WO2023119772A1 - Ensemble électrode - Google Patents

Ensemble électrode Download PDF

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Publication number
WO2023119772A1
WO2023119772A1 PCT/JP2022/035647 JP2022035647W WO2023119772A1 WO 2023119772 A1 WO2023119772 A1 WO 2023119772A1 JP 2022035647 W JP2022035647 W JP 2022035647W WO 2023119772 A1 WO2023119772 A1 WO 2023119772A1
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WO
WIPO (PCT)
Prior art keywords
cathode
block
collector bar
assembly
hole
Prior art date
Application number
PCT/JP2022/035647
Other languages
English (en)
Japanese (ja)
Inventor
涼 秋田
泰弘 小山
拓也 津田
Original Assignee
Ｓｅｃカーボン株式会社
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 Ｓｅｃカーボン株式会社 filed Critical Ｓｅｃカーボン株式会社
Publication of WO2023119772A1 publication Critical patent/WO2023119772A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • 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
    • C25C3/12—Anodes
    • 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
    • C25C3/16—Electric current supply devices, e.g. bus bars
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C25C7/02—Electrodes; Connections thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat

Definitions

  • the present invention relates to electrode assemblies.
  • Electrode blocks (cathode block and anode block) made of carbon are used for the electrodes (cathode and anode) of the electrolytic furnace for aluminum smelting.
  • Electrons are supplied to the electrode block via a metal conductive bar (the one connected to the cathode block is called a “collector bar” and the one connected to the anode block is called a “stub”).
  • a metal conductive bar the one connected to the cathode block
  • the collector bar is connected to the cathode block
  • the stub is connected to the anode block
  • An assembly in which a conductive rod is connected to an electrode block is called an "electrode assembly” without distinguishing between a cathode and an anode.
  • connection between the electrode block and the conductive rod is made by casting iron. Specifically, a groove or hole is formed in the electrode block, a conductive rod is fitted therein, and molten iron heated to about 1250° C. is poured into the gap.
  • US Pat. No. 3,390,071 describes an electrolytic reduction cell for aluminum production.
  • the electrolytic reduction cell includes a graphite cathode block and an oxygen-free copper collector pin electrically connected to the cathode block.
  • a socket is formed in the cathode block for receiving the collector pin.
  • Swiss Patent No. 663624 describes a cathode element comprising a cathode block having a groove formed along its length and a cathode bar made of iron inserted into the groove so as to fit at room temperature. It is The grooves of the cathode block are regularly provided with fine projections over the entire surface so as to support or fix the cathode bar.
  • the method of casting iron described above has a large workload, and energy costs are required for heating to melt the iron and preheating the electrode block and conductive rod.
  • the preheating temperature is too high, the electrode block will oxidize, so the preheating temperature can only be raised to 400 to 500°C, and there is a risk that the electrode block will crack due to heat shock when molten iron is poured.
  • An object of the present invention is to provide an electrode assembly capable of simplifying the connection work between the electrode block and the conductive rod.
  • An electrode assembly according to one embodiment of the present invention is an electrode assembly used in an electrolytic furnace for aluminum smelting, comprising a carbon electrode block having a cylindrical hole and a cylindrical a metal conductive rod, the conductive rod having at least a tip end thereof a blade portion having a shape obtained by cutting a part of the conductive rod into a groove.
  • connection work between the electrode block and the conductive rod can be simplified.
  • FIG. 1 is a cross-sectional view schematically showing the overall configuration of an example of an electrolytic furnace for aluminum smelting.
  • FIG. 2 is a perspective view schematically showing the configuration of the cathode assembly (electrode assembly) according to the first embodiment of the invention.
  • 3 is a cross-sectional view taken along line III-III of FIG. 2.
  • FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 2.
  • FIG. 5 is a side view near the tip of a collector bar of the cathode assembly of FIG. 2;
  • FIG. 6 is a front view of the collector bar of FIG. 5 viewed from the tip side.
