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WO2006041394A1 - Procede et utilisation d'un appareil pour le recyclage de metaux ou de composes metalliques - Google Patents

Procede et utilisation d'un appareil pour le recyclage de metaux ou de composes metalliques Download PDF

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Publication number
WO2006041394A1
WO2006041394A1 PCT/SE2005/001506 SE2005001506W WO2006041394A1 WO 2006041394 A1 WO2006041394 A1 WO 2006041394A1 SE 2005001506 W SE2005001506 W SE 2005001506W WO 2006041394 A1 WO2006041394 A1 WO 2006041394A1
Authority
WO
WIPO (PCT)
Prior art keywords
solid particles
burner
flame
metal
raw material
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/SE2005/001506
Other languages
English (en)
Inventor
Joachim VON SCHÉELE
Åke HOLMSTRÖM
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Priority to US11/574,982 priority Critical patent/US20070215019A1/en
Priority to EP05792438A priority patent/EP1834000A1/fr
Priority to BRPI0515963-6A priority patent/BRPI0515963A/pt
Priority to CA 2580648 priority patent/CA2580648A1/fr
Publication of WO2006041394A1 publication Critical patent/WO2006041394A1/fr
Anticipated expiration legal-status Critical
Priority to NO20072458A priority patent/NO20072458L/no
Ceased legal-status Critical Current

