WO1997000333A1 - Traitement de materiaux zinciferes dans un four a arc a courant continu - Google Patents

Traitement de materiaux zinciferes dans un four a arc a courant continu Download PDF

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Publication number
WO1997000333A1
WO1997000333A1 PCT/GB1996/001461 GB9601461W WO9700333A1 WO 1997000333 A1 WO1997000333 A1 WO 1997000333A1 GB 9601461 W GB9601461 W GB 9601461W WO 9700333 A1 WO9700333 A1 WO 9700333A1
Authority
WO
WIPO (PCT)
Prior art keywords
zinc
furnace
arc furnace
bearing material
slag
Prior art date
Application number
PCT/GB1996/001461
Other languages
English (en)
Inventor
Nicholas Adrian Barcza
Albert François Simon SCHOUKENS
Glen Michael Denton
Original Assignee
Mintek
Wise, Stephen, James
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mintek, Wise, Stephen, James filed Critical Mintek
Priority to AU61311/96A priority Critical patent/AU6131196A/en
Publication of WO1997000333A1 publication Critical patent/WO1997000333A1/fr

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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
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/16—Dry methods smelting of sulfides or formation of mattes with volatilisation or condensation of the metal being produced
    • 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
    • C22B19/28—Obtaining zinc or zinc oxide from muffle furnace residues
    • 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
    • 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
    • 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

