EP2862962A1 - Elektrolyt zur elektrolyse von aluminium und elektrolyseverfahren mit dem elektrolyt - Google Patents

Elektrolyt zur elektrolyse von aluminium und elektrolyseverfahren mit dem elektrolyt Download PDF

Info

Publication number
EP2862962A1
EP2862962A1 EP20130804761 EP13804761A EP2862962A1 EP 2862962 A1 EP2862962 A1 EP 2862962A1 EP 20130804761 EP20130804761 EP 20130804761 EP 13804761 A EP13804761 A EP 13804761A EP 2862962 A1 EP2862962 A1 EP 2862962A1
Authority
EP
European Patent Office
Prior art keywords
electrolyte
naf
electrolysis
alf
lif
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Withdrawn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
EP20130804761
Other languages
English (en)
French (fr)
Other versions
EP2862962A4 (de
Inventor
Songtao SUN
Yulin FANG
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.)
Inner Mongolia United Industrial Co Ltd
Original Assignee
Inner Mongolia United Industrial Co Ltd
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
Priority claimed from CN201210188422.7A external-priority patent/CN103484897B/zh
Priority claimed from CN201310024018.0A external-priority patent/CN103938227A/zh
Application filed by Inner Mongolia United Industrial Co Ltd filed Critical Inner Mongolia United Industrial Co Ltd
Publication of EP2862962A1 publication Critical patent/EP2862962A1/de
Publication of EP2862962A4 publication Critical patent/EP2862962A4/de
Withdrawn legal-status Critical Current

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
    • C25C3/18—Electrolytes