Links

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
    • C22B19/34—Obtaining zinc oxide
    • 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
    • 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
    • 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
    • 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 present invention relates generally to a method for calcining of metal-bearing solid particles or dust.
  • the invention also relates to the use of an apparatus for performing such a method.
  • wastes include but are not limited to electric arc furnace (EAF) steel dusts and foundry wastes as well as zinc-bearing feeds, includ- ing foundry dusts and sludges.
  • EAF electric arc furnace
  • FIG. 1 A prior art plant for metals recycling from steel- making and foundry wastes is described in the article "Metals recycling from steelmaking and foundry wastes by Horsehead resource development” published in 1992 Electric furnace conference proceedings, pages 145- 157.
  • This prior art plant is shown in Fig. 1.
  • the plant disclosed in this article comprises rotary kilns, which are arranged to heat the process mater ⁇ ials and thereby provide a recycling process.
  • This process includes two major steps.
  • the starting material such as a mixture of zinc bearing feed and coal or coke is fed to a first kiln and the starting material is divided into iron-rich material and dust.
  • the dust which is collected in a filter, comprises zinc oxide and other compounds and elements, such as salts, cadmium and lead.
  • calcining is generally meant the conversion of the physical or chemical properties of a substance by the application of heat.
  • An alternative process route to the prior art plant described above consists of liquid slag fuming as the first step and calcining in a rotary kiln as the second step.
  • a major drawback with the described recycling process is the fact that the rotary kilns are large and cumbersome to operate.
  • a rotary kiln described in the above mentioned article could be of a length of up to 100 meters and have a diameter of up to three meters. It is appreciated that a plant including rotary kilns of this kind is expensive to operate.
  • a further drawback is the fact that toxic compounds if present, such as dioxins, are evaporated by the process heat without being broken down. This is due to the limited process temperature of the counter current kiln based calcining process. Vaporized dioxins are then directed to the gas cleaning section of the plant or even the ambient atmosphere, thereby constituting a hazard to the environment.
  • the international publication WO01/86011 Al discloses a method for recovery of metals, wherein metallic fines are supplied to a flame of a burner (20) and the fines are brought to melt and to agglomerate. The agglomerated product is then recovered.
  • An object of the present invention is to provide a method for recovery of metals and metal compounds from metal-bearing solid particles in which the above- mentioned drawbacks with known techniques are avoided or at least mitigated. Another object is to provide a use of an apparatus for recovery of metals and metal compounds from metal-bearing solid particles.
  • the invention is based on the realization that metal- bearing solid particles can be fed directly through the flame of an oxy-fuel burner without melting the metal or metal compound to be recovered, i.e., the original shape and the state of aggregate of the solid particles are maintained.
  • the use of a burner in combination with feeding the solid particles directly into and through the burner flame makes it possible to control the heating process in such a way that the solid particles are left unmelted after having passed the burner flame.
  • the pro ⁇ blems of prior art are overcome or at least mitigated.
  • the heating process can be controlled in a satisfying way, avoid ⁇ ing melting of the metal-bearing solid particles supplied through the burner.
  • control of the process is further enhanced and the volume of the exhaust gas is minimized.
  • Fig. 1 is a schematic diagram of a prior art plant for recovery of metals from metal-bearing dust
  • Fig. 2 is a schematic diagram of an apparatus used with the inventive method
  • Fig. 3 is a sectional view of a burner used with the method according to the invention.
  • Fig. 4 is a cross-sectional view of the burner shown in figure 2;
  • Fig. 5 shows an alternative embodiment of an apparatus used with the inventive method.
  • the starting material such as a mixture of zinc bearing feed and coal or coke is divided into iron-rich material and zinc rich but contaminated dust.
  • the zinc rich dust calcined to a zinc rich product with low contents of impurities In the second kiln is the zinc rich dust calcined to a zinc rich product with low contents of impurities.
  • FIG. 2 an overall diagram of a plant for recovery and upgrading of metals and metal compounds, generally designated 10, is shown.
  • the term recovery is intended to encompass recovery with or without any further treatment of the resulting raw material.
  • the plant 10 is essentially identical to the plant described in the international patent publication WO 01/86011.
  • the plant is built around a burner 20 installed in a sidewall of a fur ⁇ nace 30.
  • the burner is a so-called oxy-fuel burner and is thus supplied with fuel, such as fuel oil, propane, natural gas, or butane through a first feeding line 21 and with oxygen through a second feeding line 22.
  • fuel such as fuel oil, propane, natural gas, or butane
  • oxygen is in this context meant a gas with an O 2 content exceeding 21% and preferably so-called technical oxygen having an O 2 content of 90-99.5%.
  • Metal-bearing dust or solid particles are supplied through a third feeding line 23.
  • EAF electric arc furnace
  • Waelz kiln dusts Waelz kiln dusts
  • slag fuming furnace dusts lead and copper plant dusts and foundry wastes
  • zinc- bearing feeds including foundry dusts.
  • both fines, normally meaning products resulting from crushing and sintering, and dust, normally meaning products collected in filters, are possible raw material for use with the inventive method as well as other equivalent materials, such as powder.
  • the metal-bearing solid particles also contain unwanted compounds, such as cadmium, lead, different salts, sodium chloride, potassium chloride, oxides, fluorides etc. It will be appreciated that the expression compounds are to include elements.
  • the burner 20 will be described in more detail below with reference to Figs. 3 and 4.
  • the third feeding line 23 is also connected to a feeder, generally designated 40.
  • the feeder 40 com ⁇ prises a silo 42, into which solid particles are fed.
  • the solid particles are directed from the silo 42 to a pressure vessel 44, from which they are further directed to the third feeding line 23 connected to the burner 20.
  • a desired supply rate of solid particles to the burner 20 is ensured.
  • the solid particles are intermixed in a fluid acting as bearer, thus creating a slurry that is fed to the burner 20.
  • the burner 20 will now be described in detail with reference to Figs. 3 and 4.
  • the burner 20 comprises a main portion 24, to which the three supply lines 21-23 shown in Fig. 2 are connected.
  • the portion 24 is pro ⁇ vided with an essentially circular cross-section, see Fig. 4, in which the configuration of the supply lines 21-23 appears in more detail.
  • Fuel is supplied through the first supply line 21 in the form of six equi- distant pipes 21a-f placed at a constant distance from the center axis of the main portion 24.
  • Oxygen is supplied through an annular outer portion 22 and thus surrounds the fuel supplied through the pipes 21a-f.
  • solid particles are supplied through the pipe 23, which is co-axially placed in the burner.
  • the burner 20 is mounted in the sidewall of the furnace 30.
  • the burner can be tilted, i.e., can be posi ⁇ tioned in different angles relative to the horizontal and the vertical.
  • the different orientations can be used for obtaining desired characteristics for the calcining process.
  • dust is supplied to the silo 42 of the feeder 40.
  • the dust used in the described process are metal-bearing solid particles.
  • the solid particles making up the dust normally have an overall diameter of less than approximately 5 millimeters, and preferably less than approximately 1 millimeter.
  • the dust fall from the silo and into the pressure ves ⁇ sel 44, wherein the pressure is maintained by means of a gas also functioning as a carrying gas, such as com- pressed air, oxygen, nitrogen or argon.
  • a gas also functioning as a carrying gas such as com- pressed air, oxygen, nitrogen or argon.
  • the dust is then carried to the oxy-fuel burner 20 at a rate, which is determined by the pressure level in the vessel 44, the amount of solid particles in the silo 42 etc.
  • the operation of the oxy-fuel burner 20 is controlled by means of the amount of fuel and oxygen supplied through the first and second supply lines 21 and 22, respectively.
  • the supply lines are connected to sources of fuel and oxygen (not shown), as is con ⁇ ventional.
  • Dust is supplied through the central feeding pipe 23 at a rate that is controlled by the feeder.
  • Fuel is supplied in the six fuel feeding pipes 21a-f, see Fig. 4, while an envelope of oxygen is supplied through the annular feeding area 22.
  • the oxy-fuel mixture results in a flame 25 having properties, such as length, tempera- ture etc., that are controlled by the supply rate of fuel and oxygen.
  • the dust is injected into the central portion of the flame 25.
  • the dust in ⁇ jected into and through the flame 25 is left unmelted by the heat of the flame, i.e., the original shape and state of aggregate of the solid particles are main- tained.
  • the solid particles remain in the flame for a very short time and under strictly controlled conditions.
  • the solid particles can remain in the flame for less than one second and more preferably less than one half second.
  • the heating of particles can be regulated so that — despite the high flame temperature - the particles are not melted but calcining is obtained.
  • the process is controlled by the ratio of solid particles supplied into the flame and the amount of fuel burnt.
  • the heating process is con ⁇ trolled by means of several parameters, of which can be mentioned: temperature and velocity of the flame 25, energy content or density of the injected solid particles, stochiometry, i.e., the ratio oxidizing gas to added fuel, the oxygen content of the oxidizing gas, the supply rate of oxygen and added fuel, the rate of injection of the dust and their character ⁇ istics, the travel time of the solid particles in the flame, and burner characteristics and configuration, such as tilting.
  • the heating of particles can be regulated so that the calcined solid particles, such as zinc oxide particles, fall to the bottom of the furnace 30, wherein they are added to the charge 34.
  • the particles can then be used as raw material for further processing.
  • the zinc oxide can be used as raw material for zinc.
  • the process is run stochiometrically or sub-stochiometrically.
  • the evaporated compounds leave the furnace 30 through one or more exhaust outlets (not shown) and are taken care of in some convenient way. It is believed that the inventive method using relatively high flame temperature breaks down some unwanted toxic compounds, such as dioxin, thereby preventing them from entering the ambient atmosphere.
  • the burner is posi ⁇ tioned in a sidewall of a furnace.
  • other suitable positions are possible, such as in the upper part of the furnace.
  • a con- figuration with more than one burner is also possible.
  • Fig. 5 yet an alternative embodiment is shown, wherein the burner 20 is provided in one end of a rotary kiln 30'.
  • an existing plant can be retrofitted with a burner at the inlet end of the kiln, providing a co-current process instead of the prior art counter-current process.
  • the solid particles are fed to the burner in the same way as in the embodiment described with reference to Fig. 2 but are transported away by the rotation of the kiln 30'.
  • the solid particles are fed to the furnace by means of a feeder.
  • the particles supplied to the furnace could also be free- flowing, carried by means of a feed gear etc.
  • a dry starting material has been shown in the figures.
  • a suitable feeding arrangement comprising a feed screw, for example.
  • the wet part is vaporized by the high temperature of the flame, resulting in exhausts rising through the furnace 30 and subsequently leaving through an exhaust outlet (not shown).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

