EP2475807B1 - Cathode shell structure - Google Patents

Cathode shell structure Download PDF

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Publication number
EP2475807B1
EP2475807B1 EP10814008.8A EP10814008A EP2475807B1 EP 2475807 B1 EP2475807 B1 EP 2475807B1 EP 10814008 A EP10814008 A EP 10814008A EP 2475807 B1 EP2475807 B1 EP 2475807B1
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EP
European Patent Office
Prior art keywords
shell
accordance
shell structure
apertures
cathode
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.)
Active
Application number
EP10814008.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2475807A1 (en
EP2475807A4 (en
Inventor
Ingo Eick
Dirk Kroschinski
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
Application filed by Norsk Hydro ASA filed Critical Norsk Hydro ASA
Publication of EP2475807A1 publication Critical patent/EP2475807A1/en
Publication of EP2475807A4 publication Critical patent/EP2475807A4/en
Application granted granted Critical
Publication of EP2475807B1 publication Critical patent/EP2475807B1/en
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Classifications

    • 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
    • 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
    • C25C3/085—Cell construction, e.g. bottoms, walls, cathodes characterised by its non electrically conducting heat insulating parts

Definitions

  • the present invention relates to a cathode shell structure for an aluminium electrolysis cell.
  • Electrolysis cells for aluminium production based upon the Hall-Héroult principle commonly have prebaked anodes in its upper part and a cathode structure in its lower part.
  • the cathode structure comprises mainly an outer steel shell provided with vertical stiffeners and horizontal beams at its outside which are made out of steel too, the cathode structure further being provided with layers of protective and insulating material at its inside.
  • In the mainly horizontal bottom part of the cathode structure there is commonly arranged electronic conducting carbon blocks.
  • the cathode structure when in operation contains a molten aluminium metal pad and above that molten bath material having temperatures that can be approximately 970° or even higher.
  • the main feature of the outer steel shell including its stiffeners and beams is to maintain the geometric and dimensional configuration of the cathode structure during its lifetime of operation. Due to continuous chemical swelling of the cathode and lining as well the high temperatures involved and the effect this has on the properties of lining and steel components involved, several attempts have been carried out to make the steel shell structure and the configuration of stiffeners able to withstand this influence in a long lasting manner.
  • RU 2 294 404 C1 describes a cathode device of an aluminium electrolysis cell. I. Eick et al., Light Metals, TMS Annual Meeting, Proceedings of the Technical Sessions, 1999, p. 339-345 describes the dimensioning of cooling fins for high-amperage reduction cells.
  • CN 1442513 A describes heat radiating plates welded to the external surface of an electrolytic bath shell.
  • US 4087345 disclose a cathode structure designed to be cooled by natural cooling and where there are arranged ducts or passages between vertical stiffeners outside the cathode shell for allowing an upward draught of air.
  • Horizontal beams arranged as a part of the stiffening structure are arranged onto the outside of the vertical stiffeners.
  • thermal expansion and twisting or torsion based deviation of the vertical members may cause insufficient structural stability of the steel shell.
  • US 4,322,282 disclose a tank for an electrolytic cell provided with horizontal movable hollow sections secured to the sidewalls of the metal tank.
  • the sections bend inwards as a result of the temperature gradient across them such that they counter a pressure on the sidewalls due to the dilation of the cell contents, thus acting as a thermo-spring.
  • There is provided holes in opposing horizontal walls of the hollow section so as to reduce thermal conduction within the sections and thereby maintain the temperature gradient therein. The circulation of air which results, helps further to achieve and maintain the temperature difference.
  • At least one horizontal web is arranged in contact with the steel shell without intermediate vertical members that may, as a result of thermal loads, alter their geometric configuration.
  • the web has apertures facing the shell.
  • a quart of a pot shell structure 1 where the steel plates are not shown.
  • One half of an end wall 2 and correspondingly one half of a side wall 3 as well as a quart of a bottom 4 haven been disclosed.
  • the end wall comprises as its main constituents a deck plate 7, vertical stiffeners 8, 8', 8", 8"', one horizontal web 9 and a reinforcing bracing flange 10.
  • the side wall 3 comprises a deck plate 11, vertical structural elements 6, 6', 6", 6"', 6"", 6""', 6""" which in fact is a part of a cradle structure 12, together with corresponding horizontal beams 5, 5', 5", 5"', 5"", 5""', 5"”” that are fixedly interconnected with the said vertical structural elements. Further, the side wall 3 comprises a plurality of vertical stiffeners 13, 14, 15 which additionally acts as cooling fins.
  • Figure 2 discloses in a 3 D view the end wall structure 2 as partly shown in Fig. 1 , here in its full extension and where the deck plate has been removed.
  • the reinforcing bracing flange 10 represents the outermost element of the end wall structure.
  • the bracing flange is further attached to the side walls and the vertical structural element 6""" of the cradle structure closest to this end.
  • the mainly horizontal web 9 which outer periphery fits the shape of the bracing web,
  • the end wall structure further comprises vertical stiffeners 8, 8', 8", 8'", 8"", 8""', 8""".
  • the number of stiffeners is a function of the shell width and anticipating inner forces.
  • These stiffeners are integrated in the horizontal web 9 by any appropriate manufacturing method.
  • the web 9 can have slots adapted to the stiffeners that are subsequently fixed to the web, for instance by welding.
  • One other method can be to manufacture the web 9 in appropriate pieces or plates that abut the stiffeners and which subsequently are fixed to the stiffeners.
  • the vertical stiffeners are provided with a flange at their outer side. A part of such a flange is indicated at 8a' in stiffener 8', One purpose of this flange is to enhance bending and torsion stiffness in the stiffener with regard to occurring loads.
  • the inner side of the stiffener is fixed to the steel plate(s) of the pot shell by appropriate means, for instance welding.
  • the stiffeners are connected to an extension of the bottom plate of the shell (not shown), to enhance stiffness in the end wall.
  • the horizontal web 9 is provided with several holes or apertures 16, 16', 16", 16"', 16"", 16""', 16""", 16"""'. These apertures are made sufficiently wide and deep to reduce the presence of the horizontal web with regard to ventilation.
  • the apertures are made semi-circular or semi-elliptical or polygonal and are represented by discrete cut-outs at the side edge of the web.
  • the bridging or protruding parts of the web between neighbouring recesses, are connected to the pot shell by appropriate means, for instance welding.
  • end wall structure may have two horizontal webs of the type 9 that are spaced apart (not shown).
  • FIG. 4 An air flow pattern in accordance with such arrangement is shown in Fig. 4 . It can clearly be seen that the air flow is directed upwards along the shell wall and through the ventilation holes or apertures of type 16.