Definitions

  • the present invention relates to an electrolyte for aluminum electrolysis and an electrolysis process using the electrolyte, belonging to non-ferrous metal smelting industry.
  • Aluminum electrolysis refers to acquisition of aluminum by means of an electrolysis method.
  • a traditional Hall-Heroult molten salt aluminum electrolysis process is typically adopted for aluminum electrolysis.
  • This process is featured by use of a cryolite-alumina molten salt electrolysis method in which cryolite Na 3 AlF 6 fluoride salt melt is taken as flux, Al 2 O 3 is dissolved in fluoride salt, carbon body is taken as an anode, aluminum liquid is taken as a cathode, and electrolytic aluminum is obtained by performing electrochemical reaction at the anode and cathode of the electrolytic cell at a high temperature ranging from 940 to 960°C after a strong direct current is introduced. Due to high electrolysis temperature, the traditional aluminum electrolysis process has such characteristics as large volatilization amount of electrolyte, large oxidization loss of a carbon anode, large energy consumption, large thermal loss and poor electrolysis working environment.
  • the molten salt composition of the system includes AlF 3 , Al 2 O 3 and one or more salts selected from the group consisting of KF, NaF, MgF 2 , CaF 2 , NaCl, LiF, and BaF 2 , wherein according to mole percentage, the content of AlF 3 is 22-50%, the content of Al 2 O 3 is 1-25% and the content of the rest components is 25-77%.
  • the electrolysis temperature of the electrolyte can be lowered to be within a wide area from 680°C to 900°C for the purpose of operations.
  • an electrolyte can be successfully applied to industrial production is based on comprehensive consideration for many factors like its liquidus temperature, volatility, electric conductivity, alumina solubility, preparation environment and whether stable electrolysis process can be guaranteed, however, due to the above problems in the prior art, industrial application of the electrolyte is significantly limited, and it is an unsolved problem in the prior art to find a way of avoiding corrosion to electrolysis devices and damage to human body and ensuring proper electric conductivity and alumina solubility as well as no 'crusting' phenomenon of the prepared electrolyte while the liquidus temperature of the electrolyte is further lowered.
  • the technical problem to be solved by the present invention is that, the prior art is incapable of avoiding corrosion to electrolysis devices and damage to human body and ensuring proper electric conductivity and alumina solubility as well as no 'crusting' phenomenon of the prepared electrolyte while the liquidus temperature of the electrolyte is further lowered.
  • the present invention provides an electrolyte for aluminum electrolysis, which is low in liquidus temperature, free from corrosion to an electrolytic cell, not liable to volatilization, proper in electric conductivity and alumina solubility and free from 'crusting' phenomenon, and an electrolysis process using the electrolyte.
  • An electrolyte for aluminum electrolysis is composed of the following components by mass percent: 20-29.9% of NaF, 60.1-66% of AlF 3 , 3-10% of LiF, 4-13.9% of KF and 3-6% of Al 2 O 3 , wherein the molar ratio of NaF to AlF 3 is 0.6-0.995; or composed of the following components by mass percent: 30-38% of NaF, 49-60% of AlF 3 , 1-5% of LiF, 1-6% of KF and 3-6% of Al 2 O 3 , wherein the molar ratio of NaF to AlF 3 is 1.0-1.52.
  • the molar ratio of NaF to AlF 3 is 0.6-0.7 or 1.12-1.52.
  • the liquidus temperature of the electrolyte ranges from 620 to 670°C.
  • the liquidus temperature of the electrolyte ranges from 640 to 670°C.
  • the electrolysis temperature of the electrolyte ranges from 720 to 760°C.
  • An electrolysis process using the electrolyte for aluminum electrolysis comprises the steps of:
  • the melt prepared in step (1) is electrolyzed at 730-750°C.
  • Al 2 O 3 is quantitatively supplied in the electrolysis process.
  • the electrolysis temperature is further set within a range from 730 to 750°C in the present invention.
  • the components of the electrolyte in this embodiment are as follows: 20% of NaF, 65.98% of AlF 3 , 5.01% of LiF, 6.01% of KF and 3% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 0.6.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 640°C.
  • the components of the electrolyte in this embodiment are as follows: 29.9% of NaF, 60.1 % of AIF3, 3% of LiF, 4% of KF and 3% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF3 is 0.995.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 670°C.
  • the components of the electrolyte in this embodiment are as follows: 20% of NaF, 66% of AlF 3 , 4% of LiF, 4% of KF and 6% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 0.6.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 640°C.
  • the components of the electrolyte in this embodiment are as follows: 21% of NaF, 60.1% of AlF 3 , 10% of LiF, 5.9% of KF and 3% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 0.7.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 640°C.
  • the components of the electrolyte in this embodiment are as follows: 20% of NaF, 60.1% of AlF 3 , 3% of LiF, 13.9% of KF and 3% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 0.67.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 620°C.
  • the components of the electrolyte in this embodiment are as follows: 20% of NaF, 61 % of AlF 3 , 9% of LiF, 4% of KF and 6% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 0.65.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 670°C.
  • the components of the electrolyte in this embodiment are as follows: 13% of NaF, 60% of AlF 3 , 10% of LiF, 12% of KF and 5% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 0.43.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 660°C.
  • the components of the electrolyte in this embodiment are as follows: 32% of NaF, 57% of AlF 3 , 3% of LiF, 4% of KF and 4% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 1.12.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 640°C.
  • the components of the electrolyte in this embodiment are as follows: 38% of NaF, 50% of AlF 3 , 2% of LiF, 5% of KF and 5% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 1.52.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 670°C.
  • the components of the electrolyte in this embodiment are as follows: 32% of NaF, 57% of AlF 3 , 3% of LiF, 4% of KF and 4% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 1.12.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 640°C.
  • the components of the electrolyte in this embodiment are as follows: 32% of NaF, 57% of AIF3, 3% of LiF, 4% of KF and 4% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF3 is 1.12.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 640°C.
  • the components of the electrolyte in this embodiment are as follows: 30% of NaF, 60% of AIF3, 1% of LiF, 6% of KF and 3% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AIF3 is 1.0.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that: the liquidus temperature of the electrolyte in this embodiment is 620°C.
  • the components of the electrolyte in this embodiment are as follows: 38% of NaF, 54% of AlF 3 , 4% of LiF, 1 % of KF and 3% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AlF 3 is 1.4.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 670°C.
  • the components of the electrolyte in this embodiment are as follows: 34% of NaF, 49% of AlF 3 , 5% of LiF, 6% of KF and 6% of Al 2 O 3 , wherein the molar ratio of NaF to aluminum fluoride AIF3 is 1.39.
  • the performances of the electrolyte in this embodiment are measured and the measurement result is that the liquidus temperature of the electrolyte in this embodiment is 660°C.
  • the electrolytic cells used in the electrolysis processes in the aforementioned embodiments are continuous pre-baked anode electrolytic cells having an anode current density of 0.8A ⁇ cm -2 .
  • the electrolyte described in the present invention is applicable to any electrolytic cell in the prior art.

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)
  • Conductive Materials (AREA)
EP13804761.8A 2012-06-11 2013-05-30 Elektrolyt zur elektrolyse von aluminium und elektrolyseverfahren mit dem elektrolyt Withdrawn EP2862962A4 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201210188422.7A CN103484897B (zh) 2012-06-11 2012-06-11 一种电解铝用电解质以及使用该电解质的电解工艺
CN201310024018.0A CN103938227A (zh) 2013-01-23 2013-01-23 电解铝用电解质以及使用该电解质的电解工艺
PCT/CN2013/076442 WO2013185540A1 (zh) 2012-06-11 2013-05-30 一种电解铝用电解质以及使用该电解质的电解工艺

Publications (2)

Publication Number Publication Date
EP2862962A1 true EP2862962A1 (de) 2015-04-22
EP2862962A4 EP2862962A4 (de) 2015-12-09

Family

ID=49757500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13804761.8A Withdrawn EP2862962A4 (de) 2012-06-11 2013-05-30 Elektrolyt zur elektrolyse von aluminium und elektrolyseverfahren mit dem elektrolyt

Country Status (10)