L'invention concerne un procédé de recyclage de métaux ou de composés métalliques provenant de particules solides porteuses de métaux comprenant des composés volatiles. Ledit procédé consiste à alimenter les particules solides (50) à travers une flamme (25) d'un brûleur (20). Les composés volatiles sont ensuite évaporés par la chaleur de la flamme (25) tout en conservant la forme et l'état originaux d'agrégat des particules solides, ce qui permet ainsi d'obtenir une matière première brute (34). La matière première brute (34) est ensuite recyclée. Du fait de l'alimentation des particules solides directement vers la flamme, on obtient une installation compacte et efficace. Le procédé de fusion peut être contrôlé de manière satisfaisante, ce qui permet d'éviter la fusion des particules solides porteuses de métaux alimentées à travers le brûleur. L'invention concerne également l'utilisation d'un brûleur.
PCT/SE2005/001506 2004-10-12 2005-10-11 Procede et utilisation d'un appareil pour le recyclage de metaux ou de composes metalliques Ceased WO2006041394A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US11/574,982 US20070215019A1 (en) 2004-10-12 2005-10-11 Method and Use of an Apparatus for Recovery of Metals or Metal Compounds
EP05792438A EP1834000A1 (fr) 2004-10-12 2005-10-11 Procede et utilisation d'un appareil pour le recyclage de metaux ou de composes metalliques
BRPI0515963-6A BRPI0515963A (pt) 2004-10-12 2005-10-11 método e uso de um aparelho para recuperação de metais ou compostos metálicos
CA 2580648 CA2580648A1 (fr) 2004-10-12 2005-10-11 Procede et utilisation d'un appareil pour le recyclage de metaux ou de composes metalliques
NO20072458A NO20072458L (no) 2004-10-12 2007-05-14 Fremgangsmate og anvendelse av et apparat for utvinning av metaller eller metallforbindelser