Landscapes

  • 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)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP10814008.8A 2009-09-07 2010-09-03 Cathode shell structure Active EP2475807B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20092968 2009-09-07
PCT/NO2010/000327 WO2011028132A1 (en) 2009-09-07 2010-09-03 Cathode shell structure

Publications (3)

Publication Number Publication Date
EP2475807A1 EP2475807A1 (en) 2012-07-18
EP2475807A4 EP2475807A4 (en) 2016-04-13
EP2475807B1 true EP2475807B1 (en) 2018-02-28

Family

ID=43649496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10814008.8A Active EP2475807B1 (en) 2009-09-07 2010-09-03 Cathode shell structure

Country Status (12)

Country Link
EP (1) EP2475807B1 (zh)
CN (1) CN102549198B (zh)
AR (1) AR078338A1 (zh)
AU (1) AU2010290196B2 (zh)
BR (1) BR112012005051B1 (zh)
CA (1) CA2773127C (zh)
EA (1) EA021620B1 (zh)
IN (1) IN2012DN01944A (zh)
NO (1) NO2475807T3 (zh)
NZ (1) NZ598998A (zh)
WO (1) WO2011028132A1 (zh)
ZA (1) ZA201201656B (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2015349579B2 (en) * 2014-11-21 2020-10-01 Hatch Ltd. Low-profile aluminum cell potshell and method for increasing the production capacity of an aluminum cell potline
NO20141572A1 (no) * 2014-12-23 2016-06-24 Norsk Hydro As En modifisert elektrolysecelle og en fremgangsmåte for modifisering av samme
US20180148852A1 (en) * 2015-05-13 2018-05-31 Pultrusion Technique Inc. Electrolytic vessel with reinforcing components
GB2572565A (en) * 2018-04-03 2019-10-09 Dubai Aluminium Pjsc Reinforced potshell design of an electrolytic cell suitable for the Hall-Héroult process

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU549513A1 (ru) * 1975-06-03 1977-03-05 Всесоюзный научно-исследовательский и проектный институт алюминиевой, магниевой и электродной промышленности Катодный кожух электролизера дл получени алюмини
US4087345A (en) * 1977-07-19 1978-05-02 Ardal Og Sunndal Verk A.S. Potshell for electrolytic aluminum reduction cell
SU1560634A1 (ru) * 1987-10-21 1990-04-30 В.Г.Жучков, А.В.Степень, В.Е.Жучкова и О.Г.Шадрина Катодный кожух алюминиевого электролизера
SU1669997A2 (ru) * 1988-02-18 1991-08-15 Государственный Ремонтно-Строительный Специализированный Трест По Ремонту, Монтажу Технологического Оборудования "Сибцветметремонт" Катодный кожух алюминиевого электролизера
CN1208502C (zh) * 2003-04-10 2005-06-29 沈阳铝镁设计研究院 一种加强大型铝电解槽槽壳散热的方法
CN2644436Y (zh) * 2003-07-18 2004-09-29 中国铝业股份有限公司 铝电解槽端头槽壳新型通风结构
RU2294404C1 (ru) * 2005-09-20 2007-02-27 Открытое акционерное общество "Сибирский научно-исследовательский, конструкторский и проектный институт алюминиевой и электродной промышленности" (ОАО "СибВАМИ") Катодное устройство алюминиевого электролизера
RU2308547C1 (ru) * 2005-12-22 2007-10-20 Общество с ограниченной ответственностью "Русская инжиниринговая компания" Катодный кожух алюминиевого электролизера
CN201010697Y (zh) * 2007-04-06 2008-01-23 东北大学设计研究院（有限公司） 一种大型铝电解槽通风散热装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
BR112012005051A2 (pt) 2016-05-03
EP2475807A1 (en) 2012-07-18
AR078338A1 (es) 2011-11-02
NZ598998A (en) 2014-01-31
EP2475807A4 (en) 2016-04-13
CA2773127C (en) 2016-11-22
ZA201201656B (en) 2012-11-28
NO2475807T3 (zh) 2018-07-28
IN2012DN01944A (zh) 2015-08-21
CA2773127A1 (en) 2011-03-10
CN102549198B (zh) 2015-12-09
EA201200453A1 (ru) 2012-09-28
AU2010290196A1 (en) 2012-03-29
AU2010290196B2 (en) 2015-12-17
EA021620B1 (ru) 2015-07-30
CN102549198A (zh) 2012-07-04
BR112012005051B1 (pt) 2019-05-21
WO2011028132A1 (en) 2011-03-10

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