EP0328996A1 - Verfahren und Vorrichtung zur Reinigung von gebrauchten Anoden - Google Patents

Verfahren und Vorrichtung zur Reinigung von gebrauchten Anoden Download PDF

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Publication number
EP0328996A1
EP0328996A1 EP19890102083 EP89102083A EP0328996A1 EP 0328996 A1 EP0328996 A1 EP 0328996A1 EP 19890102083 EP19890102083 EP 19890102083 EP 89102083 A EP89102083 A EP 89102083A EP 0328996 A1 EP0328996 A1 EP 0328996A1
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EP
European Patent Office
Prior art keywords
anode
board
cleaning
impact
grate
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.)
Granted
Application number
EP19890102083
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English (en)
French (fr)
Other versions
EP0328996B1 (de
Inventor
Einar Bakke
Paul Mikael Holmberg
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.)
Norsk Hydro ASA
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Norsk Hydro ASA
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Publication date
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Application filed by Norsk Hydro ASA filed Critical Norsk Hydro ASA
Publication of EP0328996A1 publication Critical patent/EP0328996A1/de
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
    • C25C3/12—Anodes
    • C25C3/125—Anodes based on carbon

Definitions

  • the present invention relates to a method and an apparatus for cleaning of spent anodes and more particularly, the cleaning of prebaked anode butts (residues) from an electro­lytic smelting process for aluminium production.
  • a prebaked anode consists of an already calcined carbon block provided with holes in the top where an aluminium/steel current-providing rod is fastened to the anode by means of cast iron or so-called rodding-mix.
  • the anode rod normally consists of from 2 to 6 vertical cylind­rical steel nipples connected together by a top steel cross-­bar which in turn is connected to a vertical aluminium rod.
  • the carbon blocks are consumed during the electrolysis pro­cess, and consequently each of the 20-30 anodes in the elec­trolysis cell has to be replaced when the anode thickness is reduced to approximately 20% of its original height.
  • the top of the anode block is then covered by a thick layer of solidified bath which sticks to the above mentioned nipples and between the carbon block and the steel cross-bar.
  • This bath layer crust
  • consisting of a solidified mixture hav­ing variable content of cryolite, aluminium fluoride and alumina can be extremely hard. Both bath material and carbon residues have to be separately recovered for re­cycling in the electrolysis process.
  • Another object of the invention is to provide an apparatus and a method satisfying the strict environmental require­ments with regard to the dust and noise level in workshops.
  • the disclosed cleaning machine is situated in a closed chamber 10 built of sound-insulating material and provided with a powerful vent-hood (not shown on the Figures), so that the machine is noise- and dust-insulated from the sur­roundings.
  • the anode rod assembly 1 comprising an aluminium rod 11, attached to carriers in an overhead conveyor is fed into the cleaning chamber.
  • the aluminium rod 11 is connected to a steel cross-bar 12, provided with welded nipples 13, em­bedded by solidified bath 21, on the top of the anode butt 2.
  • a clamping device 3 grasps the aluminium rod and pro­vides transport and alignment of the anode assembly through the machine in the cleaning chamber.
  • the cleaning machine itself comprises an impact tool 7, a dolly 4 provided with an aligning arm 6 and a vertically movable grate board 5 providing support for the anode during the cleaning operation.
  • the impact tool 7 is illustrated on the Figure as a pendulous hammer, e.g. pneumatically powered hammer.
  • the lower part of the chamber is intentionally narrowed into a hopper and terminated by transport means, e.g. a conveyor 9 for removal of bath lumps from the disintegrated bath layer 21.
  • transport means e.g. a conveyor 9 for removal of bath lumps from the disintegrated bath layer 21.
  • Fig. 2 shows the machine in a longitudinal cross-section taken along the line I-I in Fig. 1 and illustrates in more details a preferred embodiment of the grate board and the pendulous hammer 7.
  • the hammers are shown as two separate oscillating hammers which aim their impact outside of the three steel nipples 13 connected to the cross-bar 12 being in its turn attached to the rod 11, and at the solidified bath surrounding the nipples between the cross-bar and the anode butt.
  • the impact surfaces 71 of the hammers have a butt configuration without any acute or oblong parties so that the impact energy of the hammers is fully utilized.
  • the vertically movable board 5 is intentionally designed as a grate or gitter. Some of the gitter parts are furthermore intentionally provided as longitudinally extending ribs 53 protruding in the vertical direction so that during the downward movement of the board these ribs will co-operate with a stationary grate and break any possible larger lumps of the disintegrated bath layer.
  • Anode butts 2 are fastened through their aluminium rods 11 to a transport means, e.g. suspended rails which convey the anodes into the closed chamber 10.
  • Clamping device 3 grasps the aluminium rod and pulls the anode pass­ing a rotating tool, e.g. a milling cutter, which removes possible bath depositions from the cross-bar 12 on its dolly side.
  • Fig. 3 illustrates schematically the rotating device 18 comprising several parallel arranged and vertically adapted rotating discs to provide a profiled groove along the cross-­bar 12 and the nipples 13 in the bath layer 21 so that the dolly 4 can be aligned close to the nipples under the dis­integration step of the operation.
  • a restraining arm 6 grasps the cross-bar 12 on the hanger 1 and simultaneously the grate board 5 lifts the anode against the restraining arm which clamps the cross-bar against the dolly 4. In this manner a proper fixation of the anode butt, both vertically and horizontally, is achieved.
  • the dolly is dimensioned with regard to the applied impact force of the impact tool (the hammers) and is shielded from vibration by means of inserted blocks 42.
  • the two shown pneumatic hammers 7 are sequence controlled and each hammer has its individual steering with regard to the number of strokes against the solidified bath 21 between the cross-bar 12 and the anode 2. Because of the butt shape of the impact surfaces of the hammers the impact energy of the oscillating hammers is exploited maximally.
  • the bath layer 21 is disintegrated and thrown outside of the anode and the grate board 5, being collected in the hopper shaped lower part of the chamber 10 and conveyed out of the chamber, e.g. by means of a conveyor 9.
  • the restraining arm 6 is released from the cross-bar, the grate board 5 goes down and simultaneously larger bath lumps being retained on the stationary grate 55 are crushed under the movement of the board.
  • the anode is released from the fastening means 3 and is conveyed further inwardly into the chamber or to a next chamber for a possible additional post-cleaning step by means of conventional means like sand blasting, rotating brushes etc.
  • the tilting board 8 is turned to a horizontal posi­tion.
  • the grate board is elevated to a level corresponding to the surface of the tilting board and a pusher 15 trans­fers possible broken carbon pieces from the anode on the tilting board.
  • the pusher, the grate board and the tilting board are retracted to their start positions, the carbon rests fall down on a conveyor or a hopper (not shown on the Figures) and the machine is automatically reset to receive the next anode.
  • the apparatus hereby automatically ensures an efficient separation of bath residues from the carbon residues which currently represents a problem for the hitherto known cleaning installations and machines.