  • FIG. 7 is a schematic diagram for explaining the manufacturing method of the cathode assembly.
  • FIG. 1 is a cross-sectional view schematically showing the overall configuration of an example of an electrolytic furnace for aluminum smelting.
  • FIG. 2 is a perspective view schematically showing the configuration of the cathode assembly (electrode assembly
  • FIG. 8 is a schematic diagram for explaining the manufacturing method of the cathode assembly.
  • FIG. 9 is a schematic diagram for explaining the manufacturing method of the cathode assembly.
  • FIG. 10 is a cross-sectional view schematically showing the construction of a cathode assembly (electrode assembly) according to a second embodiment of the invention.
  • FIG. 11 is a cross-sectional view schematically showing the construction of a cathode assembly (electrode assembly) according to a third embodiment of the invention.
  • FIG. 12 is a cross-sectional view schematically showing the construction of a cathode assembly (electrode assembly) according to a fourth embodiment of the invention.
  • FIG. 10 is a cross-sectional view schematically showing the construction of a cathode assembly (electrode assembly) according to a second embodiment of the invention.
  • FIG. 11 is a cross-sectional view schematically showing the construction of a cathode assembly (electrode assembly) according to a third
  • FIG. 13 is a cross-sectional view schematically showing the construction of a cathode assembly (electrode assembly) according to a fifth embodiment of the invention.
  • 14 is a side view near the tip of the collector bar of the cathode assembly of FIG. 13;
  • FIG. 15 is a front view of the collector bar of FIG. 14 viewed from the tip side.
  • FIG. FIG. 16 is a perspective view schematically showing the configuration of an anode assembly (electrode assembly) according to a sixth embodiment of the invention.
  • 17 is a side view near the tip of the stub of the anode assembly of FIG. 16;
  • FIG. 18 is a schematic diagram for explaining the manufacturing method of the anode assembly.
  • FIG. 19 is a schematic diagram for explaining the manufacturing method of the anode assembly.
  • FIG. 20 is a schematic diagram for explaining the manufacturing method of the anode assembly.
  • FIG. 21 is a perspective view schematically showing the configuration of an anode assembly (electrode assembly) according to a seventh embodiment of the invention.
  • FIG. 22 is an exploded perspective view schematically showing the configuration of the anode assembly (electrode assembly) of FIG. 21 during manufacture.
  • FIG. 1 is a cross-sectional view schematically showing the overall configuration of an electrolytic furnace 1, which is an example of an electrolytic furnace for aluminum smelting.
  • the electrolytic furnace 1 comprises a cathode assembly 10, which is an electrode assembly according to the first embodiment of the invention.
  • a plurality of cathode assemblies 10 are arranged side by side in the depth direction (y direction) of FIG.
  • Each cathode assembly 10 comprises a carbon cathode block (electrode block) 11 and two metal collector bars (conducting bars) 12 each connected to the cathode block 11 .
  • the cathode block 11 constitutes the furnace bottom of the electrolytic furnace 1 .
  • One end of each of the two collector bars 12 is pulled out of the electrolytic furnace 1 .
  • the electrolytic furnace 1 includes, in addition to the cathode assembly 10, an anode assembly 91, a shell 92, a lining 93 and the like. Inside the electrolytic furnace 1, a melt 94 containing aluminum oxide is accommodated.
  • the collector bar 12 and anode assembly 91 are electrically connected to a power supply (not shown).
  • a power supply applies a voltage between the cathode block 11 and the anode block of the anode assembly 91 .
  • the aluminum oxide in the melt 94 is reduced to produce aluminum 95 .
  • FIG. 2 is a perspective view schematically showing the configuration of the cathode assembly 10. As shown in FIG. 3 is a cross-sectional view along line III-III of FIG. 2, and FIG. 4 is a cross-sectional view along line IV-IV of FIG.
  • the cathode assembly 10 includes a cathode block 11 and two collector bars 12, as described above.
  • Cathode block 11 is made of carbon, preferably graphite.
