EP2102387A1 - Method for the heating of anode blocks, and an arrangement for the heating of anode blocks. - Google Patents

Method for the heating of anode blocks, and an arrangement for the heating of anode blocks.

Info

Publication number
EP2102387A1
EP2102387A1 EP07852176A EP07852176A EP2102387A1 EP 2102387 A1 EP2102387 A1 EP 2102387A1 EP 07852176 A EP07852176 A EP 07852176A EP 07852176 A EP07852176 A EP 07852176A EP 2102387 A1 EP2102387 A1 EP 2102387A1
Authority
EP
European Patent Office
Prior art keywords
caused
elements
anode
cup
blocks
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
EP07852176A
Other languages
German (de)
French (fr)
Other versions
EP2102387B1 (en
EP2102387A4 (en
Inventor
Örjan DANIELSSON
Stefan Springmann
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.)
Sandvik Intellectual Property AB
Original Assignee
Sandvik Intellectual Property AB
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 Sandvik Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Publication of EP2102387A1 publication Critical patent/EP2102387A1/en
Publication of EP2102387A4 publication Critical patent/EP2102387A4/en
Application granted granted Critical
Publication of EP2102387B1 publication Critical patent/EP2102387B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • C25C3/12—Anodes
    • C25C3/125—Anodes based on carbon
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/62—Heating elements specially adapted for furnaces
    • H05B3/64—Heating elements specially adapted for furnaces using ribbon, rod, or wire heater

Definitions

  • the present invention relates to a method for the heating of anode blocks, and to an arrangement for the heating of anode blocks .
  • anode blocks consist of granulated graphite. Holes are present in these blocks in order to attach electrical contacts of iron, known as “yokes", by moulding.
  • the sizes of the blocks may vary, and the number of contact holes into which contacts are to be attached may also vary. There is normally between three and six holes.
  • the blocks may have different dimensions: the dimensions may, for example, be 1300 x 500 x 500 millimetre.
  • the anode blocks are exchanged at regular intervals.
  • the anode blocks are then renovated and stored until they are to be reused.
  • Water can collect in the holes in the blocks as a result of precipitation, since the blocks are often stored outdoors, to a certain extent.
  • the blocks furthermore, are also exposed to moist air. Water is sucked into the blocks, or is absorbed into the blocks, since the material of the blocks is porous.
  • the present invention thus relates to a method for heating anode blocks, which anode blocks are used in the production of aluminium and comprise contact holes into which it is arranged that electrical contacts are to be attached, and it is characterised in that the holes are caused to be heated by means of radiative heat from electrical resistive elements arranged to be used at high temperatures, in that the wire of the elements is in the form of shanks with two or more legs, in that each one of the elements is caused to be arranged in a cup with an open end surface, and in that one cup for each hole in the anode block is caused to lie in front of the hole in question.
  • the invention relates to an arrangement of the type and with the principal characteristics specified by patent claim 6.
  • Figure 1 shows an arrangement according to the invention seen from the side with an anode block that lies beneath it
  • Figures 2 and 3 show different perspective sketches of the arrangement according to the invention and an anode block.
  • Figure 1 shows an arrangement 1 for the heating of anode blocks 2, which anode blocks are used during the production of aluminium and which comprise contact holes 3 into which it is arranged that electrical contacts are to be attached.
  • the arrangement 1 comprises electrical resistive elements 4, 5, 6, shown in Figure 3, arranged to be used at high temperatures. It is preferred to use resistive elements that are manufactured by KANTHAL AB, Sweden, and that are marketed under the name "Kanthal Super". This element can be heated in operation up to 1900 °C.
  • the wires of the elements 4-6 are formed as shanks with two or more legs. Each one of the elements 4-6 is arranged in a cylindrical cup 7, 8, 9 with an open end surface. It is preferable that the cup is cylindrical.
  • the cups 7-9 with the resistive elements 4-6 are equal in number to the number of holes 3 in the anode block 2. The cups 7-9 are placed into a holder 10 that is common for all cups such that one cup 7-9 for each hole 3 in the anode block 2 is caused to lie in front of the hole 3 in question.
  • the use by this arrangement of radiative heat from high- temperature elements entails a method of heating of much greater efficiency than the previous art technology that has been described, since no water is added at the beginning of the heating process.
  • a much higher power can be achieved over a limited surface through the use of high-temperature elements, and this also contributes to a more rapid heating and drying of the anode blocks.
  • the said elements are caused to be a high-temperature element.
  • the said cup is caused to be of a fibre insulation material comprising AI2O3
  • each resistive element is caused to develop a power of approximately 10-20 kW.
  • the distance between the said open end surface and the anode block is caused to exceed a couple of millimetres and to lie below a couple of centimetres.
  • This method has been shown to be able to reduce significantly the drying time for anode blocks from that required by the prior art technology.
  • the drying time is as short as approximately 4 minutes with the dimensions of the anode block given above as examples.
  • the present invention thus solves the problem described in the introduction.
  • the present invention is not by any means limited to a method or an arrangement to be used with anode blocks having three holes.
  • the invention can be used for all designs of anode block with holes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Resistance Heating (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Primary Cells (AREA)

