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WO1995021945A1 - Procede permettant d'eliminer des halogenes d'un materiau contenant du zinc - Google Patents

Procede permettant d'eliminer des halogenes d'un materiau contenant du zinc Download PDF

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Publication number
WO1995021945A1
WO1995021945A1 PCT/SE1995/000154 SE9500154W WO9521945A1 WO 1995021945 A1 WO1995021945 A1 WO 1995021945A1 SE 9500154 W SE9500154 W SE 9500154W WO 9521945 A1 WO9521945 A1 WO 9521945A1
Authority
WO
WIPO (PCT)
Prior art keywords
zinc
fumes
halogens
temperature
collected
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/SE1995/000154
Other languages
English (en)
Inventor
Bror Erik SKÖLD
Guozhu Ye
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.)
ODDA RECYCLING AS
Original Assignee
ODDA RECYCLING AS
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 ODDA RECYCLING AS filed Critical ODDA RECYCLING AS
Priority to AU18289/95A priority Critical patent/AU1828995A/en
Publication of WO1995021945A1 publication Critical patent/WO1995021945A1/fr
Anticipated expiration legal-status Critical
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
    • C22B19/30—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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/02—Preliminary treatment of ores; Preliminary refining of zinc oxide
    • 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 to a method of removing halogens from a zinc containing material by a sulphatizing process.
  • Dust from electric arc furnaces contains usually 25 - 35 % Fe and 25 - 35 % Zn.
  • the zinc comes from the melting of galvanised steel.
  • the dust contains usually 1-10 % Cl and 0.2-1.5 % F that come from paint.
  • the halogens are usually in an insoluble form and cannot be removed by leaching.
  • the zinc can be collected as solid matter (mainly zinc oxide) and the halogens may pass the collection as gaseous hydrogen halides and they can be collected from the fumes that passes the collection of solid matters.
  • the halogens may be collected as solid matters (mainly alkali halides or alkalene earth metal halides) and possibly also as condensed hydrogen halides together with the zinc oxide, and the halides can be separated from the zinc oxide by a leaching process.
  • the leaching can be carried out for example with pure water or with a solution of washing soda in water. It is possible to leach since the halides generated from the sulphates are soluble.
  • the Figure shows an electric direct arc furnace 9 of the D C-type (direct current). It has an electrode 10 with a central through channel 11. From bins 12, 13 and 14 zinc containing dust, reduction agent, and slag forming agent, respectively, can be supplied to the channel 1 1 by a conveyor 15. The slag formed in the furnace and liquid iron at the bottom of the furnace 9 can be tapped through a tap hole 15.
  • the exhaust pipe 16 has an after-burner 17, with a supply pipe 18 from a non illustrated mixing chamber, and downstream the after-burner 17 there is a cooler in the form of a heat exchanger or a conditioning tower 19, a collector in the form of an electric filter 20, and a scrubber 21. From the scrubber 21, the exhaust gases are conveyed through a fan 22 to a chimney 23.
  • dust, reduction agent e.g. coal dust
  • sand are supplied to the furnace 9 via the electrode 10.
  • the hot plasma in the furnace 9 reduces and melts iron oxide to liquid hot iron or to FeO in the slag.
  • Zn and other volatile metals such as Pb evaporates.
  • the exhaust gas comprises these fumes together with CO/CO 2 .
  • a mixture compising oxygen or air, water vapour, and a sulphatizing agent such as SO 2 or SO 3 or H 2 SO is supplied through the pipe 18.
  • the temperature in the after ⁇ burner should be so high that the zinc sulphate will be unstable and the sulphatizing process will therefore be selective.
  • the temperature of combustions should preferable be above about 700°C and preferably 800 - 1000°C.
  • Zn and other evaporated metals will oxidize and halides will react as follows:
  • thermodynamic forces for transforming the halides into sulphates are great.
  • NaCl, KC1 and CaF 2 are the most stable halides that will normally be present in process fumes or ZnO-product. Tests have proved that these halides are transformed into sulphates and thus, all other halides will also be transformed into sulphates.
  • the fumes are cooled in the conditioning tower 19 by direct contact with water.
  • the temperature can be about 400°C or lower when an electric filter is used.
  • the amount of sulphatizing agent should be somewhat overstochiometric with respect to the halogens, but the amount should not be too high since zinc sulphate will then be formed during the cooling of the fumes.
  • the amount of zinc sulphate in the collected zinc oxide may in practice be a few percent, it should preferably not exceed 10 % or even 5 %. The zinc is thus collected mainly as ZnO dust.
  • the halogens can either pass the collection of solid matter as hydrogen halides in gaseous state or they can regenerate as salts and be collected as solid matters together with the metal oxides.
  • a part of the halides may pass the collection as hydrogen halides and a part of the halides may be collected as salts and the relative proportions can be controlled by the control of factors such as temperature.
  • the hydrogen halides are collected and neutralized in a conventional way in the scrubber 21 before the fumes are conveyed to the chimney 23.
  • the filter 20 and the scrubber 21 a single scrubber can be used in which a sludge is collected which is leached and dewatered.
  • the resulting dewatered filter cake comprises the halogen free zinc oxide.
  • the temperature is thus lowered directly from the reaction temperature of for example about 800°C to less than 100°C.
  • the halides collected together with the metal oxides in the filter 20 would not be soluble.
  • regenerated halides are soluble and by leaching with water or a solution of alkali carbonate in water, preferably washing soda Na 2 CO 3 , they can be removed from the collected oxides and sulphates.
  • the metal oxide dust can then be treated in conventional plants for producing zinc.
  • the sulphates will not be harmful in such a process since they will be removed in a process step that is already present in the conventional plants.

