EP0931860A1 - Appareillage pour le traitement électrolytique de fils ferreux et non ferreux - Google Patents

Appareillage pour le traitement électrolytique de fils ferreux et non ferreux Download PDF

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Publication number
EP0931860A1
EP0931860A1 EP97830747A EP97830747A EP0931860A1 EP 0931860 A1 EP0931860 A1 EP 0931860A1 EP 97830747 A EP97830747 A EP 97830747A EP 97830747 A EP97830747 A EP 97830747A EP 0931860 A1 EP0931860 A1 EP 0931860A1
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EP
European Patent Office
Prior art keywords
station
metal wires
pickling
crystalization
bath
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.)
Withdrawn
Application number
EP97830747A
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German (de)
English (en)
Inventor
Alberto Giovanni Rusconi
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.)
Otomec Srl
Original Assignee
Otomec Srl
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 Otomec Srl filed Critical Otomec Srl
Priority to EP97830747A priority Critical patent/EP0931860A1/fr
Publication of EP0931860A1 publication Critical patent/EP0931860A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
    • C25F7/02—Regeneration of process liquids

Definitions

  • the present invention relates to an apparatus for electrically treating ferrous and nonferrous metal wires in line with a drawing apparatus.
  • a first method is mechanical descaling by twisting the metal; the second method is brushing, performed by mechanical removal with steel brushes; finally, a third method is grit blasting.
  • a chemical removal method is also known in which the entire metal is immersed in a bath having a suitable concentration.
  • An aim of the present invention is therefore to provide an apparatus for electrically treating ferrous and nonferrous metal wires, in line with a drawing apparatus, which considerably reduces the rate of replacement of the chemical bath in which the metal wires to be treated are immersed.
  • An object of the present invention is to provide an apparatus for electrically treating ferrous and nonferrous metal wires, in line with a drawing apparatus, in which it is possible to recover, in a different form, the material produced by pickling.
  • a further object of the present invention is to provide an apparatus for electrically treating ferrous and nonferrous metal wires, in line with a drawing apparatus, provided with a means for suppressing toxic fumes produced by the chemical treatment to which the wire being processed is subjected.
  • a further object of the present invention is to provide an apparatus for electrically treating ferrous and nonferrous metal wires, in line with a drawing apparatus, which is highly reliable, relatively easy to provide and at competitive costs.
  • an apparatus for electrically treating ferrous and nonferrous metal wires in line with a drawing apparatus, comprising: a station for descaling and brushing a layer of oxides and calamine that is present on the metal wires that enter the apparatus; at least one station for electrolytic pickling by adjustable retention in a bath of acid or basic solution; at least one washing station; and at least one station for the further treatment of the wire that exits from the washing station before being sent to a drawing apparatus; characterized in that it furthermore comprises at least one crystalization device which is suitable to keep the concentration of the substances descaled from the metal wires below a preset value in order to extend the useful life of the pickling bath that is present in the pickling station.
  • the apparatus includes, preferably in sequence: a first descaling and brushing station 2; a station 3 for pickling by immersion in a chemical bath; a washing station 4; a phosphatizing and copper-plating station 5; and a borax coating station 6.
  • the metal wire introduced in the descaling and brushing station 2 finally exits from the borax coating station 6 to be introduced in a wiredrawing machine, not shown in the figures.
  • the descaling and brushing station has a series of mutually opposite rollers 7 which descale and brush the wire that enters the apparatus, with a blower which collects the removed material.
  • the descaling and brushing station includes at least two pairs of rollers 7, of which at least two have an abrasive surface and have a brushing action, arranged along two axes.
  • the forced-air blower removes the finer residues produced by descaling and brushing and conveys them to a specifically provided container 10.
  • the subsequent pickling station includes a treatment tank 8, having a self-supporting structure made of acid-resistant material, and sets of rollers for guiding and advancing the wire 11 which are actuated by the pneumatic cylinders.
  • the pickling station 3 also includes a device 9 for cathode/anode contact or bipolar effect without contact or with alternating contact for the electrical treatment of the wires that enter the apparatus according to the invention.
  • This effect is achieved by means of a crystalization device, designated by the reference numeral 20, which separates the solidified solute from the solvent liquid that dissolves it (that is to say, the acid or basic solution contained in the pickling tank 8).
  • the metal wires are sent to the washing station 4 that follows.
  • the crystalization device includes a collecting pump 21 which collects the contaminated acid solution and feeds it into a secondary collection tank 22 by which the contaminated solution is cooled, by virtue of a heat exchanger 23, down to approximately 3-4 °C to form ferrous sulfates in the form of crystals.
  • the crystals are fed into a settling/separator unit 24, in which a scraper blade 25 separates the liquid part from the crystals; the liquid part is pure acid, which is to be fed back into the acid bath in the pickling tank 8.
  • the crystals separated out of the solution are collected in a suitable filtering bag made of polypropylene for additional filtration or separation of the acid from the crystals, in order to obtain dry crystals as described above.
  • a device 27 for suppressing and neutralizing the vapors of the treatment liquids by virtue of a fan 28 which produces negative pressure in the apparatus according to the invention, and nozzles which feed water for suppression from the upper region of the columns, designated by the reference numeral 29, by means of a pump 30'.
  • a device 30 for concentrating the wash water by evaporation which concentrates the pollutants (sulfates and iron) and returns them to the previous crystalization process and produces demineralized water to be reused for the washes in a closed circuit.
  • the device consists of a cylindrical tank 31 made of acid-resistant material and placed in vacuum by a pump 32.
  • the wash water to be evaporated is fed into the tank 31, and inside there is a coil in which compressed gas flows, causing the wash water to boil.
  • Distilled water forms in the upper part of the device 30 and the concentrate to be evacuated in the crystalization device 20 forms in the lower part.
  • the wire is brushed with at least two brushes made of plastic whose rotation rate is adjustable.
  • the effectiveness of the washes applied to the wire is increased by a pressure pump which sprays water with great force onto the wire.
  • the phosphatizing station 5 and the borax descaling station 6 have indirect-diffusion heat exchangers which are immersed in diathermic oil for heating above 70°C.
  • the reference numeral 35 designates a forced air source which dries the wire that exits from the borax descaling station or in any case exits from the last processing station through which the wire is passed.
  • the borax coating and phosphatizing stations can in fact be present in combination, or there may be a copper-plating and borax coating station, or there may be a zinc-plating and borax coating station or there may be just a single borax coating station.
  • the apparatus according to the invention fully achieves the intended aim, since it allows to recycle the chemical pickling solution when it becomes contaminated owing to the residues left by the metal wires that are immersed in it.
  • the crystalization device allows to "clean" the acid solution and recover the iron sulfates eliminated by the metal wires to convert them to a crystal form.
  • the device for suppressing the vapors of the treatment liquids to which the metal wire allows to reduce the pollution produced by the apparatus according to the invention.
  • the vapor suppression device is combined with the device for concentrating the wash water by evaporation, allowing to reduce the overall pollution of the apparatus.
  • the rollers for the advancement of the wire 7 and in general all the rollers that are present in the apparatus according to the invention can be arranged so that instead of having a rotation axis which is parallel to the resting surface of the apparatus they have a rotation axis which is perpendicular to the resting surface, so as to reduce the bulk of the apparatus.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
EP97830747A 1997-12-31 1997-12-31 Appareillage pour le traitement électrolytique de fils ferreux et non ferreux Withdrawn EP0931860A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97830747A EP0931860A1 (fr) 1997-12-31 1997-12-31 Appareillage pour le traitement électrolytique de fils ferreux et non ferreux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97830747A EP0931860A1 (fr) 1997-12-31 1997-12-31 Appareillage pour le traitement électrolytique de fils ferreux et non ferreux