Abstract

A method for the heating of anode blocks, which anode blocks (2) are used during the production of aluminium and comprise contact holes (3) into which it is arranged that electrical contacts are to be attached. The invention is characterised in that the holes (3) are caused to be heated by means of radiative heat from electri- cal resistive elements (4, 5, 6) arranged to be used at high temperatures, in that the wire of the elements (4, 5, 6) is in the form of shanks with two or more legs, in that each one of the elements (4, 5, 6) is caused to be arranged in a cup (7, 8, 9) with an open end surface, in that one cup (7, 8, 9) for each hole (3) in the anode block (2) is caused to lie in front of the hole(3) in question. The invention relates also to an arrangement.

Description

Method for the heating of anode blocks, and an arrangement for the heating of anode blocks.
The present invention relates to a method for the heating of anode blocks, and to an arrangement for the heating of anode blocks .
During the production process for primary aluminium, objects known as "anode blocks" are used. The blocks consist of granulated graphite. Holes are present in these blocks in order to attach electrical contacts of iron, known as "yokes", by moulding. The sizes of the blocks may vary, and the number of contact holes into which contacts are to be attached may also vary. There is normally between three and six holes. The blocks may have different dimensions: the dimensions may, for example, be 1300 x 500 x 500 millimetre.
The anode blocks are exchanged at regular intervals. The anode blocks are then renovated and stored until they are to be reused.
Water can collect in the holes in the blocks as a result of precipitation, since the blocks are often stored outdoors, to a certain extent. The blocks, furthermore, are also exposed to moist air. Water is sucked into the blocks, or is absorbed into the blocks, since the material of the blocks is porous.
Water must be removed and the blocks must be dried before a secure attachment of contacts by moulding can be carried out. This is currently carried out through first the removal of liquid water by blowing with pressurised air, and then the heating of the block with the aid of gas burners in order to dry it. The problem with this procedure is that the gas in the burners contains a certain amount of water vapour that initially condenses onto the block before the temperature of the block has been sufficiently raised. A result of this is that it takes far too long to dry the blocks.
It is one requirement that the drying time be considerably reduced. The present invention solves this problem.
The present invention thus relates to a method for heating anode blocks, which anode blocks are used in the production of aluminium and comprise contact holes into which it is arranged that electrical contacts are to be attached, and it is characterised in that the holes are caused to be heated by means of radiative heat from electrical resistive elements arranged to be used at high temperatures, in that the wire of the elements is in the form of shanks with two or more legs, in that each one of the elements is caused to be arranged in a cup with an open end surface, and in that one cup for each hole in the anode block is caused to lie in front of the hole in question.
Furthermore, the invention relates to an arrangement of the type and with the principal characteristics specified by patent claim 6.
The invention will be described in more detail below, partially with reference to an embodiment of the invention shown in the attached drawings, where:
- Figure 1 shows an arrangement according to the invention seen from the side with an anode block that lies beneath it, Figures 2 and 3 show different perspective sketches of the arrangement according to the invention and an anode block.
Figure 1 shows an arrangement 1 for the heating of anode blocks 2, which anode blocks are used during the production of aluminium and which comprise contact holes 3 into which it is arranged that electrical contacts are to be attached.
According to the invention, the arrangement 1 comprises electrical resistive elements 4, 5, 6, shown in Figure 3, arranged to be used at high temperatures. It is preferred to use resistive elements that are manufactured by KANTHAL AB, Sweden, and that are marketed under the name "Kanthal Super". This element can be heated in operation up to 1900 °C. The wires of the elements 4-6 are formed as shanks with two or more legs. Each one of the elements 4-6 is arranged in a cylindrical cup 7, 8, 9 with an open end surface. It is preferable that the cup is cylindrical. The cups 7-9 with the resistive elements 4-6 are equal in number to the number of holes 3 in the anode block 2. The cups 7-9 are placed into a holder 10 that is common for all cups such that one cup 7-9 for each hole 3 in the anode block 2 is caused to lie in front of the hole 3 in question.
The use by this arrangement of radiative heat from high- temperature elements entails a method of heating of much greater efficiency than the previous art technology that has been described, since no water is added at the beginning of the heating process. A much higher power can be achieved over a limited surface through the use of high-temperature elements, and this also contributes to a more rapid heating and drying of the anode blocks. According to one preferred embodiment of the invention, the said elements are caused to be a high-temperature element.
According to another preferred embodiment, the said cup is caused to be of a fibre insulation material comprising AI2O3
According to a further preferred embodiment, each resistive element is caused to develop a power of approximately 10-20 kW.
According to another further preferred embodiment, the distance between the said open end surface and the anode block is caused to exceed a couple of millimetres and to lie below a couple of centimetres.
This method has been shown to be able to reduce significantly the drying time for anode blocks from that required by the prior art technology. The drying time is as short as approximately 4 minutes with the dimensions of the anode block given above as examples.
The present invention thus solves the problem described in the introduction.
It has, in addition, proved to be the case when testing the arrangement that the drying time can be further reduced by blowing air, in association with the heating process, through the cups down into the holes of the anode block using a suitable and previously known blowing arrangement. The present invention is not by any means limited to a method or an arrangement to be used with anode blocks having three holes. The invention can be used for all designs of anode block with holes.
Several embodiments have been described above. However, the invention can be varied in ways that will be obvious for one skilled in the art, and thus the invention is not to be seen as limited to the embodiments described above, since it can be varied within the scope of the attached patent claims.