  • the collector bar 12 is made of metal, preferably iron.
  • the cathode block 11 has a rectangular parallelepiped shape and has a cylindrical hole 11a on each of a pair of opposing side surfaces.
  • Each collector bar 12 has a cylindrical shape and is inserted into a hole 11 a of the cathode block 11 .
  • a male thread 121 (FIG. 4) is formed on the outer peripheral surface of each collector bar 12 . More specifically, the male thread 121 is formed from the tip of the collector bar 12 to the vicinity of the portion located inside the hole 11a of the cathode block 11 in the axial direction of the collector bar 12 (x direction in FIG. 4). It is The inner peripheral surface of each hole 11 a of the cathode block 11 is formed with a female thread to be fastened with the male thread 121 of the collector bar 12 . Cathode block 11 and collector bar 12 are connected by fastening female threads of cathode block 11 and male threads 121 of collector bar 12 . Thereby, the outer peripheral surface of the collector bar 12 and the inner peripheral surface of the hole 11a are in contact with each other.
  • a female thread formed on the inner peripheral surface of the hole 11a of the cathode block 11 is machined by the collector bar 12, as will be described later.
  • the cathode block 11 has an opening 11b that is continuous with the hole 11a and that opens to the bottom surface of the cathode block 11 .
  • a slit 121b (Fig. 4) is formed in each screw thread of the male screw 121 of the collector bar 12. More specifically, the slits 121b are formed in the threads of the male thread 121 excluding some threads near the tip of the collector bar 12 .
  • FIG. 5 is a side view of the vicinity of the tip of the collector bar 12.
  • FIG. FIG. 6 is a front view of the collector bar 12 viewed from the tip side.
  • the collector bar 12 has a shape called a grooved tapping screw or a thread cutting screw.
  • the collector bar 12 has, at least at its tip, a blade portion 12a having a shape obtained by cutting a portion of the collector bar 12 into a groove.
  • the blade portion 12a has, for example, a shape in which a quarter region of the collector bar 12 in the circumferential direction is cut into a groove shape, as shown in FIG.
  • the width of the groove forming the blade portion 12a may be smaller or larger than this.
  • the collector bar 12 may have a plurality of blade portions 12a.
  • the grooves forming the blade portion 12a need not be parallel to the axial direction of the collector bar 12 (the x direction in FIG. 5), and may be spiral, for example. It is preferable that the grooves forming the blade portion 12 a cross the thread grooves of the male threads 121 of the collector bar 12 .
  • the blade portion 12 a may be formed not only at the tip of the collector bar 12 but also over the entire length of the collector bar 12 .
  • the collector bar 12 also preferably has a tapered shape in which the outer diameter decreases toward the tip.
  • the taper angle ⁇ (FIG. 5) is, but not limited to, 0 to 60°, for example.
  • the lower limit of the taper angle ⁇ is preferably 1°, more preferably 3°.
  • the upper limit of the taper angle ⁇ is preferably 45°, more preferably 40°.
  • the cathode block 11 is formed with a prepared hole 11c having an outer diameter slightly smaller than the outer diameter of the collector bar 12, and an opening 11b.
  • a female thread may not be formed on the inner peripheral surface of the pilot hole 11c.
  • the collector bar 12 is screwed into the pilot hole 11c.
  • the pilot hole 11c of the cathode block 11 is machined by the collector bar 12, the diameter thereof is expanded, and a female thread is formed on the inner peripheral surface.
  • the cathode block 11 is formed with a hole 11a having an internal thread on its inner peripheral surface, and the collector bar 12 is connected to the cathode block 11.
  • the other collector bar 12 is also connected to the cathode block 11 in the same manner. This produces a cathode assembly 10 (FIG. 2) with two collector bars 12 connected to the cathode block 11 .
  • the cathode block 11 and each of the collector bars 12 are connected by fastening the female threads of the cathode block 11 and the male threads 121 of the collector bars 12 .