Publications (1)

Publication Number Publication Date
EP0931860A1 true EP0931860A1 (fr) 1999-07-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97830747A Withdrawn EP0931860A1 (fr) 1997-12-31 1997-12-31 Appareillage pour le traitement électrolytique de fils ferreux et non ferreux

Country Status (1)

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EP (1) EP0931860A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7824533B2 (en) 2004-10-25 2010-11-02 Industrial Door Co., Inc. Tempered plated wire and methods of manufacture

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900955A (en) * 1973-10-15 1975-08-26 Joseph C Peterson Apparatus for recovering sulfuric acid and ferrous sulfate crystals from spent pickle solution
US4201650A (en) * 1977-03-22 1980-05-06 Sumitomo Metal Industries, Ltd. Apparatus for continuous electrolytic descaling of steel wire with mill scales
US4276133A (en) * 1978-09-21 1981-06-30 Sumitomo Industries, Ltd. Method for continuous electrolytic descaling of steel wire by non-contact current flow
DE19521132C1 (de) * 1995-06-09 1996-10-17 Poligrat Holding Gmbh Verfahren zum Entmetallisieren von hochsauren Bädern und Verwendung dieses Verfahrens beim Elektropolieren von Edelstahloberflächen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3900955A (en) * 1973-10-15 1975-08-26 Joseph C Peterson Apparatus for recovering sulfuric acid and ferrous sulfate crystals from spent pickle solution
US4201650A (en) * 1977-03-22 1980-05-06 Sumitomo Metal Industries, Ltd. Apparatus for continuous electrolytic descaling of steel wire with mill scales
US4276133A (en) * 1978-09-21 1981-06-30 Sumitomo Industries, Ltd. Method for continuous electrolytic descaling of steel wire by non-contact current flow
DE19521132C1 (de) * 1995-06-09 1996-10-17 Poligrat Holding Gmbh Verfahren zum Entmetallisieren von hochsauren Bädern und Verwendung dieses Verfahrens beim Elektropolieren von Edelstahloberflächen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7824533B2 (en) 2004-10-25 2010-11-02 Industrial Door Co., Inc. Tempered plated wire and methods of manufacture

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