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  1. 11-10-2011, 06:19 PM #1
    eesakiwi
    eesakiwi is offline Metal Recycling Entrepreneur
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    I have had a look around the net about Magnesium & found that some say that,
    "If you put a drop of vinegar on Ali it does nothing & if you put a drop on Magnesium it bubbles a lot."

    If you do the same with a Silver nitrate solution (its probably hard to get, Chemists maybe?)
    On Ali it does nothing, on Magnesium it turns black & leaves a black spot on the metal. (precipitation of silver)



    Magnesium burns brightly when touched with a welders flame (Oxy/Acetylene-probably! Butane?)
    Ali dosen't. I sorta guessed that too.....

    Prices for Magnesium seem to be hard to find, our scrappers don't buy it, but wouldn't know the difference if you put it in with the Ali anyway.

    One price I did get, from http://www.armetalrecyclers.com/scrap-metal-prices.html
    is $US3.20 a Kg (gee, mixed metric again...) NZ$4 a Kg. Or.....
    US$1.45 - Lb

    Theres a lot of mentions of 'water not putting out a magnesium fire', I knew that, I better find a better place to store mine now. I just have it in a sack outside.
    I have noticed that when it corrodes (rusts) it leaves big 'spots' of built up powder.
    Ali just corrodes in patches & from edges & bends etc.

    This site has a lot of good info about the recycling of most metals, even titanium..
    http://www.themetalcasting.com/magnesium-scrap.html
    Last edited by eesakiwi; 11-10-2011 at 06:29 PM.

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  3. 11-11-2011, 09:36 AM #2
    harrisvh
    harrisvh is offline Metal Recycling Entrepreneur
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    Magnesium will do these things and is very flammable as you say, however these are not the properties of it's alloys. Most of its alloys are alloyed with aluminium anyway, increasing its strength whilst keeping its low density. It's alloys are perfectly safe to store as normal. It is highly unlikely that the average person will come into contact with pure magnesium scrap as it will come with a highly flammable hazard symbol and isn't used to make items on it's own. If you do it is most likely you will see it in flares as it is used in powder form in the signal flare cartridges. Aluminium will react with silver nitrate though how long it takes depends on how thick it's oxide layer is.
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