WO1998042456A1 - Appareil et procede de reduction de l'alcool utilise dans le decapage de surfaces metalliques chaudes oxydees - Google Patents

Appareil et procede de reduction de l'alcool utilise dans le decapage de surfaces metalliques chaudes oxydees Download PDF

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Publication number
WO1998042456A1
WO1998042456A1 PCT/US1998/006206 US9806206W WO9842456A1 WO 1998042456 A1 WO1998042456 A1 WO 1998042456A1 US 9806206 W US9806206 W US 9806206W WO 9842456 A1 WO9842456 A1 WO 9842456A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
cleaning
airwipe
metal surface
solution
Prior art date
Application number
PCT/US1998/006206
Other languages
English (en)
Other versions
WO1998042456A9 (fr
Inventor
Milton Edward Berry
Original Assignee
Southwire Company
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 Southwire Company filed Critical Southwire Company
Priority to EP98913270A priority Critical patent/EP0914217B1/fr
Priority to DE69819108T priority patent/DE69819108T2/de
Publication of WO1998042456A1 publication Critical patent/WO1998042456A1/fr
Publication of WO1998042456A9 publication Critical patent/WO1998042456A9/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B21B45/0278—Cleaning devices removing liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/005—Copper or its alloys

Definitions

  • the present invention generally relates to an apparatus and method for reducing consumption of alcohol used in cleaning oxidized hot metal surfaces.
  • the invention can be employed in an apparatus for continuous cleaning or pickling of cast and rolled copper rod.
  • Hot-rolled copper or copper alloy rod used in the manufacture of wire is usually formed into coils for convenient handling.
  • the rod accumulates a surface scale or oxide when exposed to the atmosphere, and this scale should be completely removed before the rod is used in the manufacture of wire.
  • the surface scale or oxide has been typically removed from the surface of copper base products by the common practice of "pickling" the products, that is, contacting their surfaces with a "pickling” liquid such as a solution including sulfuric acid, nitric acid, or other acids.
  • pickling such as a solution including sulfuric acid, nitric acid, or other acids.
  • alcohol is often used to chemically reduce the oxidized surface of continuously cast and rolled hot copper and copper alloy metal products.
  • Such alcohol is in an aqueous solution typically of about 3 % alcohol.
  • small quantities of the alcohol solution remain on the surface of the moving rod, and are usually removed with on or more blasts of air provided by an "airwipe" apparatus.
  • alcohol droplets removed from the rod as a result of the airwipe drain into a solution recovery tank for further disposition and/or recycling and reuse.
  • the present invention generally relates to an apparatus and method for reducing the consumption of alcohol used in cleaning oxidized hot metal surfaces. More particularly, the invention accomplishes that function in a method and apparatus for continuously quench-pickling cast and rolled copper and copper alloy rod in a continuous casting and rolling process. Essentially, the invention accomplishes the desired objective by providing a liquid trap in the drain line between the airwipe enclosure or box and the storage or recovery tank. This liquid trap separates the airwipe air from the liquid alcohol solution according to the typical function of a water trap.
  • the amount of alcohol solution contacted by the airwipe air is only that small amount of alcohol solution which is carried over from the pickling or cleaning tube into the airwipe, and the small surface of the liquid trap.
  • the airwipe air discharged via the normal vent tubes from the airwipe box may still require treatment by condensation of the alcohol or thermal destruction of the alcohol.
  • the quantity of alcohol carried by this air is insignificant compared to the total amount of alcohol being used and the amount of volatile alcohol carried out of the recovery tank by the air discharged into the tank in the prior art apparatus.
  • Figure 1 is a diagrammatic representation of an apparatus for the pickling or cleaning of continuously cast and rolled rod in accordance with the present invention.
  • Figure 2 is a side elevation view in cross-section of the airwipe box employed in the apparatus of Figure 1.