Claims

Claims
1. A method for heating anode blocks, which anode blocks (2) are used in the production of aluminium and comprise contact holes (3) into which it is arranged that electrical contacts are to be attached, characterised in that the holes (3) are caused to be heated by means of radiative heat from electrical resistive elements (4, 5, 6) arranged to be used at high temperatures, in that the wire of the elements (4, 5, 6) is in the form of shanks with two or more legs, in that each one of the elements (4, 5, 6) is caused to be arranged in a cup (7, 8, 9) with an open end surface, in that one cup (7, 8, 9) for each hole (3) in the anode block (2) is caused to lie in front of the hole in question (3) .
2. A method according to claim 1, characteri sed in that the said elements (4, 5, 6) are caused to be a high- temperature element.
3. A method according to claim 1 or 2, characteri sed i n that the said cup (7, 8, 9) is caused to be of a fibre insulating material comprising AI2O3 and/or SiU2.
4. A method according to claim 1, 2 or 3, character- i s e d in that each resistive element (4, 5, 6) is caused to develop a power of approximately 10-20 kW.
5. A method according to any one of the preceding claims, characteri sed in that the distance between the said open end surface and the anode block (2) is caused to exceed a couple of millimetres and to lie below a couple of centime¬ tres .
6. An arrangement for the heating of anode blocks, which anode blocks (2) are used in the production of aluminium and comprise contact holes (3) into which it is arranged that electrical contacts are to be attached, characterised in that the arrangement comprises electrical resistive elements (4, 5, 6) arranged to be used at high temperatures, in that the wire of the elements (4, 5, 6) is in the form of shanks with two or more legs, in that each one of the elements (4, 5, 6) is arranged in a cup (7, 8, 9) with an open end surface, in that the cups (7, 8, 9) with the resistive elements (4, 5, 6) are equal in number to the number of holes (3) in the anode block (2), and in that the cups (3) are placed into a holder (10) that is common for all the cups such that one cup (7, 8, 9) for each hole (3) in the anode block (2) is caused to lie in front of the hole in question (3) .
7. An arrangement according to claim 6, characterised i n that the said element (4, 5, 6) is a high-temperature element.
8. An arrangement according to claim 6 or 7, characterised in that the said cup (7, 8, 9) is manufactured from a fibre insulating material comprising AI2O3 and/or Siθ2.
9. An arrangement according to claim 6, 7 or 8, characterised in that each resistive element (4, 5, 6) is arranged to develop a power of approximately 10-20 kW.
10. An arrangement according to any one of claims 6-9, characterised in that the distance between the said open end surface and the anode block (2) is caused to exceed a couple of millimetres and to lie below a couple of centimetres .
EP07852176.2A 2006-12-15 2007-11-27 Method for the heating of anode blocks, and an arrangement for the heating of anode blocks. Active EP2102387B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0602707A SE531376C2 (en) 2006-12-15 2006-12-15 Method of heating anode blocks, as well as apparatus for heating anode blocks
PCT/SE2007/050904 WO2008073031A1 (en) 2006-12-15 2007-11-27 Method for the heating of anode blocks, and an arrangement for the heating of anode blocks.

