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Aluminium Powder: Molten Aluminium Shot into Water, then Stamped
Aluminium powder is the fuel of the thermit reaction that turns metal oxides into metal. Thorpe (1912) gives how it was made: molten aluminium poured into water, and the small irregular fragments, once dry, pounded under stamp-mills until fine enough. Molten metal and water: face shield, gloves, and pour slowly. Keep the powder away from flame.
The picture: aluminium powder (Wikimedia Commons).
Intermediate
1 day
Instructions
1
1
Melt the aluminium
Melt the aluminium
Melt 200 g of aluminium in a crucible in the furnace.
Materials for this step:
Aluminium Ingot200 gTools needed:
Balance Scale
Crucible
Charcoal Furnace
Crucible Tongs
Face Shield
Leather Gloves2
2
Pour it into water
Pour it into water
Stand back behind the face shield and pour the metal slowly, in a thin stream, into a bucket of cold water. It sets as small irregular fragments.
Tools needed:
Water
Metal Bucket with LidCrucible TongsFace ShieldLeather Gloves3
3
Dry the fragments
Dry the fragments
Lift the fragments out with a skimmer and dry them completely.
Tools needed:
Perforated Skimmer4
4
Stamp to powder
Stamp to powder
Pound the dry fragments under the stamp mill until the powder is fine. Sieve, return the coarse part to the stamps, and keep the powder in a closed jar.
Tools needed:
Stamp Mill
Fine Sieve
Glass Jars with LidsMaterials
1- 200 gPlaceholder
Tools Required
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