  • the connection work between the cathode block and the collector bar can be simplified compared to the case of pouring molten iron. Also, energy costs for heating for melting iron and preheating the cathode block and collector bar can be reduced. Furthermore, since there is no risk of cracking due to heat shock, manufacturing costs can be reduced.
  • Each of the cathode block 11 and the collector bar 12 is in contact with the female threaded portion of the cathode block 11 and the male threaded portion 121 of the collector bar 12 . Since this increases the contact area, the contact resistance can be reduced, and CVD (Cathode Voltage Drop) can be reduced.
  • the gap between the female thread of the cathode block 11 and the male thread 121 of the collector bar 12 will vary due to variations in processing.
  • contact resistance may vary, particularly in a low temperature range (for example, a temperature range from room temperature to about 500° C.).
  • Multiple cathode assemblies 10 may be used in the electrolysis furnace 1 (FIG. 1).
  • the temperature of the electrolytic furnace 1 is generally raised from room temperature to near the operating temperature (eg, about 960° C.) by electrical resistance heating (resistor-bake).
  • the current may concentrate in the cathode assembly 10 with low contact resistance during temperature rise, resulting in a local temperature rise. Even during operation, current concentration on the cathode assembly 10 with low contact resistance causes local wear on the cathode electrolysis surface, and uneven heat balance causes problems such as destabilization of operation.
  • the internal threads formed on the inner peripheral surface of the hole 11a of the cathode block 11 are machined by the collector bar 12 .
  • the variation in the gap between the female thread of the cathode block 11 and the male thread 121 of the collector bar 12 is reduced compared to the case where the female thread of the cathode block 11 and the male thread 121 of the collector bar 12 are machined separately. be able to. This can reduce overall efficiency loss and localized wear and tear.
  • the collector bar 12 has a blade portion 12a. According to this configuration, the blade portion 12a functions as a cutting blade, and the cathode block 11 can be processed with a small torque. Further, when the tip of the collector bar 12 is tapered, the collector bar 12 can be better bited into the pilot hole 11c (FIG. 8), and the cathode block 11 can be processed more efficiently.
  • the cathode block 11 has an opening 11b that is continuous with the hole 11a and that opens to the bottom surface of the cathode block 11 (surface other than the surface in which the hole 11a is formed). According to this configuration, it is possible to efficiently discharge cutting dust generated when the cathode block 11 is processed by the collector bar 12 .
  • the cathode assembly 10 is heated to a high temperature (eg 960°C) during operation. Since the coefficient of thermal expansion of the collector bar 12 made of metal is larger than that of the cathode block 11 made of carbon, the thread of the internal thread of the cathode block 11 may be destroyed by the expansion of the collector bar 12 .
  • each of the threads of the external threads 121 of the collector bar 12 is formed with a slit 121b (FIG. 4). When the temperature is high, the stress is relieved by closing the slit 121b. As a result, it is possible to prevent the thread of the internal thread of the cathode block 11 from breaking due to thermal expansion.
  • cathode assembly 10 An example of the cathode assembly 10 and the manufacturing method thereof according to the first embodiment of the present invention has been described above. According to this embodiment, it is possible to simplify the connection work between the cathode block (electrode block) and the collector bar (conductive bar).
  • the cathode assembly 10 has two collector bars 12 . That is, the case where two collector bars 12 are connected to one cathode block 11 has been described. However, the number of collector bars 12 connected to the cathode block 11 may be one, or three or more. Also, in the above embodiment, the case where the collector bars 12 are inserted from both sides of the cathode block 11 has been described, but the collector bars 12 may be arranged so as to pass through the cathode block 11 .
  • FIG. 10 is a cross-sectional view schematically showing the construction of a cathode assembly 20, which is an electrode assembly according to a second embodiment of the invention.
  • Cathode assembly 20 includes a collector bar 22 in place of collector bar 12 of cathode assembly 10 (FIG. 4).