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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)
  • Electrolytic Production Of Metals (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Secondary Cells (AREA)
EP19890102083 1988-02-15 1989-02-07 Verfahren und Vorrichtung zur Reinigung von gebrauchten Anoden Expired EP0328996B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO880649 1988-02-15
NO880649A NO164114C (no) 1988-02-15 1988-02-15 Fremgangsmaate og anordning for rensing av anoderester.

Publications (2)

Publication Number Publication Date
EP0328996A1 true EP0328996A1 (de) 1989-08-23
EP0328996B1 EP0328996B1 (de) 1992-11-04

Family

ID=19890665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890102083 Expired EP0328996B1 (de) 1988-02-15 1989-02-07 Verfahren und Vorrichtung zur Reinigung von gebrauchten Anoden

Country Status (4)

Country Link
EP (1) EP0328996B1 (de)
CA (1) CA1315535C (de)
DE (1) DE68903339T2 (de)
NO (1) NO164114C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103056118A (zh) * 2013-01-21 2013-04-24 广西强强碳素股份有限公司 一种全自动预焙阳极炭块开槽清理机组
CN109112574A (zh) * 2018-10-18 2019-01-01 陈剑 一种铝电解槽的预焙阳极离线接续工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106637303A (zh) * 2016-11-16 2017-05-10 贵州莱利斯机械设计制造有限责任公司 一种双残余阳极的破碎方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032525A1 (de) * 1980-08-29 1982-03-11 Hamburger Aluminium-Werk GmbH, 2103 Hamburg Vorrichtung zur reinigung von anodenresten
EP0076441A2 (de) * 1981-10-06 1983-04-13 Norsk Hydro A/S Verfahren und Vorrichtung zum Aufbrechen erstarrten Badmaterials auf den Resten vorgeformter Anoden von Aluminiumelektrolysezellen
US4418435A (en) * 1982-03-22 1983-12-06 Alumax, Inc. Carbon butt cleaning apparatus and method
DE3510523A1 (de) * 1984-03-26 1985-10-03 Almeq Norway A/S, Oslo Verfahren und vorrichtung zum reinigen von abgebrannten anoden aus einem fuer die herstellung von aluminium verwendeten elektrolyse-schmelzofen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032525A1 (de) * 1980-08-29 1982-03-11 Hamburger Aluminium-Werk GmbH, 2103 Hamburg Vorrichtung zur reinigung von anodenresten
EP0076441A2 (de) * 1981-10-06 1983-04-13 Norsk Hydro A/S Verfahren und Vorrichtung zum Aufbrechen erstarrten Badmaterials auf den Resten vorgeformter Anoden von Aluminiumelektrolysezellen
US4418435A (en) * 1982-03-22 1983-12-06 Alumax, Inc. Carbon butt cleaning apparatus and method
DE3510523A1 (de) * 1984-03-26 1985-10-03 Almeq Norway A/S, Oslo Verfahren und vorrichtung zum reinigen von abgebrannten anoden aus einem fuer die herstellung von aluminium verwendeten elektrolyse-schmelzofen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103056118A (zh) * 2013-01-21 2013-04-24 广西强强碳素股份有限公司 一种全自动预焙阳极炭块开槽清理机组
CN109112574A (zh) * 2018-10-18 2019-01-01 陈剑 一种铝电解槽的预焙阳极离线接续工艺
CN109112574B (zh) * 2018-10-18 2019-12-06 珠海华唐隆鑫科技有限公司 一种铝电解槽的预焙阳极离线接续工艺

Also Published As

Publication number Publication date
NO164114B (no) 1990-05-21
DE68903339D1 (de) 1992-12-10
DE68903339T2 (de) 1993-03-18
NO880649L (no) 1989-08-16
NO164114C (no) 1990-08-29
NO880649D0 (no) 1988-02-15
CA1315535C (en) 1993-04-06
EP0328996B1 (de) 1992-11-04

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