxide, hence the reduced zinc is in gaseous state under the heated reaction conditions.
  • the zinc gas is mixed with the non-oxidizing gas at the interface and transported away from the industry product (melt).
  • the chemical reaction is a pyrometallurgical reaction that is performed in non-oxidizing conditions (non-oxidizing atmosphere, inert atmosphere, vacuum), in particular (essentially) in the absence of oxygen and carbon dioxide.
  • non-oxidizing atmosphere inert atmosphere, vacuum
  • oxygen and carbon dioxide in particular
  • the industry product starting material may contain minor concentrations of water and carbon (e.g. below 1%). Therefore, CO, CO2, H 2 O, and H 2 may be present at the beginning of performing the method. These gases may be removed in order to provide the non-oxidizing reaction conditions. For example, the undesired gases may be streamed through a gas outlet.
  • the reduced metal is a non-zinc metal, in particular the reduced metal comprises (consists of) iron.
  • the reduced metal can be provided in a very cost-efficient manner, e.g. as a low quality scrap fraction (in particular steel scrap with a high copper concentration).
  • each metal could be applied with which the described metallothermic reaction is possible, for example also aluminum or silicon.
  • non-zinc refers to the circumstance that a product comprises (essentially) no zinc or is depleted of zinc. This may not mean that the product is completely zinc-free. Instead, the term “non-zinc” may include small amounts, residues or traces. For example, a low zinc content EAF dust is not described as a non-zinc product in this context. A metal-rich waste product that is described as non-zinc in this context, may only comprise zinc in small (not essential) amounts (for example, the scrap material may have a zinc coating).
  • the reduced (non-zinc) metal is present during the chemical reaction as at least one of the group which consists of liquid state, solid state, dissolved in a solid alloy or in a liquid alloy.
  • the reduced (non-zinc) metal may be (at least partially) melted and hence be present in the liquid form.
  • the reduced (non- zinc) metal (mixture) may be partially melted with solid iron particles floating on the surface.
  • the reduced metal may be provided as an alloy.
  • the non-oxidizing gas is an inert gas, in particular at least one of nitrogen and a noble gas.
  • an inert gas in particular at least one of nitrogen and a noble gas.
  • the non-oxidizing gas is selectively provided (streamed) to the interface.
  • the non-oxidizing gas may be provided as a carrier or rinsing gas.
  • the gas may be introduced with a lance from the top of the heating device.
  • the gas may be introduced from the bottom of the heating device through flushing stones installed in the heating device, e.g. furnace, from below.
  • the gas flow rate of the nonoxidizing gas may control the kinetics of the chemical reaction (metallothermic reduction).
  • the reduced metal is provided as an additional material to the chemical reaction, in particular as part of an industry waste product, more in particular an iron-rich waste product (e.g. steel scrap).
  • an iron-rich waste product e.g. steel scrap.
  • the industry product comprises an oxidized non-zinc metal
  • providing the reduced non-zinc metal comprises: selectively reducing (e.g. in an additional reduction device) the oxidized non-zinc metal in order to obtain the reduced metal, in particular using a reducing gas, more in particular at least one of carbon monoxide and hydrogen.
  • a reduced metal product e.g. steel scrap
  • the industry product serves at the same time as a source of zinc and as a reducing agent.
  • Metal such as iron
  • a selective reduction step is performed in a preferred embodiment.
  • a reducing atmosphere is provided (e.g. H 2 or CO at 500-700°C for 1-3 hours).
  • the reaction may take place in a vertically oriented device (e.g. retort) or similar to midrex.
  • retort a vertically oriented device
  • the selective gas reduction lowers the energy necessary to perform the melting step, because less material must be heated (in particular less or no addition of scrap is required).
  • the temperature during the melting and/or during the chemical reaction is at least temporally in the range of 1350° to 1500°C. Said temperature range has been found as being very efficient in order to achieve the desired chemical reaction while saving energy.