  • the collector bar 22 further includes a conductive member 221 inserted into the core of the collector bar 22 and made of a metal having higher conductivity than the main body of the collector bar 22 .
  • Conductive member 221 is, for example, a bar made of copper.
  • the electrical resistance of the entire collector bar 22 can be lowered. This makes it possible to reduce CVD.
  • the conductive member 221 is arranged only in the center side portion of the cathode block 11 in the axial direction of the collector bar 22 (x direction in FIG. 10). According to this configuration, in the axial direction of the collector bar 22, the electrical resistance of the portion where the conductive member 221 is arranged, that is, the portion on the central side of the cathode block 11 is relatively low.
  • the conductive member 221 may be arranged over the entire axial direction of the collector bar 22 .
  • FIG. 11 is a cross-sectional view schematically showing the configuration of a cathode assembly 30, which is an electrode assembly according to a third embodiment of the invention.
  • Cathode assembly 30 includes a collector bar 32 in place of collector bar 12 of cathode assembly 10 (FIG. 4).
  • a male thread 321 is formed in a portion up to halfway on the tip end side in the axial direction, and a male thread 321 is formed in the remaining portion in the axial direction. is not threaded.
  • the rest of the configuration of collector bar 32 is similar to collector bar 12 (FIG. 4).
  • the non-threaded portion of the collector bar 32 has a smaller binding force from the cathode block 11 than the threaded portion. Therefore, the unthreaded portion of the collector bar 32 can expand more freely in the axial direction (x direction in FIG. 11) than the threaded portion. Therefore, stress is relieved more than when threads are formed on the entire outer peripheral surface. As a result, it is possible to prevent the thread of the internal thread of the cathode block 11 from breaking due to thermal expansion.
  • the non-threaded portion of the collector bar 32 has a smaller contact area with the cathode block 11 than the threaded portion. Therefore, in the axial direction of the collector bar 32, the electrical resistance of the end portion of the cathode block 11 is relatively high.
  • FIG. 12 is a cross-sectional view schematically showing the construction of a cathode assembly 40, which is an electrode assembly according to a fourth embodiment of the invention.
  • Cathode assembly 40 includes a collector bar 42 in place of collector bar 12 of cathode assembly 10 (FIG. 4).
  • the collector bar 42 further has a hole 42a formed in a direction intersecting with the axial direction of the collector bar 42 (x direction in Fig. 12).
  • FIG. 12 illustrates a case where five holes 42a are formed, the number of holes 42a is arbitrary. The number of holes 42a may be one. Hole 42a may or may not pass through collector bar 42 .
  • the stress is relieved by contraction of the holes 42a at high temperatures.
  • it is possible to prevent the thread of the internal thread of the cathode block 11 from breaking due to thermal expansion.
  • the holes 42a are arranged only at the ends of the cathode block 11 in the axial direction of the collector bar 42 . According to this configuration, in the axial direction of the collector bar 42, the electrical resistance of the portion where the hole 42a is arranged, that is, the portion on the end side of the cathode block 11 becomes relatively high.
  • the holes 42a may be arranged throughout the collector bar 42 in the axial direction.
  • FIG. 13 is a cross-sectional view schematically showing the construction of a cathode assembly 50, which is an electrode assembly according to a fifth embodiment of the invention.
  • Cathode assembly 50 comprises cathode block 51 and collector bar 52 .
  • the cathode block 51 has a cylindrical hole 51a for connecting the collector bar 52, like the cathode block 11 (FIG. 4). Unlike the hole 11a of the cathode block 11, the hole 51a is not threaded on the inner peripheral surface. Similarly to the cathode block 11, the cathode block 51 also has an opening 51b that is continuous with the hole 51a and opens to the bottom surface of the cathode block 51. As shown in FIG.
  • the collector bar 52 has a columnar shape like the collector bar 12 (Fig. 4), but does not have threads formed on its outer peripheral surface.