  • Figure 3 is an end elevation view partly in cross-section taken along line IQ- III of Figure 2 of the airwipe box employing a liquid trap in accordance with the present invention.
  • FIG. 1 is a diagrammatic representation of an apparatus for the pickling or cleaning of continuously cast and rolled rod in accordance with the present invention.
  • the apparatus 10 comprises a cleaning pipe or tube 12 and various spray boxes 14a-14h positioned at predetermined intervals along the length of the pipe 12, as well as a drain box 16 positioned at an intermediate point along the pipe 12.
  • the apparatus 10 also includes an airwipe assembly 17 with a plurality of airwipe boxes 18 disposed at the downstream end of the pipe 12, as well as pinch rolls 22 through which the rod passes prior to being delivered to a conventional rod coiler (not shown).
  • the apparatus 10 includes a storage or recovery tank 20 connected to the airwipe boxes 18 of the airwipe assembly 17 via one or more drains employing a liquid trap 19.
  • the rod being processed passes through the pipe 12, and successively past spray boxes 14a-14h.
  • Spray boxes 14a-14h spray the rod with a cleaning solution (e.g., a 3 % aqueous alcohol solution), and the drain box 16 is provided at an intermediate point of the pipe 12 for draining off excess solution.
  • a cleaning solution e.g., a 3 % aqueous alcohol solution
  • the rod Once the rod passes through each of the spray boxes 14a-14h, it enters the first airwipe box 18 where it is subjected to a blast of air at a pressure of from about 1 atm. to about 10 atm. for the purpose of removing solution droplets from the surface of the rod. These droplets are drained off via liquid trap 19 to storage or recovery tank 20. The resulting rod, with the alcohol droplets removed, passes between pinch rolls 22 and is conveyed to a rod coiler (not shown) where it is formed into coils for further disposition or transport.
  • a rod coiler not shown
  • air preferably enters the pipe 12 in such a manner as to flow in a direction opposite, i.e., countercurrent, to the direction of travel of the metal rod.
  • the blast of air introduced into pipe 12 passes through a relatively small gap between the airwipe housing and the outer surface of the metal rod, effectively removing droplets of cleaning solution from the surface of the metal rod in the process.
  • the droplets of cleaning solution fall to the bottom of the airwipe boxes 18 and are drained through trap 19 into storage or recovery tank 20.
  • Figure 2 illustrates one airwipe box 18 employed in the apparatus of Figure
  • airwipe box 18 includes air vent pipes 30 and 32, a threaded rod guide 34 mounted on the upstream side of box 18 with a slotted nut 34a, a conventional airwipe 36, liquid drain pipes 38 and 40, rod exit opening 42, and an air inlet 44 connected to the airwipe 36.
  • the metal rod enters airwipe box 18 via guide 34 and passes from left to right in Figure 2, emerging from box 18 via exit opening 42.
  • An air blast is injected into airwipe 36 via air inlet 44.
  • the air blast is directed circumferentially about the rod and flows in a direction from right to left in
  • a particular problem with the prior art apparatus is that some of the air injected through inlet 44 passes through pipes 38 and 40. As a result, such air flows across the large surface area of liquid solution collected in the storage/recovery tank 20 ( Figure 1), and this results in the removal and loss of large quantities of volatile alcohol collected in the space over the solution in the tank 20.
  • the inventive arrangement disclosed herein provides a solution to this problem. Specifically, in accordance with the invention, a liquid trap 19 is connected to drain pipes 38 and 40.
  • the liquid trap 19 is preferably in the shape of oppositely connected U-shaped tubes according to a common design of water traps .
  • air cannot escape through pipe 40 due to the fact that liquid solution collected in the trap fills the trap 19 to some level indicated by the dashed lines 56 in Figure 3.
  • liquid collected in the trap 19 prevents the air in box 18 from exhausting through drain pipes 38 and 40, flowing into tank 20, and disadvantageously removing volatile alcohol from tank 20.
  • the present invention achieves substantial savings in the overall cleaning process because of the retention of most of the collected cleaning solution.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