  • the industry product comprises dust particles, in particular zinc-containing dust from the steel, copper, zinc, or lead making industry.
  • dust particles in particular zinc-containing dust from the steel, copper, zinc, or lead making industry.
  • the method further comprises agglomerating of the dust particles.
  • the dust particles may be e.g. agglomerated to pellets or pressed to briquettes. This pellets or briquettes can be used in a flexible manner to adopt necessary amounts easily.
  • the method further comprises condensing the reduced gaseous zinc in order to obtain metallic zinc in solid state or liquid state. This may provide that the industrially relevant metallic zinc can be directly obtained without a re-oxidation in between.
  • the method further comprises: separating and condensing at least one further metal (having a high vapour pressure like zinc, in particular lead) from the industry product using the non-oxidizing gas. Additionally or alternatively, the method further comprises: separating and condensing at least one alkali-metal (in particular K or Na) and at least one halogen (in particular Cl or F) in the form of a halide from the industry product using the non-oxidizing gas.
  • Substances contained in the industry product may also evaporate (mixed with the non-oxidizing gas) and accumulate together with the zinc in the condenser. While further metals, such as lead, dissolve (during condensation) into the zinc (to form a zinc metal alloy), halogens such as chlorides and fluorides form a salt slag.
  • a salt slag is formed that includes the at least one alkali-metal and/or the at least one halogen, wherein the reduced zinc (or the zinc metal alloy) is at least partially mixed with the salt slag, and wherein the method further comprises: separating the reduced zinc (or zinc metal alloy) from the salt slag, in particular using a separation (in liquid state) based on density. In this manner, the zinc (metal alloy) can be separated from the salt slag using known and established methodologies.
  • a zinc metal alloy is formed that includes at least one further metal (in particular lead) and the reduced zinc, and wherein the method further comprises: separating the reduced zinc from the zinc metal alloy using at least one of the group which consists of separation by liquidation (segregation), distillation or electrolysis.
  • the zinc can be separated from the further metal(s) using known and established methodologies.
  • Zinc alloy can be refined by known methods and may be marketed as zinc grade Z5 or PWG-R (classification according to DIN EN 1179 or ASTM B 960-08) in the form of ingots.
  • the heating and/or the chemical reaction is performed in a heating device, wherein the heating device comprises at least one of the group which consists of an induction furnace, a resistance heated furnace, an electric arc furnace.
  • Said heating devices have been found as especially suitable for performing the described heating and pyrometallurgical reaction.
  • the heating device comprises a cavity into which the industry product is brought, e.g. in form of dust particles through an aperture.
  • the heating device may further comprise an inlet for the non-oxidizing gas, so that said gas is enabled to stream to the interface.
  • the heating device may comprise an outlet (in particular to a condenser) through which the mixture of non-oxidizing gas and the gaseous zinc can leave the heating device.
  • the method further comprises: separating a (non-zinc) metal alloy from the industry product.
  • the metal alloy comprises at least one (noble) metal that comprises a higher redox potential than the reduced metal (e.g. iron). It has been surprisingly found that the described chemical reaction further produces a metal alloy of metal being more noble than the reduced metal. This may provide the advantage that industryrelevant resources can be obtain in a very cost-efficient manner as a by-product.
  • the term "noble” can be understood in particular as follows: if the standard potential (redox potential, or according to DIN 38404-6 "redox voltage") of a first metal is higher than the standard potential of a second metal, then the first metal is more noble in relation to the second metal and the second metal is less noble than the first metal.
  • the noble metal comprises a vapour pressure that is (significantly) lower than the vapour pressure of zinc.
  • the noble metal(s) remain(s) in the melt and become enriched (thereby forming the metal alloy), while the reduced metal becomes oxidized (thereby forming the metal oxide fraction).
  • the described procedure may provide the advantage that the process temperature can be lowered (colligative melting point lowering). In this manner, energy can be saved, while the lifetime of fireproofed (furnace) materials is prolonged.