Publications (3)

Publication Number Publication Date
EP2102387A1 true EP2102387A1 (en) 2009-09-23
EP2102387A4 EP2102387A4 (en) 2010-09-29
EP2102387B1 EP2102387B1 (en) 2016-01-27

Family

ID=39511959

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07852176.2A Active EP2102387B1 (en) 2006-12-15 2007-11-27 Method for the heating of anode blocks, and an arrangement for the heating of anode blocks.

Country Status (6)

Country Link
EP (1) EP2102387B1 (en)
CN (1) CN101573475B (en)
AU (1) AU2007332181B2 (en)
CA (1) CA2672507C (en)
SE (1) SE531376C2 (en)
WO (1) WO2008073031A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO333400B1 (en) * 2009-08-25 2013-05-27 Norsk Hydro As Process and plant for cleaning and drying of calcined electrodes
CN103103567B (en) * 2012-09-28 2015-09-23 河南永登铝业有限公司阳城分公司 Electrolytic aluminum equipment and anode block process furnace thereof
CN110541175B (en) * 2019-10-17 2021-07-06 台州衡力金属制品有限公司 Heating device for electrolytic aluminum anode production

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE395214B (en) * 1975-09-09 1977-08-01 Bulten Kanthal Ab DEVICE FOR ELECTRICALLY HEATED RESISTANT STOVES
DE2844222C2 (en) * 1978-10-11 1984-10-18 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Method and device for connecting anodes to their anode rods
US4394566A (en) * 1979-11-27 1983-07-19 Bulten-Kanthal Aktiebolag Ladle preheater
EP0150680A3 (en) * 1984-01-18 1985-08-28 Schweizerische Aluminium AG Process for attaching anode blocks to an anode hanging
AU7625594A (en) * 1993-08-27 1995-03-21 Asbjorn Moen Procedure and device for electrical drying and preheating of cells for electrolysis
SE518582C2 (en) * 2000-02-18 2002-10-29 Kanthal Ab Heating furnace in which heat is transmitted by radiation
JP2004139769A (en) * 2002-10-16 2004-05-13 Aruba Japan:Kk Exoergic structure
CN2653407Y (en) * 2003-10-16 2004-11-03 韦力 Electric induction heating drier

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200434 Thomson Scientific, London, GB; AN 2004-362214 XP002589959 -& JP 2004 139769 A (ARUBA JAPAN KK) 13 May 2004 (2004-05-13) *
See also references of WO2008073031A1 *

Also Published As

Publication number Publication date
SE531376C2 (en) 2009-03-17
CN101573475A (en) 2009-11-04
CA2672507A1 (en) 2008-06-19
SE0602707L (en) 2008-06-16
CN101573475B (en) 2011-08-17
AU2007332181B2 (en) 2010-05-20
CA2672507C (en) 2015-02-24
EP2102387B1 (en) 2016-01-27
AU2007332181A1 (en) 2008-06-19
EP2102387A4 (en) 2010-09-29
WO2008073031A1 (en) 2008-06-19

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