  • Cathode block 11 and collector bar 52 are connected by inserting collector bar 52 into hole 51 a of cathode block 51 . More specifically, the collector bar 52 is inserted so that the outer peripheral surface of the collector bar 52 is in contact with the inner peripheral surface of the hole 51a. It is preferable that the outer diameter of the collector bar 52 is as close as possible to the outer diameter of the hole 51a at room temperature without exceeding the outer diameter of the hole 51a. Holes 51a of cathode block 51 are formed by collector bars 52, as will be described later.
  • FIG. 14 is a side view of the vicinity of the tip of the collector bar 52.
  • FIG. FIG. 15 is a front view of the collector bar 52 viewed from the tip side.
  • the collector bar 52 has, at least at its tip, a blade portion 52a having a shape obtained by cutting a portion of the collector bar 52 into a groove.
  • the collector bar 52 preferably has a tapered shape in which the outer diameter decreases toward the tip.
  • a preferred range for the taper angle ⁇ is the same as for the collector bar 12 .
  • the cathode assembly 50 can be manufactured similarly to the cathode assembly 10. First, the cathode block 51 is formed with a prepared hole having an outer diameter slightly smaller than the outer diameter of the collector bar 52 and an opening 51b. Next, the collector bar 52 is screwed into the pilot hole. At this time, the pilot hole of the cathode block 51 is machined by the collector bar 52 .
  • the blade portion 52a of the collector bar 52 functions as a cutting blade, and the pilot hole of the cathode block 51 can be enlarged.
  • the opening 51b formed in the cathode block 51 can efficiently discharge cutting dust.
  • a hole 51 a is formed in the cathode block 51 and the collector bar 52 is connected to the cathode block 51 .
  • This embodiment also simplifies the connection work between the cathode block (electrode block) and the collector bar (conductive rod).
  • the cathode block electrode block
  • the collector bar conductive rod
  • FIG. 16 is a perspective view schematically showing the configuration of an anode assembly 60, which is an electrode assembly according to the sixth embodiment of the present invention.
  • the anode assembly 60 comprises an anode block (electrode block) 61 and three stubs (conductive bars) 62 .
  • Anode block 61 is made of carbon.
  • the stub 62 is made of metal, preferably iron.
  • Anode assembly 60 further comprises yoke 63 and rod 64 connected with stub 62 .
  • the yoke 63 is made of metal, preferably iron.
  • Rod 64 is made of metal, preferably aluminum.
  • FIG. 16 illustrates the case where the rod 64 is directly connected to one of the stubs 62 , the rod 64 may be connected to the stub 62 via the yoke 63 .
  • the anode block 61 has a substantially rectangular parallelepiped shape and has three cylindrical holes 61a.
  • Each of the stubs 62 has a cylindrical shape and is inserted into a hole 61 a of the anode block 61 .
  • FIG. 17 is a side view of the vicinity of the tip of the stub 62.
  • FIG. A male thread 621 is formed on the outer peripheral surface of each stub 62 . More specifically, the male thread 621 extends from the tip of the stub 62 in the axial direction of the stub 62 (direction z in FIG. 17) to the vicinity of the portion located inside the hole 61a of the anode block 61 (FIG. 16). is formed in A female thread that is fastened to the male thread 621 of the stub 62 is formed on the inner peripheral surface of each of the holes 61 a of the anode block 61 .
  • Each of the anode block 61 and the stub 62 is connected by fastening the female thread of the anode block 61 and the male thread 621 of the stub 62 . Thereby, the outer peripheral surface of the stub 62 and the inner peripheral surface of the hole 61a are in contact with each other.
  • a female thread formed on the inner peripheral surface of the hole 61a of the anode block 61 is machined by a stub 62, as will be described later.
  • a slit 621a is formed in each screw thread of the male screw 621 of the stub 62 . More specifically, the slit 621 a is formed in the male thread 621 except for some threads near the tip of the stub 62 .
  • the stub 62 has, at least at its tip, a blade portion 62a having a shape obtained by cutting a part of the stub 62 into a groove, like the collector bar 12 (FIG. 5) in the first embodiment.