  • the metal alloy may be present in liquid state, while solid parts of reduced metal (iron) flow at the interface.
  • Figure 1 illustrates a method of separating zinc from an industry product according to an exemplary embodiment of the invention.
  • Figure 2 illustrates an industrial facility for performing the method of separating zinc from an industry product according to an exemplary embodiment of the invention.
  • Figure 3 illustrates a pyrometallurgical reaction at an interface between two liquid phases according to an exemplary embodiment of the invention.
  • Figure 4 illustrates a pyrometallurgical reaction at an interface between a liquid phase and a solid phase according to an exemplary embodiment of the invention.
  • the described method comprises: i) melting (to a slag) and treating of iron- and zinc-containing materials in an induction furnace in a temperature range between 1350 and 1500°C under inert gas atmosphere or vacuum, ii) using iron as a reducing agent, and iii) inserting a rinsing gas to the interface between metal and slag to enable and accelerate the reaction.
  • the iron- and zinc-containing residue which is usually present as dust or sludge, is agglomerated and dried.
  • the dried and agglomerated dust is melted together with ferrous scrap (reduced metal) in an inert atmosphere. This leads to selective evaporation of reduced zinc.
  • the dried and agglomerated dust is treated in a metallurgical aggregate (for example a retort or a midrex (similar but lower temperature)) by reducing gases (for example CO, H 2 ) at 500-700°C for a duration of 1-4 hours.
  • reducing gases for example CO, H 2
  • the material thus pretreated is then melted in an inert atmosphere, as in variant 1.
  • the reduced metal reacts with the oxidic zinc resulting in its selective evaporation.
  • the liquid slag phase is tapped out of the furnace (heating device) after 1-3 hours, but at least as soon as the zinc oxide concentration is below a predefined threshold.
  • the metal melt is tapped out of the furnace at long intervals, only to an extent to ensure a sufficient furnace volume for the slag phase. From a process-technical point of view, it is advantageous to keep a liquid metal sump in the induction furnace.
  • spatially relative terms such as “front” and “back”, “above” and “below”, “left” and “right”, et cetera are used to describe an element's relationship to another element(s) as illustrated in the figures.
  • the spatially relative terms may apply to orientations in use which differ from the orientation depicted in the figures.
  • all such spatially relative terms refer to the orientation shown in the figures for ease of description and are not necessarily limiting as an apparatus according to an embodiment of the invention can assume orientations different than those illustrated in the figures when in use.
  • Figure 1 shows a method of separating zinc from an industry product 110 according to an exemplary embodiment of the invention.
  • the industry product 110 is a valuable element and (oxidized) metal-rich product that comprises oxidized zinc and other (oxidized) metals such as iron and copper.
  • the industry product 110 is a waste product from a steel, copper, lead, or zinc making process (e.g. electric arc furnace (EAF) dust) and is present in the form of dust particles.
  • EAF electric arc furnace
  • the dust particles are agglomerated to pellets or briquettes in an additional step.
  • the industry product 110 is provided into a heating device 150, preferably an induction furnace.
  • a non-zinc reduced metal 120 is provided within the heating device 150.
  • the non-zinc reduced metal 120 is provided as part of an industry waste product 120a, wherein the industry waste product 120a is for example a metal scrap fraction, e.g. a steel scrap fraction.
  • the industry product 110 contains non-zinc oxidized metal (in particular oxidized iron) 120b and said oxidized metal 120b is selectively reduced in a reduction device 140 in order to provide the reduced non-zinc metal 120.
  • the reduction is performed using a reducing gas, for example carbon monoxide and/or hydrogen.
  • the industry product 110 is at least partially melted in the heating device 150 and a non-oxidizing gas 130 such as nitrogen is selectively provided to an interface between the industry product 110 and the reduced metal 120.
  • a non-oxidizing gas 130 such as nitrogen is selectively provided to an interface between the industry product 110 and the reduced metal 120.
