EP3241927A1 - Revêtement d'électrolyseur pour la production d'aluminium - Google Patents

Revêtement d'électrolyseur pour la production d'aluminium Download PDF

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Publication number
EP3241927A1
EP3241927A1 EP15875779.9A EP15875779A EP3241927A1 EP 3241927 A1 EP3241927 A1 EP 3241927A1 EP 15875779 A EP15875779 A EP 15875779A EP 3241927 A1 EP3241927 A1 EP 3241927A1
Authority
EP
European Patent Office
Prior art keywords
cover
central
electrolysis cell
sections
electrolysis
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.)
Withdrawn
Application number
EP15875779.9A
Other languages
German (de)
English (en)
Other versions
EP3241927A4 (fr
Inventor
Aleksandr Olegovich GUSEV
Dmitriy Aleksandrovich SIMAKOV
Oleg Valentinovich SLUCHENKOV
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.)
Rusal Engineering and Technological Center LLC
Original Assignee
Rusal Engineering and Technological Center LLC
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 Rusal Engineering and Technological Center LLC filed Critical Rusal Engineering and Technological Center LLC
Publication of EP3241927A1 publication Critical patent/EP3241927A1/fr
Publication of EP3241927A4 publication Critical patent/EP3241927A4/fr
Withdrawn legal-status Critical Current

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    • 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
    • C25C3/10—External supporting frames or structures
    • 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
    • C25C3/22—Collecting emitted gases

