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    basilrazi's Avatar
    basilrazi Posts: 27, Reputation: 2
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    #1

    Feb 15, 2009, 01:32 AM
    Aluminium extraction/reaction
    In the Hall-Héroult process I know the anode is carbon but what is the cathode made from?


    Also what are the by-products of the bayer process and the Hall-Héroult process
    rwinterton's Avatar
    rwinterton Posts: 289, Reputation: 15
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    #2

    Feb 15, 2009, 05:52 AM


    Usually the cathode would be made of the metal that's being deposited, Aluminum in this case. However, the process is hot enough to melt the aluminum. There are a number of patents so I think there are a number of different cathode materials. One is to use a carbon cathode as well as an anode. It's probably also possible to use copper or copper alloys as the cathode. You want it have a high melting point.

    Aluminium

    Sub-cathodic shield with deformable zones for Hall-Heroult electrolysis cells - US Patent 4488955 Claims

    http://www.springerlink.com/content/jj448352q1jgxg2k/
    basilrazi's Avatar
    basilrazi Posts: 27, Reputation: 2
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    #3

    Feb 16, 2009, 02:37 AM
    Quote Originally Posted by rwinterton View Post
    Usually the cathode would be made of the metal that's being deposited, Aluminum in this case. However, the process is hot enough to melt the aluminum. There are a number of patents so I think there are a number of different cathode materials. One is to use a carbon cathode as well as an anode. It's probably also possible to use copper or copper alloys as the cathode. You want it have a high melting point.

    Aluminium

    Sub-cathodic shield with deformable zones for Hall-Heroult electrolysis cells - US Patent 4488955 Claims

    SpringerLink - Journal Article
    Thanks
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