  • the chemical (pyrometallurgical) reaction is performed in the heating device 150 at said interface 115 between the at least partially melted industry product 111 and the reduced metal 120 in presence of the non-oxidizing gas 130, so that the oxidized zinc 102 is reduced 104 and the reduced metal 120 is oxidized 122, 163 (not shown in Figure 1).
  • This reaction leads to a separation of the reduced zinc 104 in gaseous state from the industry product 110 by using (i.e. in a mixture with) the non-oxidizing gas 130.
  • the described method yields in principle the product fractions: i) the reduced zinc 104 (this fraction may also contain further metals, e.g. as a zinc metal alloy, such as Pb), ii) a salt slag 161, iii) a (noble) metal alloy 162, and iv) the oxidized non-zinc metal fraction 163.
  • the salt slag 161 is mainly formed by alkalimetals (e.g. Na, K) and halogens (e.g. Cl, F) that evaporate from the industry product 110 together with the reduced zinc 104.
  • the metal alloy 162 is formed by (reduced) metals from the industry product 110, which are more noble than the reduced metal, but comprise a (significantly) lower vapour pressure than zinc (e.g. copper, nickel, cobalt, etc.).
  • FIG. 2 illustrates an industrial facility 100 for performing the method of separating zinc from an industry product 110 according to an exemplary embodiment of the invention.
  • the industrial facility 100 comprises a heating device 150 realized as an induction furnace comprising a wall structure 153 around a heating cavity, induction coils 152, and an inlet 151 for streaming a non-oxidizing gas 130 into the heating device 150.
  • a heating device 150 realized as an induction furnace comprising a wall structure 153 around a heating cavity, induction coils 152, and an inlet 151 for streaming a non-oxidizing gas 130 into the heating device 150.
  • the industry product 110 in the example shown as an EAF dust
  • the industry product 110 is provided as (agglomerated) dust particles through an aperture into the heating device 150.
  • a reduced metal (iron)-rich waste product 120 is provided at the bottom of the heating device 150.
  • the industry product 110 particles are hereby provided on top of the reduced metal 120, whereby an interface 115 region is obtained.
  • the heating device 150 is configured for heating to a temperature in the range 1350° to 1500° C, so that the industry product 110 at least partially melts and forms an oxidized metal (in particular zinc) melt 111.
  • the reduced metal 120 fraction is also at least partially melted to a metal (reduced iron) melt in the example shown.
  • the non-oxidizing gas 130 (in the example shown nitrogen is used) is selectively streamed to the interface 115 between the oxidized metal (zinc) melt 111 and the reduced metal (iron) melt 120.
  • the cavity of the heating device 150 is free of oxidizing gases. Due to the described conditions, a pyrometallurgical reaction takes place at the interface 115, so that the oxidized zinc 102 is reduced and the reduced metal (iron) 120 is oxidized. In this manner, the reduced zinc 104 is separated from the oxidized metal (zinc) melt 111 in gaseous state, being in a mixture with the non-oxidizing gas 130.
  • Said gas mixture 104, 130 streams out of the heating device 150 into a condenser device 180 of the industrial facility 100.
  • the reduced zinc 104 is condensed to metallic (liquid or solid) zinc 106.
  • the salt slag 161 and a zinc metal alloy 164 that may contain e.g. lead
  • the reduced zinc 104 can be (at least partially) present within the zinc metal alloy 164.
  • the non-oxidizing gas 130 is then streamed to a so-called bag house device 181, wherein fines and dust particles are separated. Afterwards, the washed (refined) non-oxidizing gas 130 is again provided (recycled) through the inlet 151 into the heating device 150. In this manner, the non-oxidizing gas 130 can be maintained in the production cycle which saves resources.
