# US 2018/0023206 A1 · An anode for use in an electrolysis process for production of aluminium in cells of hall-héroult type, and a method for making same

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- Number: US 2018/0023206 A1
- Document ID: US20180023206A1
- Status: Published application
- Kind: A1
- Application number: 15/548,840
- Filed: 2016-02-09
- Published: 2018-01-25
- Earliest claimed: 2015-02-13
- Assignees: Norsk Hydro ASA
- Applicants: Norsk Hydro Asa
- Inventors: Jørund HOP; Inge Arild VEE; Grzegorz STEFANSKI; Anders LILLEBY; Hans KUEPPERS; Per Johnny TEIGEN; Vidar HJELLE
- Web page: https://patentgrep.com/patent/US20180023206A1

## CPC

- C25C 3/125: {based on carbon}
- C25C 3/10: External supporting frames or structures
- C25C 3/16: Electric current supply devices, e.g. bus bars
- C25C: PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR

## Abstract

An anode for use in an electrolysis process for production of aluminium in cells of Hail-Héroult type, the anode comprises a body or block (120; 20) of calcinated carbonaceous material connected with an electrical current lead, where said current lead being connected with an anode rod (103; 3) and further being part of an anode hanger (101; 1). The current lead comprises at least one metallic suspension plate(s) (104; 4. 4′) with vertically oriented redding plates (105 105′″,5, 5′) at least partly embedded by their lower partly in corresponding recesses (113, 113″″, 13. 13′; 100, 100′) in the top of the carbonaceous block (120; 20} and further connected by mechanical fixation means (108; 8; 14, 16). Said recesses are wider than the rodding plates and being filled with an electric conductive particulate material only. It Is also described a method for processing an undercut recess (10) in the an ode top for mechanically fixing the anode block (20) to a protrusion (8) on the current lead.

## Claims

### Claim 1

An anode for use in an electrolysis process for production of aluminium in cells of Hall-Héroult type, the anode comprises a body or block (120; 20) of calcinated carbonaceous material connected with an electrical current lead, where said current lead being connected with an anode rod (3) and further being part of an anode hanger (101; 1), wherein the current lead is embedded in a recess in top of said carbonaceous block (120; 20), the recess being wider than the lead and being filled with an electric conductive particulate material only, and further that the current lead and the block of calcinated carbonaceous material are connected by mechanical fixation means,
characterised in that
the current lead comprises at least one metallic suspension plate(s) (104; 4, 4′) of a metallic material and having at least two rodding plates (105, 105″″; 5, 5′) at least partly embedded by their lower parts in corresponding recesses (113, 113″″; 13, 13′) in the top of the carbonaceous block (120; 20), where the suspension plate(s) (104; 4, 4′) is electrically connected with the anode rod (103; 3) at its upper part(s).

### Claim 2 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the suspension plate(s) (104; 4, 4′) is connected with the anode rod (103; 3) via one or more connecting members (106, 106′; 6, 6′).

### Claim 3 (depends on 2)

An anode in accordance with claim 2,
characterised in that
at least one of the connecting members (106, 106″; 6, 6′) is a tri-metallic connection and of a triangular shape with one part connecting a vertical surface of the anode rod (103; 3) and one other part connecting an upper part of the suspension plate(s) (104; 4, 4′).

### Claim 4 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the suspension plate(s) (104; 4, 4′) is made of a composite or clad material, where at least the upper part(s) of the yoke plate(s) have relatively better electrical conductivity than the lower part(s).

### Claim 5 (depends on 1)

An anode in accordance with claim 1,
characterised in that
there is one horizontally oriented suspension plate (104) having two or more vertically oriented rodding plates (105, 105″″) at its lower surface.

### Claim 6 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the suspension plate (104) is connected to the anode rod (103) via one spacer (144).

### Claim 7 (depends on 1)

An anode in accordance with claim 1,
characterised in that
there are at least two vertically oriented suspension plates (4, 4′) that are connected with rodding plates (5, 5′) at their lower ends respectively.

### Claim 8 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the electric conductive particulate material comprises particles that have a spherical form.

### Claim 9 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the electric conductive particulate material comprises particles that have an oval or elliptic form.

### Claim 10 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the electric conductive particulate material comprises magnetic particles.

### Claim 11 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the electric conductive particulate material comprises particles made out of iron or an iron alloy.

### Claim 12 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the electric conductive particulate material comprises particles that are made out of steel or a steel alloy.

### Claim 13 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the anode block is secured to the current lead by means of a spike, bolt or the like interconnecting the rodding plates (105, 105″″; 5, 5′) with the anode block (120; 20).

### Claim 14 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the anode block is secured to the current lead by protruding fixation means (108, 108′, 108″, 108′″; 8, 8′, 8″, 8′″ on the rodding plates 105′, 105″″; 5, 5′) and undercut recesses (110, 100′, 110″, 110′″; 10, 10′, 10″, 10′″) arranged in the anode (120; 20).

### Claim 15 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the material in the upper part of the suspension plate(s) (104; 4, 4′) comprises copper (Cu).

### Claim 16 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the metallic material of the suspension plate(s) (104; 4, 4′) is steel.

### Claim 17 (depends on 1)

An anode in accordance with claim 1,
characterised in that
the metallic material of the rodding plate(s) (105; 5, 5′) is steel.

### Claim 18

A method for making an anode for use in an electrolysis process for production of aluminium in cells of Hall-Héroult type, the anode comprises a body or block (20) of calcinated carbonaceous material connected with a plate-shaped electrical current lead, where said current lead being electrically connected with an anode rod (3) at one end and further being embedded in a recess (13) in top of said carbonaceous block (20) at the other end, the recess being wider than the lead and being filled with an electric conductive particulate material only, where the anode block is mechanically secured to the current lead by protruding fixation means (8″) arranged on the current lead and further corresponding with an undercut recess (10″) arranged in the anode block,
characterised in that
the recess (13) is made by processing an elongated slot or groove in the top of the anode block (20), then a bore (11) is made at an appropriate place of the recess (13) by applying a rotating processing tool, the bore being wider than the recess (13) and thereby defining a point of entrance of the protruding fixation means (8), followed by processing an undercut recess (10) with flanges (12, 12′) in the recess (13) by moving a processing tool along said recess (13) inside the anode block (20).

### Claim 19 (depends on 18)

A method according to claim 18,
characterised in that
the rotating processing tool is arranged for processing the bore (11) and the undercut recess (10) in the calcinated carbon material by first axial processing followed by radial processing.