Bath for electrolytic reduction of alumina and method therefor

Brown, Craig W; Brooks, Richard J; Frizzle, Patrick B; Juric, Drago D

Title: Bath for electrolytic reduction of alumina and method therefor

Abstract

An electrolytic bath for use during the electrolytic reduction of alumina to aluminum. The bath comprises a molten electrolyte having the following ingredients: (a) AlF.sub.3 and at least one salt selected from the group consisting of NaF, KF, and LiF; and (b) about 0.004 wt. % to about 0.2 wt. %, based on total weight of the molten electrolyte, of at least one transition metal or at least one compound of the metal or both. The compound may be, for example, a fluoride, oxide, or carbonate. The metal can be nickel, iron, copper, cobalt, or molybdenum. The bath can be employed in a combination that includes a vessel for containing the bath and at least one non-consumable anode and at least one dimensionally stable cathode in the bath. Employing the bath of the present invention during electrolytic reduction of alumina to aluminum can improve the wetting of aluminum on a cathode by reducing or eliminating the formation of non-metallic deposits on the cathode.

Inventors:

Brown, Craig W ^[1]; Brooks, Richard J ^[1]; Frizzle, Patrick B ^[2]; Juric, Drago D ^[3]

Seattle, WA
Lynnwood, WA
Bulleen, AU

Issue Date:: 2001-07-10

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

OSTI Identifier:: 873838

Patent Number(s):: 6258247

Application Number:: 09/247,196

Assignee:: Northwest Aluminum Technology (Dalles, OR)

Patent Classifications (CPCs):: C - CHEMISTRY C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES C25C - PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS

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C - CHEMISTRY C25 - ELECTROLYTIC OR ELECTROPHORETIC PROCESSES C25C - PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS
C25C3/18 - Electrolytes

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DOE Contract Number:: 310468-A-UF

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: bath; electrolytic; reduction; alumina; method; aluminum; comprises; molten; electrolyte; following; ingredients; alf; salt; selected; consisting; naf; kf; lif; 004; wt; based; total; weight; transition; metal; compound; example; fluoride; oxide; carbonate; nickel; iron; copper; cobalt; molybdenum; employed; combination; vessel; containing; non-consumable; anode; dimensionally; stable; cathode; employing; improve; wetting; reducing; eliminating; formation; non-metallic; deposits; non-consumable anode; molten electrolyte; transition metal; electrolytic reduction; dimensionally stable; total weight; salt selected; electrolytic bath; bath comprises; /205/

Citation Formats


                    Brown, Craig W, Brooks, Richard J, Frizzle, Patrick B, and Juric, Drago D. Bath for electrolytic reduction of alumina and method therefor.  United States: N. p., 2001. 
        Web.

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                    Brown, Craig W, Brooks, Richard J, Frizzle, Patrick B, & Juric, Drago D. Bath for electrolytic reduction of alumina and method therefor.  United States.

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                    Brown, Craig W, Brooks, Richard J, Frizzle, Patrick B, and Juric, Drago D. Tue .  
        "Bath for electrolytic reduction of alumina and method therefor".  United States.  https://www.osti.gov/servlets/purl/873838.

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@article{osti_873838,

  title        = {Bath for electrolytic reduction of alumina and method therefor},

  author       = {Brown, Craig W and Brooks, Richard J and Frizzle, Patrick B and Juric, Drago D},

  abstractNote = {An electrolytic bath for use during the electrolytic reduction of alumina to aluminum. The bath comprises a molten electrolyte having the following ingredients: (a) AlF.sub.3 and at least one salt selected from the group consisting of NaF, KF, and LiF; and (b) about 0.004 wt. % to about 0.2 wt. %, based on total weight of the molten electrolyte, of at least one transition metal or at least one compound of the metal or both. The compound may be, for example, a fluoride, oxide, or carbonate. The metal can be nickel, iron, copper, cobalt, or molybdenum. The bath can be employed in a combination that includes a vessel for containing the bath and at least one non-consumable anode and at least one dimensionally stable cathode in the bath. Employing the bath of the present invention during electrolytic reduction of alumina to aluminum can improve the wetting of aluminum on a cathode by reducing or eliminating the formation of non-metallic deposits on the cathode.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2001},

  month        = {7}

}

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Works referenced in this record:

Principles of Aluminum Electrolysis
book, January 2016

Haupin, Warren E.; Bearne, Geoff; Dupuis, Marc
Essential Readings in Light Metals, p. 3-11
https://doi.org/10.1007/978-3-319-48156-2_1

The wettability of TiB2-based cathodes in low-temperature slurry-electrolyte reduction cells
journal, May 1998

Brown, Craig W.
JOM, Vol. 50, Issue 5
https://doi.org/10.1007/s11837-998-0031-1

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Title: Bath for electrolytic reduction of alumina and method therefor

Abstract

Citation Formats

Principles of Aluminum Electrolysis book, January 2016

The wettability of TiB2-based cathodes in low-temperature slurry-electrolyte reduction cells journal, May 1998

Principles of Aluminum Electrolysis
book, January 2016

The wettability of TiB2-based cathodes in low-temperature slurry-electrolyte reduction cells
journal, May 1998