An inert metal anode for magnesium electrowinning

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Results from the development of a novel type of anode for electrowinning Mg are reported. A tailored alloy system based on the binary Cu-Al can be made to form a thin alumina layer on its surface that is relatively impervious to attack by the molten chloride melt at high temperature. This barrier is thin enough (5--50 nm) to conduct electrical current without significant IR loss. As the layer slowly dissolves, the chemical potential developed at the surface drives the diffusion of aluminum from the bulk alloy to reform (heal) the protective alumina layer. In this way, an anode that generates ... continued below

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8 p.

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Moore, J. F.; Hryn, J. N.; Pellin, M. J.; Calaway, W. F. & Watson, K. December 1, 1999.

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Description

Results from the development of a novel type of anode for electrowinning Mg are reported. A tailored alloy system based on the binary Cu-Al can be made to form a thin alumina layer on its surface that is relatively impervious to attack by the molten chloride melt at high temperature. This barrier is thin enough (5--50 nm) to conduct electrical current without significant IR loss. As the layer slowly dissolves, the chemical potential developed at the surface drives the diffusion of aluminum from the bulk alloy to reform (heal) the protective alumina layer. In this way, an anode that generates Cl{sub 2} (melt electrolysis) and O{sub 2} (wet feed hydrolysis) and no chlorocarbons can be realized. Further, the authors expect the rate of loss of the anode to be dramatically less than the coke-derived carbon anodes typically in use for this technology, leading to substantial cost savings and ancillary pollution control by eliminating coke plant emissions, as well as eliminating chlorinated hydrocarbon emissions from Mg electrowinning cells.

Physical Description

8 p.

Notes

OSTI as DE00750611

Medium: P; Size: 8 pages

Source

  • The Minerals, Metals, and Materials Society (TMS) Annual Meeting, Nashville, TN (US), 03/12/2000--03/16/2000

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  • Report No.: ANL/ES/CP-100633
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 750611
  • Archival Resource Key: ark:/67531/metadc712050

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 1, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 11, 2017, 6:48 p.m.

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Moore, J. F.; Hryn, J. N.; Pellin, M. J.; Calaway, W. F. & Watson, K. An inert metal anode for magnesium electrowinning, article, December 1, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc712050/: accessed May 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.