  • the stub 62 also preferably has a tapered shape with an outer diameter that decreases toward the tip.
  • a preferred range for the taper angle ⁇ is the same as for the collector bar 12 .
  • the anode block 61 is formed with a prepared hole 61b having an outer diameter slightly smaller than the outer diameter of the stub 62 .
  • a female thread may not be formed on the inner peripheral surface of the pilot hole 61b.
  • the stub 62 is screwed into the pilot hole 61b.
  • the pilot hole 61b of the anode block 61 is machined by the stub 62 to expand its diameter and form a female thread on its inner peripheral surface.
  • the anode block 61 is formed with a hole 61a having a female thread on its inner peripheral surface, and the stub 62 is connected to the anode block 61.
  • the stub 62 is connected to the anode block 61.
  • other stubs 62 are similarly connected to the anode block 61 .
  • Yoke 63 (FIG. 16) is then connected to stub 62, for example by resistance welding, and rod 64 (FIG. 16) is connected to stub 62 or yoke 63, for example by resistance welding. This produces the anode assembly 60 (FIG. 16).
  • the anode assembly 60 it is possible to simplify the connection work between the anode block (electrode block) and the stub (conductive rod).
  • the hole 61a with the stub 62, the gap between the female thread of the anode block 61 and the male thread 621 of the stub 62 is reduced compared to the case where the female thread of the anode block 61 and the male thread 621 of the stub 62 are processed separately. variation can be reduced.
  • the case where the anode assembly 60 has three stubs 62 has been described. That is, the case where three stubs 62 are connected to one anode block 61 has been described.
  • the number of stubs 62 connected to the anode block 61 may be one, two, or four or more.
  • FIG. 21 is a perspective view schematically showing the configuration of an anode assembly 70, which is an electrode assembly according to a seventh embodiment of the invention.
  • FIG. 22 is an exploded perspective view schematically showing the configuration of the anode assembly 70 during manufacture.
  • the anode assembly 70 includes two anode blocks (electrode blocks) 71 , four stubs (conductive rods) 72 , four yokes 73 and rods 74 .
  • two stubs 72 are connected to each of two anode blocks 71
  • a total of four stubs 72 are connected to rods 74 via yokes 73 .
  • Each of the anode blocks 71 is similar to the anode blocks 61 of the anode assembly 60 (FIG. 16) except that the number of holes 71a is two.
  • Each of the stubs 72 is similar to the stubs 62 (FIG. 17) except that the ratio of the length of the external thread 721 (FIG. 22) to the outer peripheral surface is different.
  • the male thread 721 is formed on substantially the entire outer peripheral surface of the stub 72 .
  • Rod 74 is similar to rod 64 of anode assembly 60 (FIG. 16).
  • the shape of the yoke 73 is significantly different from the yoke 63 of the anode assembly 60 (FIG. 16).
  • a yoke 73 is provided corresponding to each of the four stubs 72.
  • Each yoke 73 includes a socket portion 731 having a through hole 731a (FIG. 22), a socket portion 731 and a rod 74. and a connecting portion 732 for connecting the .
  • a female thread that is fastened to the male thread 721 of the stub 72 is formed on the inner peripheral surface of the through hole 731 a of the socket portion 731 .
  • the stub 72 and the yoke 73 are connected by fastening the male thread 721 and the female thread of the socket portion 731 .
  • Each of the stubs 72 passes through the socket portion 731 and is inserted into the hole 71 a of the anode block 71 .
  • the inner peripheral surface of each of the holes 71 a of the anode block 71 is formed with a female thread to be fastened with the male thread 721 of the stub 72 .
  • Each of the anode block 71 and the stub 72 is connected by fastening the female thread of the anode block 71 and the male thread 721 of the stub 72 . Thereby, the outer peripheral surface of the stub 72 and the inner peripheral surface of the hole 71a are in contact with each other.
