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jimwig
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Mumbles- can you be more specific as to the size of screens you are talking about.
Window screen I got. But other sizes as in standard screening sizes.
for instance window screen is probably around 35 or so.
I guess the idea is to get it as fine as possible and then classify it, eh? cause using our level of grinding/milling equipment would produce all
sizes eventually ???
I have stainless in sizes down to around a 80 and the idea of a 300 or finer screen blows me away. HaHa
[Edited on 30-5-2004 by jimwig]
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Mumbles
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I'm not exactly sure on the size of the super fine screen. I'd imagine 20-25 holes per 1" line. Thats somewhere between 400 and 625
mesh. I'll get out a magnifying glass and count them once I return to my mom's. I found it laying around the house, but can be purchased
at basically any grocery store. It's a permanant coffee filter. Quite a usefull little tool in screening things for pyro.
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Chemtastic
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Hi! This is my first post here, but I've been looking around for awhile, and this is a really great site.
I've never tried this method, but wouldn't it be possible to obtain aluminum powder by displacing a soluble metal cation with aluminum, then
displacing the aqueous aluminum with another, more reactive metal? For example:
First, Al(s) + 3CuCl(aq) --> AlCl3(aq) + 3Cu(s)
Then, 3Mg(s) + 2AlCl3(aq) --> 3MgCl2(aq) + 2Al(s)
The initial aluminum wouldn't have to be powdered (though surface area would help), and magnesium is available as firestarters for cheap at
WalMart (pretty high %age too, I think >97%)
Aluminum would crystallize out of solution, but would the crystals be small enough? I'm not sure; like I said, I've never tried this.
PS - How can BB Code be used for subscript and superscript?
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BromicAcid
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Aluminum obtained in this way, under water, one molecule at a time will undoubtedly contain a high percentage of aluminum oxide. I was once chastised
for mentioning this method on rec.pyrotechnics, turns out it was mentioned in one of the 'anarchist' texts floating around on the net and
had been tried extensively by some with dismal results.
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axehandle
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One way to prevent oxide forming could perhaps be to use ethanol as a solvent...? Aluminum chloride is soluable in ethanol I think --- the former is
the active ingredient in many antiperspirants.
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Chemtastic
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Then (sorry if this is a stupid question) where does the oxygen come from? Can elemental aluminum pull it right out of the water:
2Al(s) + 3H2O(l) --> Al2O3(s) + 3H2(g)?
I've never heard of water splitting into anything besides H+ and OH-
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axehandle
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Sorry if this is a stupid answer, but AFAIK, water always contains a small percentage of dissolved air in it, and that's where the oxygen comes
from. I could be amazingly wrong here, but this, to me, sounds like the most plausible explanation...
So, if one could remove all the air.........
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Chemtastic
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ooh good point...forgot about that...water at 75-90 C then, maybe...
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unionised
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Aluminium is a very good reducing agent, quite adequate for reducing water to hydrogen.
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axehandle
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Oh. Well, you learn something new every day...
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Hang-Man
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This process works well for both copper and zinc powder production, I have done them both with success. (Good enough for pyro anyway, if you need some
pure metal powders you're out of luck) Disolve Cu or Zn pennies in HCl, wait, and dump in Al to precipitate the powder.
(If someone can think of something to do with aluminum chloride tell me)
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Saerynide
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maybe you could electrolyse the AlCl3 with carbon electrodes to get a powdery Al coating on the cathode that could be easily scraped off?
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Organikum
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You would need anhydrous AlCl3 and then you could do an electrolysis on the molten salt. This is a old process of producing aluminium, before bauxite
electrolysis was developed. The Al would be not in a powder form though.
Anhydrous AlCl3 is highly hygroscopic, it fumes in contact with the moisture of air.
Aluminium reacts with water as it does with alcohols. It is only protected by a layer of aluminiumoxide.
The reaction with water:
Al +H2O = AlOH + H
BMW did tests with a utilizing this reaction where Al-wire was highspeed grinded under water producing hydrogen for a combustion engine.
Aluminium is used as a reducing agent in organic chemistry, for this the oxide layer is deactivated by amalgamating the aluminium with mercury.
At automotive supply shops high-temperature Al-spray is sold containing 99,9% Al. I am rather sure that emtying such a bottle into a suitable solvent
will produce very fine Al-powder. What solvent is to used depends on the composition of the spray, water and alcohol are for sure not suitable.
Mineral spirits, benzine, the high-boiling fraction, thats what I would suggest to try first. But I never did it myself up to now, so dont nail me if
it doesnt work.
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Saerynide
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So electrolysing aqueous AlCl3 would only give Al(OH)3? 
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sanity gone
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I think the blender method might produce a aluminum powder becuase I'm pretty sure they use a wax coating that would prevent the formation of
Al(OH)3
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Saerynide
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Has anyone tried to use aluminum glitter as a source? Like the paint method, I suppose one could remove the plastic coating on the glitter using
acetone or ethyl acetate. I think the sparkliest glitters are the Al ones, according to this link:
http://www.meadowbrookinventions.com/loband/glitter_products...
It's also extremely fine 
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AllanD
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| Quote: | Originally posted by 4s2
I was cleaning out my truck the other day when I stubled upon my E-Repair kit. In it was a small tube of powder called AlumaSeal- Radiator Sealer.
Inside the 20 gram tube, looks to be just finely ground aluminum. But Pouring aluminum into your radiator can't be good enough on its own. I wondered,
what ELSE is in this, what could be a way to extract the aluminum from it, and mostly, how does AlumaSeal work to fix the metalic parts of
your radiator? (it safely works with all parts (plastic, rubber etc) but does not work to on these parts to fix leaks.)
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Would you believe me if I told you the main active ingredient
is actually ground oatmeal?
There is only enough aluminum flake in it to "color" the oat granules.
the stuff functions by absorbing water and expanding, hopefully while a granule is caught in the crack that was leaking....
AllanD
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