US 12,331,418 B2
Method for lining a cathode assembly of an electrolysis cell for producing aluminum
Aleksandr Vladimirovich Proshkin, Krasnoyarsk (RU); Andrej Gennad'evich Sbitnev, Krasnoyarsk (RU); Aleksej Sergeevich Zherdev, Krasnoyarsk (RU); Vitalij Valer'evich Pingin, Krasnoyarsk (RU); and Anton Sergeevich Orlov, Krasnoyarsk (RU)
Assigned to OBSCHESTVO S OGRANICHENNOY OTVETSTVENNOST'YU “OBEDINENNAYA KOMPANIYA RUSAL INZHENERNO—TEKHNOLOGICHESKIY TSENTR”, Krasnoyarsk (RU)
Appl. No. 18/038,670
Filed by Obshchestvo S Ogranichennoy Otvetstvennost'yu “Obedinennaya Kompaniya Rusal Inzhenerno-Tekhnologicheskiy Tsentr”, Krasnoyarsk (RU)
PCT Filed Oct. 18, 2021, PCT No. PCT/RU2021/050344
§ 371(c)(1), (2) Date May 24, 2023,
PCT Pub. No. WO2022/114998, PCT Pub. Date Jun. 2, 2022.
Claims priority of application No. 2020138638 (RU), filed on Nov. 25, 2020.
Prior Publication US 2024/0011177 A1, Jan. 11, 2024
Int. Cl. C25C 7/02 (2006.01); C25C 1/02 (2006.01)
CPC C25C 7/025 (2013.01) [C25C 1/02 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for lining a cathode assembly of an electrolytic cell for aluminum production including:
filling and levelling of a heat insulation layer (1) on a bottom of a cathode shell (9) of the cathode assembly;
filling a refractory layer (4) on top of the insulation layer;
installing cathode blocks (5) and side blocks (7) with subsequent sealing of seams (6) between the cathode blocks (5) and between the side blocks (7) with a cold ramming paste and subsequent monolithic baking, wherein:
the levelled heat insulation layer (1) is covered with a lower barrier layer of graphite foil (3) placed between layers of fiberboard sheets (2) with density of 950 kg/m3 or higher;
at least one refractory layer (4) is formed;
an upper barrier layer of graphite foil (3) placed between the layers of fiberboard sheets (2) with density of 950 kg/m3 or higher is installed;
all formed layers (1, 2, 3, 4) are simultaneously compacted to achieve alignment of an upper surface of an uppermost layer of the fiberboard sheets (2) with a plane of a lower edge (10) of cathode collector bar ports (8) in the cathode shell (9) and
a levelling refractory layer (4) of 20-30 mm thick is formed above the uppermost layer of the fiberboard sheets (2).