Definitions

  • the invention relates to non-ferrous metallurgy, more particularly to producing aluminium by electrolysis, and even more particularly to a structural element for covering the space above a melt in an electrolysis cell for producing aluminium by the electrolysis of cryolite-alumina melts.
  • the most important factor defining electrolysis cell performance is the hermetic sealing of a cover above a melt.
  • the hermetic sealing of the electrolysis cell cover is directly associated with aluminium production costs because of its impact on heat and energy balance, raw material consumption and environment.
  • the primary electrolysis cell cover has following main purposes:
  • the surface area of a cryolite-alumina crust for covering the operating space of electrolysis cell having inert anodes is three times more than that of a standard bath.
  • the cryolite-alumina crust cannot hermetically seal the electrolysis cell across such big surface area because of strength, porous structure, occurring chemical reactions and instability of the surface integrity.
  • US Patent 5582695 IPC C04B 7/32, C04B 14/04, C04B 14/02, C04B 14/30 published on 10.12.1996 is known.
  • the invention relates to structural elements of aluminium electrolysis cells contacting a gaseous phase, in particular, it relates to covers and anode casings.
  • the aim of this patent is, as disclosed in the specification, to address the problem of hermetic sealing of the space between side boards and anodes of an electrolysis cell having a self-baking anode, in particular it is related to the replacement of a current cryolite-alumina cover consisting of a cast-iron (steel) gas-collecting bell and a cryolite-alumina crust with an "artificial" cover.
  • the suggested «artificial» cover is made as one piece or as a combined piece made of the refractory concrete having following composition: 15-30 wt% of hydraulic concrete, 5-10 wt% of microsilica, 65-80 wt% of alumina.
  • the invention relates to structural elements of a cover and a supply system of aluminium electrolysis cells, in particular to the creation of a sealing cover above electrolyte of the aluminium electrolysis cell at low-temperature operation.
  • One of the conditions of the manufacturing technology is the creation of a gel-like layer on the electrolyte surface, which is provided by electrolyte surface isolation with an «artificial» cover structure of enhanced heat insulation properties.
  • the electrolysis cell cover consists of a central section arranged in a central space between anodes along the entire length of a bath.
  • the central section of the cover is secured to a gas pipe beam and is fixed against movement, can comprise several sections, the cover movement is not envisaged.
  • Lateral sections of electrolysis cell cover are movable, can be provided in the form of several lateral sections, which are movable independently from each other and from the central cover.
  • the electrolysis cell cover is made from a ceramic material (e.g., alumina).
  • US Patent No2005230265 IPC C25C3/08, B01D59/40, B01D59/00, C25C3/00, C25C5/04, C25C7/00 published on 20.10.2005 is known.
  • This invention relates to structural elements of aluminium electrolysis cells contacting a vapour-gas phase of an electrolysis cell, in particular to a cover structure of the upper part of electrolysis cells having backed or inert anodes.
  • the aim of this patent is to eliminate heat losses of an electrolysis cell, namely, to reduce heat transfer from a cover to an environment, to reduce heat consumption for dissolution of the cover fallen into a melt, to reduce heat losses by means of heat balance stabilization and maintaining the operation space shape.
  • an artificial cover for an electrolyte melt is made in the form of sections movable separately.
  • sections of an "artificial" cover above an electrolyte melt are made in the form suspended structures. Based on their location, covers are peripheral and central. Peripheral cover sections are made in the form of suspended elements movable separately from each other, from the cover central section and from anodes.
  • a cover section for the electrolysis cell central space is made in the form of the one-piece element or in the form of several sections.
  • the central cover is extended along the entire length of the electrolysis cell; cover sections are fixed by means of suspended fasteners and are movable with respect to the melt separately from anodes.
  • the central cover structure is provided with operational doors and apertures, thus, allowing for production operations, bath feeding with raw material, and work with an anode assembly.
  • peripheral and central covers are made so that cover lifting and replacement can be done in compliance with the anode horizontal arrangement, in other words, actions with the cover wouldn't impact the stability of the current load.
  • Materials resistant to oxygen and fluoride e.g., ceramics or composite materials of a casing based on the nickel-titanium alloys and a heat insulator are suggested for use as the cover material.
  • the central cover is secured in the way that makes the cover movable independently from anodes; it inhibits replacement of a failured cover without affecting anodes and stability of electrolysis cell operation. Taking into account the cover section material, the need for periodic replacement of cover section arises. Another significant drawback is a cover material:
  • the object of the invention is to provide a multifunctional sectional «artificial» cover above electrolyte melt in electrolysis cells having an inert, backed anode and a Soderberg anode, which shows corrosion and erosion resistance to an aggressive vapour-gas environment of electrolysis cells.
  • the technical effect of the present invention is to provide a hermetically sealed cover, a reliable and safe structure, and a reduction in energy consumption.
  • a cover for an electrolysis cell for producing aluminium which is in contact with a vapour-gas phase when the electrolysis cell is in operation and which is in the form of central and peripheral sections which are movably arranged relative to each other, the central and peripheral sections are made of a corrosion and erosion-resistant material which comprises 80.0-99.0 wt% of fluorophlogopite and 20.0-1.0 wt% of a refractory filler.
  • the central sections of the cover may be permanently fixed on each anode rod, and the peripheral sections may be configured as convex panels rigidly and removably fixed on the top surface of a cathode and supported by the central section of the cover.
  • the refractory filler may be chosen from the following chemical substances: clay, calcium fluoride, rutile, sodium aluminosilicate, fluorapophyllite, nepheline, olivine, magnesium fluoride, and spinel.
  • the end and side joints of the central and peripheral covers may be coated with a sealant layer in the form of a layer of alumina, and the central section of the cover may be provided with apertures.
  • fluorophlogopite cover is a chemical composition of an agglomerate in terms of the main component KMg3(Si3Al)O 10 F 2 * , because the change of material chemical purity results in the change of physical and chemical properties of the material, and consequently, its mechanical strength, heat conductivity, and corrosion and erosion resistance.
  • fluorophlogopite is used as the cover material, it is required to use the material containing the main component, fluorophlogopite, in the range of 80-99%, which will allow flexible usage of materials for different types of electrolysis cells.
  • fluorophlogopite ensures melt and aluminium purity.
  • Operational apertures in the central section of the cover allow using the cover for electrolysis cell feeding, cover installation and disassembling, and maintenance operations.
  • alumina is used, which is chemically similar to the fluorophlogopite material.
  • Operational through-apertures in the ends of the cover central section in the electrolysis cell center provide removal of the gas-air mixture from the electrolysis cell to a gas removal system.
  • the procedure for preparation of the electrolysis cell having the claimed cover includes following steps:
  • the electrolysis cell cover according to the suggested solution features improved reliability, provided by not only the corrosion and erosion resistance of a cover material but also by an independent structural feature of the sectional cover allowing access to any part of the electrolysis cell in a short time without significant intervention in the process.
  • thermal expansion of the cover material is prevented due to the material properties, allowing free movement of the cover along adjacent covers.

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)
EP15875779.9A 2014-12-29 2015-10-28 Revêtement d'électrolyseur pour la production d'aluminium Withdrawn EP3241927A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2014154035/02A RU2582421C1 (ru) 2014-12-29 2014-12-29 Укрытие электролизера для производства алюминия
PCT/RU2015/000716 WO2016108726A1 (fr) 2014-12-29 2015-10-28 Revêtement d'électrolyseur pour la production d'aluminium

Publications (2)

Publication Number Publication Date
EP3241927A1 true EP3241927A1 (fr) 2017-11-08
EP3241927A4 EP3241927A4 (fr) 2018-11-14

Family

ID=55794460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15875779.9A Withdrawn EP3241927A4 (fr) 2014-12-29 2015-10-28 Revêtement d'électrolyseur pour la production d'aluminium

Country Status (7)