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0402467A SE0402467D0 (sv) 2004-10-12 2004-10-12 A method and use of an apparatus for calcining
SE0402467-5 2004-10-12

Publications (1)

Publication Number Publication Date
WO2006041394A1 true WO2006041394A1 (fr) 2006-04-20

Family

ID=33434238

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2005/001506 Ceased WO2006041394A1 (fr) 2004-10-12 2005-10-11 Procede et utilisation d'un appareil pour le recyclage de metaux ou de composes metalliques

Country Status (9)

Country Link
US (1) US20070215019A1 (fr)
EP (1) EP1834000A1 (fr)
KR (1) KR20070060127A (fr)
BR (1) BRPI0515963A (fr)
CA (1) CA2580648A1 (fr)
NO (1) NO20072458L (fr)
SE (1) SE0402467D0 (fr)
WO (1) WO2006041394A1 (fr)
ZA (1) ZA200702043B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2010114611A (ru) 2007-09-14 2011-10-20 Баррик Гольд Корпорейшн (CA) Способ восстановления металлов платиновой группы с использованием восстановителей
BR112015007715A2 (pt) * 2012-10-08 2017-07-04 Air Liquide processo e aparelho para melhoria da combustão de um combustível secundário em um forno rotativo

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB265558A (en) * 1926-02-04 1927-06-09 Krupp Fried Grusonwerk Ag Improvements in or relating to processes for the treatment of zinciferous flue dust
DE551366C (de) * 1930-11-26 1932-05-30 Fried Krupp Grusonwerk Akt Ges Verfahren zur Nachverbrennung von Abgasen aus metallurgischen Prozessen
US4643110A (en) * 1986-07-07 1987-02-17 Enron, Inc. Direct fuel-fired furnace arrangement for the recovery of gallium and germanium from coal fly ash
DE4009671A1 (de) * 1990-03-26 1991-10-02 Dinda Kickdown Gmbh Verfahren zur entsorgung von klaerschlamm und dergleichen schwermetallhaltigen abfaellen
WO2001086011A1 (fr) * 2000-05-05 2001-11-15 Aga Aktiebolag Procede et dispositif destines a la recuperation de metaux

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979205A (en) * 1971-04-07 1976-09-07 Wanzenberg Fritz Walter Metal recovery method
US4551313A (en) * 1984-02-27 1985-11-05 Amax Inc. Flash sublimation and purification of molybdenum oxide
GB9316437D0 (en) * 1993-08-06 1993-09-22 Harcros Chemicals Uk Limited Zinc oxide and a process for making it
DE69520259T2 (de) * 1994-12-08 2001-08-09 Daido Tokushuko K.K., Nagoya Verfahren und Ofen zum Entsorgen von Stahlwerkabfällen sowie Betriebsverfahren für diesen Ofen
JPH09310126A (ja) * 1996-05-16 1997-12-02 Daido Steel Co Ltd 金属酸化物から金属を得る製造方法
SE522953C2 (sv) * 2001-02-22 2004-03-16 Aga Ab Sätt och anordning för behandling av slam medelst en brännare
DE10212680A1 (de) * 2002-03-22 2003-10-09 Degussa Nanoskaliges Zinkoxid, Verfahren zu seiner Herstellung und Verwendung
US20040050207A1 (en) * 2002-07-17 2004-03-18 Wooldridge Margaret S. Gas phase synthesis of nanoparticles in a multi-element diffusion flame burner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB265558A (en) * 1926-02-04 1927-06-09 Krupp Fried Grusonwerk Ag Improvements in or relating to processes for the treatment of zinciferous flue dust
DE551366C (de) * 1930-11-26 1932-05-30 Fried Krupp Grusonwerk Akt Ges Verfahren zur Nachverbrennung von Abgasen aus metallurgischen Prozessen
US4643110A (en) * 1986-07-07 1987-02-17 Enron, Inc. Direct fuel-fired furnace arrangement for the recovery of gallium and germanium from coal fly ash
DE4009671A1 (de) * 1990-03-26 1991-10-02 Dinda Kickdown Gmbh Verfahren zur entsorgung von klaerschlamm und dergleichen schwermetallhaltigen abfaellen
WO2001086011A1 (fr) * 2000-05-05 2001-11-15 Aga Aktiebolag Procede et dispositif destines a la recuperation de metaux

Also Published As

Publication number Publication date
NO20072458L (no) 2007-05-14
SE0402467D0 (sv) 2004-10-12
US20070215019A1 (en) 2007-09-20
KR20070060127A (ko) 2007-06-12
BRPI0515963A (pt) 2008-08-12
ZA200702043B (en) 2008-09-25
CA2580648A1 (fr) 2006-04-20
EP1834000A1 (fr) 2007-09-19

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