Country Link
US (1) US20150122665A1 (de)
EP (1) EP2862962A4 (de)
KR (1) KR101801453B1 (de)
AP (1) AP2015008185A0 (de)
AU (1) AU2013275997B2 (de)
CA (1) CA2876345C (de)
EA (1) EA032047B1 (de)
IN (1) IN2015DN00211A (de)
WO (1) WO2013185540A1 (de)
ZA (1) ZA201409514B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11026422B2 (en) 2017-09-26 2021-06-08 Ecolab Usa Inc. Acid/anionic antimicrobial and virucidal compositions and uses thereof
CN115110120B (zh) * 2022-06-22 2024-01-23 中国铝业股份有限公司 一种降低铝电解全氟化碳排放量的方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB891369A (en) * 1959-12-22 1962-03-14 Harvey Lester Slatin Electrolytic production of aluminum
US5006209A (en) * 1990-02-13 1991-04-09 Electrochemical Technology Corp. Electrolytic reduction of alumina
US5284562A (en) * 1992-04-17 1994-02-08 Electrochemical Technology Corp. Non-consumable anode and lining for aluminum electrolytic reduction cell
US6258247B1 (en) * 1998-02-11 2001-07-10 Northwest Aluminum Technology Bath for electrolytic reduction of alumina and method therefor
US7077945B2 (en) * 2002-03-01 2006-07-18 Northwest Aluminum Technologies Cu—Ni—Fe anode for use in aluminum producing electrolytic cell
RU2318924C2 (ru) 2002-10-18 2008-03-10 Мольтех Инвент С.А. Электролизеры для получения алюминия электролизом с анодами на основе металлов
CN101671835A (zh) * 2008-09-09 2010-03-17 北京有色金属研究总院 铝电解的低温熔盐体系及使用该熔盐体系进行铝电解的方法
CN101709487A (zh) * 2009-12-18 2010-05-19 中国铝业股份有限公司 一种铝电解的电解质
CN102011144A (zh) 2010-12-15 2011-04-13 中国铝业股份有限公司 适用于金属熔盐电解槽惰性阳极的镍基合金材料
WO2013174065A1 (zh) * 2012-05-23 2013-11-28 深圳市新星轻合金材料股份有限公司 用于铝电解工业的低分子比冰晶石及其制备方法
WO2012159590A1 (zh) * 2012-05-23 2012-11-29 深圳市新星轻合金材料股份有限公司 铝电解过程中的电解质补充体系及其制备方法
CN103484891B (zh) * 2012-06-11 2016-06-15 内蒙古联合工业有限公司 一种电解铝用电解槽及使用该电解槽的电解工艺

Also Published As

Publication number Publication date
CA2876345A1 (en) 2013-12-19
AU2013275997A1 (en) 2015-01-22
AU2013275997B2 (en) 2016-06-16
KR20150022995A (ko) 2015-03-04
US20150122665A1 (en) 2015-05-07
ZA201409514B (en) 2016-06-29
IN2015DN00211A (de) 2015-06-12
EP2862962A4 (de) 2015-12-09
CA2876345C (en) 2017-03-14
EA032047B1 (ru) 2019-03-29
EA201492228A1 (ru) 2015-05-29
KR101801453B1 (ko) 2017-11-24
WO2013185540A1 (zh) 2013-12-19
AP2015008185A0 (en) 2015-01-31

Similar Documents

Publication Publication Date Title
CA2877591C (en) Electrolytic cell for aluminum electrolysis and electrolysis process using electrolytic cell
NO20160141A1 (en) Electrolyte for producing aluminum by molten electrolysis
CN102108529B (zh) 一种熔盐电解制备铝钆钐合金的方法
AU2013275997B2 (en) Electrolyte used for aluminum electrolysis and electrolysis process using the electrolyte
CN102703932B (zh) 铝电解过程中的电解质补充体系及其制备方法
CN103484897B (zh) 一种电解铝用电解质以及使用该电解质的电解工艺
US20240141529A1 (en) Method for producing metal aluminum by molten salt electrolysis of aluminum oxide
CN105803490A (zh) 一种用于铝电解的电解质组合物
CN103132108B (zh) 熔盐体系中电解制备耐热镁铝钕合金的方法
HAARBERG Electrowinning of Aluminum—Challenges and Possibilities for Reducing the Carbon Footprint—
OA17185A (en) Electrolyte used for aluminum electrolysis and electrolysis process using the electrolyte.
RU2276701C1 (ru) Электролит для получения алюминия (варианты)
CN103938227A (zh) 电解铝用电解质以及使用该电解质的电解工艺
Ma et al. Investigating current efficiency of aluminum electrolysis in NaF-KF-AlF 3 system
Haarberg The current efficiency for aluminium deposition from molten fluoride electrolytes with dissolved alumina
RU2266986C1 (ru) Электролит для получения алюминия
CN102628131B (zh) 一种铝镥镱合金及其熔盐电解制备方法
Tao et al. The influence of various LiF concentrations on the cathodic electrochemical behavior at the tungsten electrode in Na 3 AlF 6–Al 2 O 3 molten salt
Rolseth et al. An Inverted Aluminium Electrolysis Cell Using a High Density Electrolyte and an Inert Anode
Mean CURRENT EFFICIENCY

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20150112

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RA4 Supplementary search report drawn up and despatched (corrected)

Effective date: 20151109

RIC1 Information provided on ipc code assigned before grant

Ipc: C25C 3/18 20060101AFI20151103BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20190211

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20191203