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EP1721021B1 - Recyclage de bain de zincage a chaud - Google Patents

Recyclage de bain de zincage a chaud Download PDF

Info

Publication number
EP1721021B1
EP1721021B1 EP05715245A EP05715245A EP1721021B1 EP 1721021 B1 EP1721021 B1 EP 1721021B1 EP 05715245 A EP05715245 A EP 05715245A EP 05715245 A EP05715245 A EP 05715245A EP 1721021 B1 EP1721021 B1 EP 1721021B1
Authority
EP
European Patent Office
Prior art keywords
zinc
bath
iron
matte
alloy
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.)
Expired - Lifetime
Application number
EP05715245A
Other languages
German (de)
English (en)
Other versions
EP1721021A1 (fr
Inventor
Michael Gilles
Roger Pankert
Richard Sokolowski
Mathieu Eerdekens
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.)
Umicore NV SA
Original Assignee
Umicore NV SA
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 Umicore NV SA filed Critical Umicore NV SA
Priority to EP05715245A priority Critical patent/EP1721021B1/fr
Priority to PL05715245T priority patent/PL1721021T3/pl
Publication of EP1721021A1 publication Critical patent/EP1721021A1/fr
Application granted granted Critical
Publication of EP1721021B1 publication Critical patent/EP1721021B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/16—Regeneration of process solutions
    • C25D21/18—Regeneration of process solutions of electrolytes

Definitions

  • the present invention relates to a process to recover zinc from zinc-containing residues or scraps, especially from scraps produced by hot-dip galvanizing lines.
  • This process is typically applied to a secondary zinc product, such as top dross from hot-dip galvanizing baths, preferably after the removal of any solids remaining on zinc bath upon melting.
  • the binary system Al-Si has an eutectic composition with 11.7 wt% Si, having a minimum melting temperature of 577°C. At higher or lower Si concentrations, the melting temperature increases rapidly. In practice, it shows that only binary alloys close to this eutectic composition melt easily in molten zinc. Other binary Al-Si alloys only dissolve after very long mixing time or must be melted at high temperature. Besides higher energy consumption, higher temperatures are very inconvenient since the vapor pressure of zinc becomes significant above 600°C, leading to considerable evaporation of zinc. Therefore, in practice, from all binary Al-Si alloys, only those alloys containing between 10 wt% Si and 15 wt% Si are appropriate to remove Fe from zinc or zinc alloy. It follows that, when using an Al-Si alloy, the molten zinc temperature should preferably be above the melting point of the alloy, which is about 580 °C, as this ensures rapid mixing with the zinc.
  • the introduction of aluminium in the zinc may be considered as a drawback, e.g. when the de-ironed zinc is to be used in a specific low aluminium hot-dip galvanization process.
  • a Ni-Si alloy composed of 60-70 wt% Ni and 30-40 wt% Si is preferred.
  • SiCl 4 is also suitable as a silicon source. This volatile compound can be injected as a gas through the zinc melt where it immediately reacts to form very finely dispersed elemental silicon which dissolves and reacts readily with iron, thereby forming ZnCl 2 .
  • the process is preferably carried out at a bath temperature between 480 and 700 °C. Too low a temperature results in prohibitively slow reaction kinetics, while too high a temperature results in increasing zinc losses through evaporation. A bath temperature limited to 600 °C is even more advisable to render the process more energy efficient.
  • the reaction can be accelerated by mixing the melt by hand, with a mixer, or by the electromagnetic stirring effect typically generated by an induction furnace.
  • the latter increases the reaction rate of silicon in a significant way.
  • the Fe-Si matte formed will rise and float on the surface of the zinc bath, from where it can easily be removed.
  • the invented process allows for the removal of iron down to 0.002 wt%, or even down to 0.001 wt% in the zinc bath. Such results are to be considered as excellent.
  • the iron concentration in a 2000 kg zinc alloy melt is reduced from 0.025 to 0.010 w% by adding 3.4 kg of a 65 wt% Ni - 35 wt% Si binary alloy.
  • Ni-Si is advantageously added as finely crushed material, with particles smaller than 3mm. These particles are immersed in a perforated bulb to prevent them from floating on top of the melt. After 20 minutes of mixing and 5 minutes of decanting, the resulting Fe-Si floating to the surface of the bath is skimmed off. Spreading NH 4 Cl on the surface before skimming can reduce considerably the amount of zinc that is entrained with the Fe-Si.
  • the iron-containing zinc or zinc alloy is molten, and a sample is taken to determine its iron concentration. Sampling can also be performed on the feed to the melting furnace. The amount of molten metal in the furnace can be determined from the level of the melt in the furnace or by weighing. The total quantity of iron in the melt can thus be calculated. This amount is used to determine the needed quantity of reagents (Ni-Si, Al-Si or SiCl 4 ). The useful Si to Fe weight ratio can vary between 0.5 and 6, since the yield of the reaction will depend on the temperature and on the degree of mixing. Less efficient mixing and lower temperatures will result in increased reagent needs.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Coating With Molten Metal (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Silicon Compounds (AREA)

Claims (6)