Country Link
US (1) US20170362726A1 (fr)
EP (1) EP3241927A4 (fr)
CN (1) CN107532318A (fr)
AU (1) AU2015372636A1 (fr)
CA (1) CA2972640A1 (fr)
RU (1) RU2582421C1 (fr)
WO (1) WO2016108726A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2698162C2 (ru) 2017-03-01 2019-08-22 Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" Перфорированный металлический инертный анод для получения алюминия электролизом расплава

Family Cites Families (25)

* Cited by examiner, † Cited by third party
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SU274933A1 (ru) * 1969-04-21 1977-12-05 Sprygin A I Способ защиты футеровки магниевых электролизеров от электрохимического разрушени
NO172250C (no) * 1990-05-07 1993-06-23 Elkem Aluminium Anordning for lukking av anodetoppen paa en soederberganodei en elektrolysecelle for fremstilling av aluminium
FR2694945B1 (fr) * 1992-08-20 1994-10-07 Pechiney Aluminium Superstructure de cuve d'électrolyse de très haute intensité pour la production d'aluminium.
NO180206C (no) * 1992-11-30 1997-03-05 Elkem Aluminium Konstruksjonsdeler for aluminiumelektrolyseceller
WO1999002763A1 (fr) * 1997-07-08 1999-01-21 Moltech Invent S.A. Conception relative a une cellule d'electrolyse pour la production d'aluminium
CN2479028Y (zh) * 2001-05-28 2002-02-27 郑州轻金属研究院沁阳铝电解试验厂 推拉式槽罩板
DE60315974T2 (de) * 2002-06-04 2008-05-21 Moltech Invent S.A. Design einer zelle zur elektrolytischen gewinnung von aluminium mit beweglichen ioslierabdeckungsteilen
CA2503902A1 (fr) * 2002-12-04 2004-06-17 Moltech Invent S.A. Cellule electrolytique a dispositif d'alimentation ameliore
CN2641063Y (zh) * 2003-06-13 2004-09-15 沈阳铝镁设计研究院 电解槽的一种槽侧密封罩板
RU2288976C1 (ru) * 2005-05-04 2006-12-10 Общество с ограниченной ответственностью "Инженерно-технологический центр" Ошиновка модульная мощных электролизеров для производства алюминия
RU2316618C2 (ru) * 2006-02-16 2008-02-10 Открытое акционерное общество "РУСАЛ ВСЕРОССИЙСКИЙ АЛЮМИНИЕВО-МАГНИЕВЫЙ ИНСТИТУТ" (ОАО "РУСАЛ ВАМИ") Электролизер для получения магния и хлора
RU2361017C2 (ru) * 2007-05-23 2009-07-10 Закрытое акционерное общество "УНИХИМТЕК" (ЗАО "УНИХИМТЕК") Защитный состав, композиционный материал на его основе для вторичного укрытия электролизера и способ изготовления материала
RU2375504C2 (ru) * 2007-12-11 2009-12-10 Общество с ограниченной ответственностью "Русская инжиниринговая компания" Укрытие алюминиевого электролизера с самообжигающимся анодом и верхним токоподводом
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WO2012021924A1 (fr) * 2010-08-16 2012-02-23 Aluminium Smelter Developments Pty Ltd Cassette d'anodes sans tige
CN201809455U (zh) * 2010-08-18 2011-04-27 中国铝业股份有限公司 一种铝电解槽槽盖板密封装置
CN202000002U (zh) * 2011-03-24 2011-10-05 运城市关铝设备材料有限公司 一种电解槽防腐蚀防变形新型保温密封槽罩
CN202246906U (zh) * 2011-09-15 2012-05-30 高德金 铝电解槽无绝缘槽盖板
CN202881410U (zh) * 2012-10-18 2013-04-17 郑州龙祥铝业有限公司 电解槽及其打壳锤与水平罩的密封装置
CN203360593U (zh) * 2013-05-08 2013-12-25 戴军 铝电解槽节能密封保温高强度槽罩
CN203700545U (zh) * 2013-12-05 2014-07-09 贵州新峰机电设备有限公司 一种密闭型保温电解槽槽罩
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CN204039517U (zh) * 2014-07-01 2014-12-24 湖州市织里新飞铝业有限公司 一种铝电解槽覆盖料阻料装置
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Also Published As

Publication number Publication date
US20170362726A1 (en) 2017-12-21
CN107532318A (zh) 2018-01-02
EP3241927A4 (fr) 2018-11-14
CA2972640A1 (fr) 2016-07-07
RU2582421C1 (ru) 2016-04-27
AU2015372636A1 (en) 2017-08-17
WO2016108726A1 (fr) 2016-07-07

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