L'invention porte sur un appareil et un procédé de réduction de l'alcool utilisé dans une solution de décapage des surfaces métalliques chaudes oxydées de tiges métalliques coulées et laminées. On applique un jet d'air sur la surface métallique au moyen d'un dispositif de décapage pneumatique (36) de façon à éliminer les gouttelettes de la solution utilisée dans le décapage de la surface métallique oxydée, ces gouttelettes étant recueillies dans un réceptacle (18) et récupérées dans une cuve de stockage (20). Un siphon (19) est ménagé dans un tuyau d'évacuation raccordant le réceptacle (18) à la cuve de stockage (20) de façon à empêcher l'air de s'infiltrer dans la cuve de stockage (20), et évacuant les composants volatils de la solution de décapage.
PCT/US1998/006206 1997-03-27 1998-03-26 Appareil et procede de reduction de l'alcool utilise dans le decapage de surfaces metalliques chaudes oxydees WO1998042456A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98913270A EP0914217B1 (fr) 1997-03-27 1998-03-26 Appareil et procede de reduction de l'alcool utilise dans le decapage de surfaces metalliques chaudes oxydees
DE69819108T DE69819108T2 (de) 1997-03-27 1998-03-26 Gerät und verfahren zur einschränkung des alkoholverbrauchs beim reinigen von oxidierten heissen metalloberflächen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82624597A 1997-03-27 1997-03-27
US08/826,245 1997-03-27

Publications (2)

Publication Number Publication Date
WO1998042456A1 true WO1998042456A1 (fr) 1998-10-01
WO1998042456A9 WO1998042456A9 (fr) 1999-03-04

Family

ID=25246067

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/006206 WO1998042456A1 (fr) 1997-03-27 1998-03-26 Appareil et procede de reduction de l'alcool utilise dans le decapage de surfaces metalliques chaudes oxydees

Country Status (3)

Country Link
EP (1) EP0914217B1 (fr)
DE (1) DE69819108T2 (fr)
WO (1) WO1998042456A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2194565A (en) * 1938-03-05 1940-03-26 Kennecott Wire And Cable Compa Device and method for cleaning or drying wire and other strand material
US3270364A (en) * 1964-08-12 1966-09-06 Maurice G Steele Air wipe device for wire
US4391016A (en) * 1980-10-14 1983-07-05 Kabushiki Kaisha Kobe Seiko Sho Degreasing apparatus for elongated materials
US4461654A (en) * 1982-03-09 1984-07-24 Wire Lab Company Method for removing scale dust from steel rod after mechanical descaling
US4591390A (en) * 1981-03-25 1986-05-27 Shell Internationale Research Maatschappij B. V. Cable cleaning system

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3433683A (en) * 1967-01-06 1969-03-18 Ohio Crankshaft Co Heat treating method
US3620853A (en) * 1969-11-25 1971-11-16 Anaconda Wire & Cable Co Descaling copper rods
GB1323308A (en) * 1970-11-19 1973-07-11 Z Tashkent Kabel Method of reduction of an oxidized surface of copper or its alloys
GB1424325A (en) * 1972-06-20 1976-02-11 Bicc Ltd Manufacture of copper rod
BE843167A (fr) * 1975-06-24 1976-10-18 Refroidissement et decapage d'un fil machine lamine en continu
JPS5474232A (en) * 1977-11-25 1979-06-14 Furukawa Electric Co Ltd:The Surface cleaning of copper material
JPS5773189A (en) * 1980-10-27 1982-05-07 Furukawa Electric Co Ltd:The Method for continuous descaling of copper type rolled and roughly drawn wire
JPS5825482A (ja) * 1981-08-05 1983-02-15 Hitachi Seisen Kk 荒引線の洗浄方法
US4899798A (en) * 1988-11-28 1990-02-13 Southwire Company Method of and apparatus for recovering and reusing organic pickling vapors
JPH03240982A (ja) * 1990-02-19 1991-10-28 Showa Electric Wire & Cable Co Ltd 銅製押出成型品の製造法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2194565A (en) * 1938-03-05 1940-03-26 Kennecott Wire And Cable Compa Device and method for cleaning or drying wire and other strand material
US3270364A (en) * 1964-08-12 1966-09-06 Maurice G Steele Air wipe device for wire
US4391016A (en) * 1980-10-14 1983-07-05 Kabushiki Kaisha Kobe Seiko Sho Degreasing apparatus for elongated materials
US4591390A (en) * 1981-03-25 1986-05-27 Shell Internationale Research Maatschappij B. V. Cable cleaning system
US4461654A (en) * 1982-03-09 1984-07-24 Wire Lab Company Method for removing scale dust from steel rod after mechanical descaling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0914217A4 *

Also Published As

Publication number Publication date
EP0914217B1 (fr) 2003-10-22
DE69819108D1 (de) 2003-11-27
EP0914217A4 (fr) 2000-07-12
DE69819108T2 (de) 2004-07-15
EP0914217A1 (fr) 1999-05-12

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