Collecting iron powder on the beach
A method for iron extraction for beach inhabitants
Online since: 25/07/2008, Number of visits: 219912
I am a physics and math teacher at a secondary school. I bought a few of your disc magnets 15 x 8 mm for demonstrations about magnetism in the school lab. The students liked that very much.
This summer I tried to collect pure iron to have a stockpile of iron powder for physics experiments in the next school year.
Collecting iron powder on the beachCollecting iron is actually very easy: The beach of Ostia near Rome has very dark sand due to its high iron content (pure iron powder is black).
I put the magnets into a plastic bag and moved the bag back and forth directly above the sand. The iron deposited itself right away on the outside of the bag in the form of black powder.
After a few trials, I made a video with the necessary explanations as well as hints for application possibilities. Especially exciting: It is actually possible to detect the shape of the magnetic field when approaching the sand with the magnets.
This experiment is suitable for primary and secondary schools, if you combine the demonstration with an in-depth theory about the magnetic field.
Sculpture made of iron powder and magnetsArtist Giovanni Casu also collected a large amount of iron powder (on the beach of Sardinia) with the help of magnets.
He made sculptures from the powder and large ferrite magnets and presented them in several exhibitions. The making of these sculptures can be seen in the following video.
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