  • the female thread formed on the inner peripheral surface of the hole 71a of the anode block 71 is processed by the stub 72.
  • the stub 72 has, at least at its tip, a blade portion 72a having a shape obtained by cutting a part of the stub 72 into a groove, similarly to the stub 62 (FIG. 17).
  • the anode block 71 is formed with a pilot hole 71 b having an outer diameter slightly smaller than the outer diameter of the stub 72 .
  • a female thread may not be formed on the inner peripheral surface of the pilot hole 71b.
  • the stub 72 is screwed into the through hole 731a of the socket portion 731 of the yoke 73. After screwing the stub 72 through the socket portion 731 , the stub 72 is further screwed into the prepared hole 71 b of the anode block 71 . At this time, the pilot hole 71b of the anode block 71 is machined by the stub 72 to expand its diameter and form a female thread on its inner peripheral surface.
  • a hole 71 a ( FIG. 21 ) having a female thread formed on the inner peripheral surface is formed in the anode block 71 and the stub 72 is connected to the anode block 71 .
  • the stub 72 is also connected to the yoke 73 .
  • the yoke 73 and the rod 74 may be connected in advance before the stub 72 is connected, or may be connected after the stub 72 is connected.
  • the yoke 73 and the rod 74 can be connected by resistance welding, for example, but not limited to this. Anode assembly 70 is thereby manufactured.
  • This embodiment also simplifies the connection work between the anode block (electrode block) and the stub (conductive rod).
  • the anode assembly 70 includes two anode blocks 71 and two stubs 72 are connected to each of the two anode blocks 71 has been described.
  • the number of anode blocks 71 may be one, or three or more.
  • the number of stubs 72 connected to each anode block 71 may be one, or three or more.
  • the second to fourth embodiments can be implemented in any combination.
  • the collector bar 52 (FIG. 13) explained in the fifth embodiment may be combined with the conductive member 221 (FIG. 10) explained in the second embodiment, or the hole 42a (FIG. 10) explained in the fourth embodiment may be combined. 12) may be combined, or both of these may be combined.
  • the stub described in the sixth and seventh embodiments may be provided with the conductive member described in the second embodiment.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

L'invention fournit un ensemble électrode qui permet de faciliter une opération de connexion entre un bloc d'électrode et une tige conductrice. Cet ensemble électrode est mis en œuvre dans un four électrolytique pour fusion d'aluminium, et est équipé : d'un bloc d'électrode (11) en carbone présentant un orifice (11a) cylindrique ; et d'une tige conductrice (12) métallique également cylindrique insérée dans l'orifice (11a). La tige conductrice (12) possède, sur au moins son extrémité avant, une partie tranchant (12a) dont la forme est obtenue par découpe en rainure d'une partie de la tige conductrice (12).
PCT/JP2022/035647 2021-12-23 2022-09-26 Ensemble électrode WO2023119772A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-209434 2021-12-23
JP2021209434A JP2023094140A (ja) 2021-12-23 2021-12-23 電極アセンブリ

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WO2023119772A1 true WO2023119772A1 (fr) 2023-06-29

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JP (1) JP2023094140A (fr)
WO (1) WO2023119772A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3390071A (en) * 1964-10-26 1968-06-25 Reynolds Metals Co Cathode construction for aluminum reduction cell
JP2017222914A (ja) * 2016-06-16 2017-12-21 Ｓｅｃカーボン株式会社 カソード
CN108396335A (zh) * 2018-04-09 2018-08-14 东北大学 铝电解用金属陶瓷基惰性阳极与导杆连接结构及制备方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3390071A (en) * 1964-10-26 1968-06-25 Reynolds Metals Co Cathode construction for aluminum reduction cell
JP2017222914A (ja) * 2016-06-16 2017-12-21 Ｓｅｃカーボン株式会社 カソード
CN108396335A (zh) * 2018-04-09 2018-08-14 东北大学 铝电解用金属陶瓷基惰性阳极与导杆连接结构及制备方法

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