Sand sinks and coffee grounds float.
I'd start there.
I'm not sure what form the coffee is in, however unroasted raw beans might not float, and if it is instant coffee then you would probably ruin the product.
As salt is soluble in water, mixing salt and sand in water would result in solid sand, and salt water. When poured through a coffee filter, the sand would remain in the filter, while the salt water would flow through. After letting the water evaporate, salt would remain. You will be left with the two separated solids.
get a strainer to get the sand out silly :)
With a sieve.
Weigh each sample and then make a solution of coffee, sand and water. First of all, we have to filter the solution with the help of filter paper so all the water will pass through the paper and as a filtrate we will have coffee and sand. Take the filtrate and let it dry. Secondly, once the filtrate is dry take a strong magnet and scan across, underneath the filter paper. This will separate all the sand on one side of the filter paper. Finally, record the mass of each component after the experiment.
You should use a magnet to separate iron from sand. Iron is magnetic, so it will be attracted to the magnet and easily separated from the sand. A strainer would not work in this case as it would not be able to separate the two based on their magnetic properties.
You can separate them by filtration and it would help because when you add water the sand would stay because you would have to add cold water so that the sand will stay and the salt will go through.
it would be like thou sand
Iron can be separated from sand using a (electro)magnet.
Sublimation
Add water, It separate woodchip(float) and sand(down)
In solution, the salt will be dissolved in the water, the sand and iron will settle to the bottom of the container. Separate out the water, evaporate the water and the salt will remain, separate the sand and iron filings with a magnet.
A simple filter would be suitable for separating sand and water. An alternative would be to evaporate the water, leaving the sand behind.