  • This invention relates generally to the reaction of zinc bearing materials with a reducing agent in a d.e. arc furnace in order to recover zinc via a vapour phase, and produce a disposable slag.
  • the invention may be applied to recover zinc from zinc bearing secondary materials, or for the treatment of zinc ores and/or primary oxidic zinc concentrates .
  • Secondary materials such as lead blast furnace slags from lead smelting, Imperial Smelting Furnace (ISF) slags from zinc/lead smelting, electric arc furnace (EAF) dusts produced during the production of carbon steel from scrap, electrolytic zinc-plant residues or leach-process residues, and drosses which contain zinc and lead, are processed primarily for environmental and recycling reasons.
  • the invention may be used for the treatment of these materials.
  • condensation stage yield a crude zinc oxide with even greater sale price
  • the invention provides a method of extracting at least zinc from zinc-bearing
  • reducing agent are fed at a controlled re: ⁇ to a reaction zone in a d.e. arc furnace
  • the zinc condenser is preferably a lead-splash condenser
  • the invention may ce applied to zinc-bearing secondary materials, or to primary
  • the zinc-bearing material may be raw but preferably is pretreated to the extent
  • a zinc recovery plant eg zinc electrowinning plant or ISF.
  • zinc-bearing material and the required quality of the product may include
  • equipment may include a.c. or d.e. melting furnaces, fluid-bed reactors, rotary
  • impurities such as S, CI, F, Na, K, Cd and Cu via an aqueous, a gas or a metal
  • a pretreatment furnace (melting furnace) may be used, for example to hold liquid
  • a pretreatment furnace may also be
  • the dust may also be subjected to aqueous dehalogenation
  • the molten zinc-bearing material may be transferred continuously, in
  • the feed materials comprise lead blast-furnace slag, ISF slag, zinc
  • pretreatment furnace or from the d.e. arc furnace (zinc fuming furnace), or via a
  • vapour phase from the pretreatment furnace or from the d.e. arc furnace (zinc
  • the reducing agent may comprise a carbonaceous material such as metallurgical
  • slag fluxing agent such as lime, silica or
  • dolomite may be used.
  • the reductant in the d.e. arc furnace should be present in a quantity which is
  • iron oxides to metallic iron i.e. less than 100kg iron reduced per 1000kg zinc
  • bearing feed material and preferably less than 30kg iron per 1000kg zinc bearing
  • the carbonaceous reducing agent must have low levels of moisture and volatiles
  • bearing feed is preferably below 0,1 %, for satisfactory zinc condensing
  • feed materials are supplied hot to the d.e.
  • arc furnace i.e. at a temperature above 200°C.
  • the d.e. arc furnace (smelting/zinc fuming furnace) contains normally one but
  • Solid or hollow graphite electrodes may be
  • the furnace is interfaced, via a relatively short refractory-lined duct, with
  • a zinc recovery unit preferably a lead-splash condenser or a lead-spray
  • Solid zinc-bearing material, reducing agents or fluxes may be fed directly to the
  • Gases such as nitrogen or argon may be
  • the molten feed may be transferred
  • the d.e. arc furnace may be tapped continuously or in batches from the d.e. arc furnace.
  • the d.e. arc furnace may be tapped continuously or in batches from the d.e. arc furnace.
  • fumace may be operated so that its tapping temperature is between 1300°C and
  • furnace may be greater than 0,8 and is preferably more than 1, to achieve more
  • the fuming furnace is operated at a power flux of at least 0,3 MW/m 2
  • the furnace and the condenser should be air tight, and operated at slightly
  • the CO:CO 2 volume ratio in the fuming fumace should be above 2 and preferably
  • reaction zone which is the surface interface of the molten slag and the reducing
  • Hard zinc formation and zinc oxidation by C0 2 may to a large extent be prevented
  • ferrosilicon as reducing agent may further improve the
  • Figure 2 is a schematic diagram of a plant for carrying out the method of the
  • Figures 1(a),1(b) and 1 (c) are substantially self explanatory and are respectively
  • pretreatment takes place for example in order to desulphurize or to remove
  • a d.e. arc fuming furnace 14 is effected via a launder and underflow weir.
  • a suitable carbonaceous reductant is fed to the smelting furnace and selective
  • the smelting furnace is batch tapped at regular intervals to remove slag, and a
  • This alloy can contain valuable elements such as cobalt and could be
  • Zinc in the slag in the furnace 14 is volatilized and the zinc vapour is condensed
  • This process is intended for the treatment of zinc calcine leach
  • leach residues either from first neutral or final acid leach.
  • the leach residues are
  • vapour is passed, as before, to a lead splash condenser 16.
  • the process shown in Figure 1(c) includes aqueous dehalogenation of EAF dust
  • dehalogeneration of pelletized dust may be carried out in a rotary kiln operated
  • FIG. 2 schematically illustrates a plant 20 according to the invention for the
  • the plant includes first and second d.e. arc furnaces 12 and 14 respectively and