  • the industry product 110 starting material may contain minor concentrations of water and carbon. Therefore, CO, CO2, H 2 O, and H 2 may be present in the heating device 150. These gases should be removed in order to provide nonoxidizing reaction conditions. Said undesired gases are therefore streamed through a gas outlet 182 out of the industrial facility 100. The step of removing the undesired gases should be done at the beginning of each cycle (batch).
  • Figure 3 illustrates in detail the pyrometallurgic reaction described for Figure 2 above. It shows the interface 115 between the reduced metal (iron) melt 120 (the reduced metal is at least partially liquid) and the oxidized metal (zinc) melt 111 (industry product 110 at least partially melted).
  • the non-oxidizing nitrogen gas 130 is selectively streamed to the interface 115 between the oxidized zinc melt 111 and the reduced iron melt 120.
  • the oxidized zinc 102 is reduced and the reduced iron 120 is oxidized.
  • the reduced zinc 104 is separated from the oxidized zinc melt 111 in gaseous state, mixed with the non-oxidizing gas 130.
  • Figure 4 illustrates in detail an alternative embodiment of the pyrometallurgical reaction described for Figure 3 above.
  • the reduced iron 120 is (at least partially) solid.
  • solid iron particles may float on an (at least partially) melted reduced metal melt 120.
  • the described pyrometallurgical reaction takes place at such a solid iron particle.

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  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un procédé de séparation du zinc d'un produit industriel (110), le procédé consistant : i) à fournir le produit industriel (110) qui comprend du zinc oxydé (102) ; ii) à chauffer le produit industriel (110) de sorte que le produit industriel (110) fonde au moins partiellement (111) ; iii) à fournir un métal réduit (120) au produit industriel (110), formant ainsi une interface (115) entre le produit industriel au moins partiellement fondu (111) et le métal réduit (120) ; iv) à fournir un gaz non oxydant (130) à l'interface (115) ; v) à effectuer une réaction chimique au niveau de l'interface (115) entre le produit industriel au moins partiellement fondu (111) et le métal réduit (120) en présence du gaz non oxydant (130), de sorte que le zinc oxydé (102) se trouve réduit (104) et que le métal réduit (120) se trouve oxydé (122) ; et vi) à séparer le zinc réduit (104) du produit industriel (110) à l'aide du gaz non oxydant (130).
PCT/EP2020/073313 2020-08-20 2020-08-20 Procédé de séparation du zinc d'un produit industriel à l'aide d'une réaction pyrométallurgique Ceased WO2022037781A1 (fr)

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PCT/EP2020/073313 WO2022037781A1 (fr) 2020-08-20 2020-08-20 Procédé de séparation du zinc d'un produit industriel à l'aide d'une réaction pyrométallurgique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2020/073313 WO2022037781A1 (fr) 2020-08-20 2020-08-20 Procédé de séparation du zinc d'un produit industriel à l'aide d'une réaction pyrométallurgique

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WO2022037781A1 true WO2022037781A1 (fr) 2022-02-24

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372780A (en) * 1978-07-13 1983-02-08 Bertrand Madelin Process for recovery of metals contained in plombiferous and/or zinciferous oxide compounds
GB2234528A (en) * 1989-07-13 1991-02-06 Tolltreck International Limite Zinc recovery process
US20090229407A1 (en) * 2008-03-14 2009-09-17 Bratina James E Reductant addition in a channel induction furnace
US20160060727A1 (en) * 2013-04-17 2016-03-03 Tetronics (International) Limited Precious metal recovery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372780A (en) * 1978-07-13 1983-02-08 Bertrand Madelin Process for recovery of metals contained in plombiferous and/or zinciferous oxide compounds
GB2234528A (en) * 1989-07-13 1991-02-06 Tolltreck International Limite Zinc recovery process
US20090229407A1 (en) * 2008-03-14 2009-09-17 Bratina James E Reductant addition in a channel induction furnace
US20160060727A1 (en) * 2013-04-17 2016-03-03 Tetronics (International) Limited Precious metal recovery

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