  1. Procédé pour retirer le fer d'un bain de zinc fondu, lequel procédé comprend les étapes qui consistent à :
    - ajouter un alliage de Ni-Si au bain de zinc, le fer présent dans le bain de zinc réagissant avec ledit composé afin de produire une matte de Fe-Si,
    - laisser sédimenter le bain de Zn, la matte de Fe-Si remontant vers la surface du bain et
    - recueillir la matte de Fe-Si de la surface du bain de zinc.
  2. Procédé selon la revendication 1, dans lequel le zinc fondu est un produit de zinc secondaire.
  3. Procédé selon la revendication 2, qui comprend une étape de traitement préliminaire au cours de laquelle les solides flottant sur le bain de zinc fondu sont retirés avant l'ajout du composé contenant du Si.
  4. Procédé selon la revendication 3, dans lequel le produit de zinc secondaire comprend des déchets flottants qui proviennent du bain de galvanisation.
  5. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel l'alliage Ni-Si est composé de 60 à 70 % en poids de Ni et de 30 à 40 % en poids de Si.
  6. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel le bain de zinc fondu est maintenu à une température comprise entre 480 et 700° C.
EP05715245A 2004-02-26 2005-02-01 Recyclage de bain de zincage a chaud Expired - Lifetime EP1721021B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05715245A EP1721021B1 (fr) 2004-02-26 2005-02-01 Recyclage de bain de zincage a chaud
PL05715245T PL1721021T3 (pl) 2004-02-26 2005-02-01 Odzyskiwanie z kąpieli do cynkowania

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP04075589 2004-02-26
US54827304P 2004-03-01 2004-03-01
EP05715245A EP1721021B1 (fr) 2004-02-26 2005-02-01 Recyclage de bain de zincage a chaud
PCT/EP2005/001054 WO2005083134A1 (fr) 2004-02-26 2005-02-01 Recyclage de bain chaud de galvanisation de zinc

Publications (2)

Publication Number Publication Date
EP1721021A1 EP1721021A1 (fr) 2006-11-15
EP1721021B1 true EP1721021B1 (fr) 2007-06-06

Family

ID=34928101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05715245A Expired - Lifetime EP1721021B1 (fr) 2004-02-26 2005-02-01 Recyclage de bain de zincage a chaud

Country Status (6)

Country Link
EP (1) EP1721021B1 (fr)
AT (1) ATE364097T1 (fr)
DE (1) DE602005001323T2 (fr)
ES (1) ES2287903T3 (fr)
PL (1) PL1721021T3 (fr)
WO (1) WO2005083134A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2389809C1 (ru) * 2008-09-29 2010-05-20 Алексей Иванович Гончаров Способ очистки цинкосодержащего сырья от оксидов примесных металлов, примесных металлов и печь для осуществления способа
CN103003018A (zh) * 2010-03-16 2013-03-27 法国原子能及替代能源委员会 用于通过具有添加加强物的非反应性钎焊接合由SiC为基础的材料制成的部件的方法，钎焊组合物以及通过所述方法获得的接合部和组件

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2957543B1 (fr) 2010-03-16 2012-07-27 Commissariat Energie Atomique Procede d'assemblage de pieces en materiaux a base de sic par brasage non-reactif, compositions de brasure, et joint et assemblage obtenus par ce procede.
FR2957542B1 (fr) 2010-03-16 2012-05-11 Commissariat Energie Atomique Procede d'assemblage de pieces en materiaux a base de sic par brasage non-reactif, compositions de brasure, et joint et assemblage obtenus par ce procede.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB739161A (en) * 1952-10-06 1955-10-26 British Iron Steel Research A new or improved process for the recovery of zinc from dross
BE759638A (fr) * 1969-12-13 1971-04-30 Duisburger Kupferhuette Procede d'elimination des metaux accessoires du zinc metallique
US3902894A (en) * 1971-08-12 1975-09-02 Juan Blas Sitges Menendez Refining process for zinc recovery
DE3734204A1 (de) * 1987-10-09 1989-04-20 Solms Juergen Verfahren zur verringerung des eisengehaltes von zinschmelzen
DE3911060A1 (de) * 1989-04-06 1990-10-11 Solms Juergen Verfahren zur verringerung des eisengehaltes von zinkschmelzen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2389809C1 (ru) * 2008-09-29 2010-05-20 Алексей Иванович Гончаров Способ очистки цинкосодержащего сырья от оксидов примесных металлов, примесных металлов и печь для осуществления способа
CN103003018A (zh) * 2010-03-16 2013-03-27 法国原子能及替代能源委员会 用于通过具有添加加强物的非反应性钎焊接合由SiC为基础的材料制成的部件的方法，钎焊组合物以及通过所述方法获得的接合部和组件

Also Published As

Publication number Publication date
WO2005083134A1 (fr) 2005-09-09
ES2287903T3 (es) 2007-12-16
DE602005001323T2 (de) 2008-02-07
PL1721021T3 (pl) 2007-10-31
ATE364097T1 (de) 2007-06-15
EP1721021A1 (fr) 2006-11-15
DE602005001323D1 (de) 2007-07-19

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