quest
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powder Al fromsanding
hi,
A friend of mine works with Al and he can give me some leftovers of it after sanding.
But the problam is (i think) that the Al is burned when he sanded it.
i mean that when you sand Al you get sparks and i think its not pure Al anymore.....
what can i do to make it pure?
do you thin its realy Al oxide?
thx
[Edited on 19-11-2003 by quest]
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Marvin
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Depends on how its been sanded, it could be mostly Al, or entirly oxide.
One way to find out, would be to weigh an amount of aluminium, put it under water, invert a glass of water over it, and add sodium hydroxide. The
aluminium will produce hydrogen and sodium aluminate. Knowing the volume of hydrogen gas produced measure by keeping the liquid level inside the
glass the same as outside, and the weight of aluminium, gets you hot pure it is. you can do a blank test with a solid block of aluminium if you dont
want the hassle of the maths.
Not likley to be very accurate at a home test, but should be good enough to tell you if your wasting your time.
Wear gloves or the NaOH will do a number on your skin.
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Iv4
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Its not just AL oxides you have to worry about but also bits of the belt that usually come of on it.
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chloric1
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cutting is better
Personally I prefer shavings from cutting because there is less tool to product stock contact and you get a purer product. I would avoid sandings as
the sand may contain boron or ??? and would discolor any pyro mix. Try to get scrap from a band saw or jig saw or simular processing. Oh, never
hurst to wash with alcohol or acetone
[Edited on 11/20/2003 by chloric1]
Fellow molecular manipulator
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vulture
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Hmm, how about grinding with carbon?
I don't know the relative hardness of C versus Al, but if it works it should have some advantages.
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
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quest
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OK
i dont think i could make what Marvin wrote.......any other ways to test it?
and if it is realy Al oxide.......is there any way to make it pure again? maybe elctolisis?
and vulture
the Al i get its leftovers
i cant ask him to start sanding with carbon........if I under stand what you say.....
[Edited on 20-11-2003 by quest]
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quest
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my post is going down.................and i diden't got an answer to my question
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vulture
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Demanding answers is not how a message board works! This is NOT a chatroom!
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
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Iv4
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Industrially AL powder is made by spraying molten AL into a coolling blanket of some sort.
The nano size stuff is made by electroexplosions and laser sublimation usually.Only know shit about electrexplosions( the average particle size for AL
that way is around 100nm).
[Edited on 22-11-2003 by Iv4]
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quest
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| Quote: | Originally posted by vulture
Demanding answers is not how a message board works! This is NOT a chatroom! |
sorry but i jut want an answer
i didn't demanded...........im sorry if it sound like that
but my post was almost in the next page and i didn't got any answer
hope to get answer soon..........
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Organikum
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No, there is no practical way IMHO to revive the Al sandings. (opinion based on effort)
Get some Al-paint and wash with acetone and bingo: 1a Al powder.
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