  • the first furnace 12 is a d.e. arc fumace and a launder 22 extends from a tap hoie
  • the fumace 12 has a central hollow graphite electrode 28 and a side port 30 for
  • the fumace 14 also has a central hollow graphite electrode 32 and a side port 34
  • Each furnace has a refractory-lined, spray-cooled cylindrical shell, and a water-
  • the feed port 30 or 34 and a central entry port for the graphite electrode 28 or 32.
  • An off -gas port 40 is located at the side of the conical roof of the furnace 12. This
  • the anode in each furnace consists of a number of steel pins vertically
  • the condenser 16 includes a condensing chamber with at least a single impeller
  • a gas handling system 46 is provided to treat gas drawn from the condenser.
  • the system includes a refractory-lined combustion chamber 48, water-cooled
  • the process variables of major interest for the fuming furnace 14 are the
  • the operating temperature must sustain a gas entry temperature to the
  • iron that is produced is not carbon saturated and cannot be tapped at 1350°C.
  • Hot slag is fed continuously from the
  • premelter via the transfer launder 22 and underflow weir 26 into the second d.e.
  • An altemative method of operation is to feed solid lead blast-furnace slag directly
  • the zinc and lead oxides in the slag are reduced to their metals and volatilized
  • Metal primarily iron
  • the furnace 14 operates at near atmospheric pressure (less than 200mm water gauge and preferably less than 50mm water gauge but not less than 20mm) and delivers a gas to the elbow 42 and hence to the condenser 44 which consists mainly of zinc vapour, carbon monoxide, carbon dioxide and nitrogen. Zinc vapour is condensed in the condenser and molten zinc is tapped from the condenser, as required.
  • a cooling launder 60 underlies the condenser 44. Drosses are regularly removed from the cooling launder as they are generated. Gases and dust passing through the condenser are burnt in the combustion chamber 48 and are cleaned in the bag filter 54. Fumes are removed continuously from the bag filter. Gases emitted by the bag filter are monitored for solids content prior to discharge to atmosphere from the stack 56.
  • the general rule for the operation of the condenser and its cooling system is based on controlling temperature at 500°C ⁇ 50°C.
  • the lead pump speed is increased or decreased when the pump sump temperature is too high or low. If the return launder temperature is too high or low the cooling pins are immersed or withdrawn. Auxiliary fuel burners are used when the launder temperature still remains too low.
  • the temperature of the gas entering the condenser is monitored. Control parameters other than temperature are pressure, rotor speed, and rotor immersion.
  • the pressure in the condenser is kept slightly positive to avoid the ingress of air which could oxidise the zinc vapour and cause accretions .
  • the plant 20 is capable of producing Prime Western grade zinc which is saleable at attractive commercial rates.
  • the final slag from the furnace 14 consistently meets environmental leach criteria and discard slags are environmentally acceptable for disposal.
  • the process can be operated over a wide range of capacities to treat a broad spectrum of oxidic zinc containing materials.
  • the pilot-plant equipment consisted of two d.e. arc furnaces, a lead-splash condenser, a combustion chamber and a gas-cleaning system.
  • Granular lead blast-furnace slag was premelted in the first d.e. arc furnace (premelter) and hot slag was fed continuously from the premelter, via a transfer launder and an underflow weir, into the second d.e. arc furnace (zinc fuming furnace) .
  • the feed rate of lead blast-furnace slag was about 1500kg per hour.
  • Metallurgical coke was also fed to the fuming furnace, at a rate of 30kg per 1000kg of lead blast-furnace slag, via a feed port located in the roof.
  • the premelter was typically operated at 650kW (200 V, 3 , 2kA) , and the zinc fuming furnace was run at about 700kW (175 V, 4 kA) . Residual or spent slag was tapped from the furnace when about 2500kg of lead blast-furnace slag was fed to the premelter.
  • the premelter was switched off, the underflow was closed with refractories, and granular lead blast-furnace slag was fed directly to the fuming furnace. In that case the fuming furnace was operated at power levels of about 1200kW. In total about 600 metric tons of lead blast-furnace slag was processed through the pilot- plant.
  • the lead blast-furnace slag contained 10,9% ZnO, 2,5 % PbO, 23,2% FeO, 26,8% Si0 2 ⁇ , 21,6% CaO, 4,8% MgO and 4,0% A1 2 0 3 .
  • arsenic were removed via a metal/speiss phase of the fuming furnace.
  • Zn in vapour being defined as: Zn in feed - Zn in slag
  • blast-furnace slag was processed.
  • the zinc extractions varied between 80% and 90%
  • Zinc fuming rates were calculated for a period during which 60t of cold lead blast ⁇
  • furnace slag was fed at a relatively high feed rate of 2000kg per hour.
  • the furnace was typically operated at
  • the average slag tapping temperature was 1465°C.
  • dehalogenated and dried dust contained 24,6% ZnO, 2,3% PbO, 44,7% Fe 2 O 3 , 4,4%
  • the zinc condensing efficiency was about 80%.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