Landscapes

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

Abstract

Dans le recyclage de l'acier, la proportion d'acier galvanisé et peint ne cesse d'augmenter et le zinc est recueilli de manière générale sous forme de poussières sèches ou humides. Lorsque ces poussières sont utilisées pour d'autres applications, les halogènes provenant de la peinture posent des problèmes. Ces halogènes peuvent être séparés de l'oxyde de zinc par évaporation du zinc et des halogénures et par oxydation du zinc, ainsi que par sulfatation des halogénures. L'absence d'halogènes augmente considérablement la valeur de cet oxyde de zinc.
PCT/SE1995/000154 1994-02-15 1995-02-15 Procede permettant d'eliminer des halogenes d'un materiau contenant du zinc Ceased WO1995021945A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18289/95A AU1828995A (en) 1994-02-15 1995-02-15 A method of removing halogens from a zinc containing material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9400533A SE9400533L (sv) 1994-02-15 1994-02-15 Sätt att avlägsna halogener ur ett material
SE9400533-7 1994-02-15

Publications (1)

Publication Number Publication Date
WO1995021945A1 true WO1995021945A1 (fr) 1995-08-17

Family

ID=20392964

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1995/000154 Ceased WO1995021945A1 (fr) 1994-02-15 1995-02-15 Procede permettant d'eliminer des halogenes d'un materiau contenant du zinc

Country Status (3)

Country Link
AU (1) AU1828995A (fr)
SE (1) SE9400533L (fr)
WO (1) WO1995021945A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997000333A1 (fr) * 1995-06-15 1997-01-03 Mintek Traitement de materiaux zinciferes dans un four a arc a courant continu
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2150923A (en) * 1983-12-09 1985-07-10 Skf Steel Eng Ab Dechlorination of zinc starting-materials
EP0420525A2 (fr) * 1989-09-28 1991-04-03 AT&T Corp. Récupération de compositions contenant des métaux
EP0608695A1 (fr) * 1993-01-26 1994-08-03 Outokumpu Research Oy Procédé pour l'utilisation de sous-produits contenant du zinc et d'autres métaux de valeur

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2150923A (en) * 1983-12-09 1985-07-10 Skf Steel Eng Ab Dechlorination of zinc starting-materials
EP0420525A2 (fr) * 1989-09-28 1991-04-03 AT&T Corp. Récupération de compositions contenant des métaux
EP0608695A1 (fr) * 1993-01-26 1994-08-03 Outokumpu Research Oy Procédé pour l'utilisation de sous-produits contenant du zinc et d'autres métaux de valeur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 509, C-776; & JP,A,02 211 221 (NGK INSULATORS LTD), 22 August 1990. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997000333A1 (fr) * 1995-06-15 1997-01-03 Mintek Traitement de materiaux zinciferes dans un four a arc a courant continu
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
AP1284A (en) * 1999-02-26 2004-06-19 Mintek Treatment of metal sulphide concentrates by roasting and arc furnace smelt reduction.

Also Published As

Publication number Publication date
SE9400533D0 (sv) 1994-02-15
SE9400533L (sv) 1995-08-16
AU1828995A (en) 1995-08-29

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