just use a sifter
Simple. With a magnet. The iron dust will simply be attracted to the magnet. To collect the iron dust neatly, get a plastic sandwich bag or a small plastic baggie, put the magnet inside, use it to collect the iron dust, then turn the bag inside-out and remove the magnet.
they had to separate dust and rock crumbs
you can filter it
A magnet can be used to separate iron dust from sulfur since iron is magnetic while sulfur is not. By passing a magnet over the mixture, the iron dust will be attracted to the magnet, leaving the sulfur behind.
by filtering
Use a magnet.
Mix with water, the pass through a filter paper. The salt will be dissolved in the water so it will be removed with the water, leaving the iron filings and gold dust on the filter paper. Leave this to dry then separate off the iron filings using a magnet, leaving behind the gold.
I would use a fine meshed sieve.
One way to separate dust from a fluffy blanket is by using a lint roller or tape to pick up the dust particles. Another method is to shake the blanket vigorously outdoors to dislodge the dust, followed by brushing it with a soft brush to remove any remaining particles. Alternatively, you can also use a vacuum cleaner with a brush attachment to suck up the dust.
Iron is extracted with a magnet.
To separate gold dust from rock dust, you can use a method called panning. This involves adding water to the mixture and swirling it around in a pan. Gold, being denser than rock dust, will settle to the bottom of the pan while the lighter rock dust will wash away.
One common separation mechanism for dust in air is through gravity settling, where heavier dust particles settle to the ground due to their weight. Another mechanism is by using filters, such as air filters or electrostatic precipitators, to physically trap dust particles and prevent them from circulating in the air. Additionally, cyclone separators can be used to separate dust by centrifugal force, where particles are forced to the outer walls and collected in a separate chamber.