On décrit un procédé d'extraction tout au moins de zinc à partir de matériaux zincifères, lequel comprend les étapes consistant à fournir acheminer le matériau zincifère ainsi qu'un agent de réduction, selon un débit régulé, dans une zone de réaction dans un four à arc à courant continu, dans lequel au moins le zinc est volatilisé, puis à recueillir ce zinc volatilisé sous une forme appropriée.
PCT/GB1996/001461 1995-06-15 1996-06-17 Traitement de materiaux zinciferes dans un four a arc a courant continu WO1997000333A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61311/96A AU6131196A (en) 1995-06-15 1996-06-17 The processing of zinc bearing materials in a dc arc furnace

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA954963 1995-06-15
ZA95/4963 1995-06-15

Publications (1)

Publication Number Publication Date
WO1997000333A1 true WO1997000333A1 (fr) 1997-01-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/001461 WO1997000333A1 (fr) 1995-06-15 1996-06-17 Traitement de materiaux zinciferes dans un four a arc a courant continu

Country Status (2)

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AU (1) AU6131196A (fr)
WO (1) WO1997000333A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000050652A1 (fr) * 1999-02-26 2000-08-31 Mintek Traitement de concentres de sulfure metallique par grillage et par reduction par fusion dans un four a arc
RU2476611C2 (ru) * 2007-10-19 2013-02-27 Поль Вурт С.А. Извлечение металлов из отходов, содержащих медь и другие ценные металлы
US9733016B2 (en) 2005-06-08 2017-08-15 Sms Group Gmbh Process and arrangement for extracting a metal from slag a containing said metal
CN114990348A (zh) * 2022-05-30 2022-09-02 金川镍钴研究设计院有限责任公司 一种铜镍渣生产粗铜的方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH101213A (de) * 1921-11-24 1923-09-01 Tharaldsen Filip Verfahren und Ofen zur elektrothermischen Herstellung von Zink.
FR2399481A1 (fr) * 1977-08-03 1979-03-02 Gintsvetmet Tsvetnykh Metallov Procede d'extraction de zinc a partir de laitiers zinciferes
EP0285458A2 (fr) * 1987-04-02 1988-10-05 Elkem A/S Méthode pour le traitement des poussières contenues dans les fumées de procédés métallurgiques
EP0441052A1 (fr) * 1989-12-22 1991-08-14 Elkem Technology A/S Procédé de récupération de zinc à partir de déchets zincifères
EP0489591A1 (fr) * 1990-12-06 1992-06-10 Elkem Technology A/S Procédé de traitement des sous-produits et des déchets zincifères
WO1995021945A1 (fr) * 1994-02-15 1995-08-17 Odda Recycling As Procede permettant d'eliminer des halogenes d'un materiau contenant du zinc

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH101213A (de) * 1921-11-24 1923-09-01 Tharaldsen Filip Verfahren und Ofen zur elektrothermischen Herstellung von Zink.
FR2399481A1 (fr) * 1977-08-03 1979-03-02 Gintsvetmet Tsvetnykh Metallov Procede d'extraction de zinc a partir de laitiers zinciferes
EP0285458A2 (fr) * 1987-04-02 1988-10-05 Elkem A/S Méthode pour le traitement des poussières contenues dans les fumées de procédés métallurgiques
EP0441052A1 (fr) * 1989-12-22 1991-08-14 Elkem Technology A/S Procédé de récupération de zinc à partir de déchets zincifères
EP0489591A1 (fr) * 1990-12-06 1992-06-10 Elkem Technology A/S Procédé de traitement des sous-produits et des déchets zincifères
WO1995021945A1 (fr) * 1994-02-15 1995-08-17 Odda Recycling As Procede permettant d'eliminer des halogenes d'un materiau contenant du zinc

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
N.L. PIRET, A.E. MELIN: "Kriterien der Prozesswahl für die Verarbeitung von zinkhaltigen Rückstandsmaterialien", ERZMETALL, vol. 44, no. 2, February 1991 (1991-02-01), WEINHEIM, DE, pages 81 - 96, XP000147251 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000050652A1 (fr) * 1999-02-26 2000-08-31 Mintek Traitement de concentres de sulfure metallique par grillage et par reduction par fusion dans un four a arc
US6699302B1 (en) 1999-02-26 2004-03-02 Mintek Treatment of metal sulphide concentrates by roasting and electrically stabilized open-arc furnace smelt reduction
US9733016B2 (en) 2005-06-08 2017-08-15 Sms Group Gmbh Process and arrangement for extracting a metal from slag a containing said metal
RU2476611C2 (ru) * 2007-10-19 2013-02-27 Поль Вурт С.А. Извлечение металлов из отходов, содержащих медь и другие ценные металлы
CN114990348A (zh) * 2022-05-30 2022-09-02 金川镍钴研究设计院有限责任公司 一种铜镍渣生产粗铜的方法

Also Published As

Publication number Publication date
AU6131196A (en) 1997-01-15

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