Because of the amount of energy needed to create new aluminum, as well as the acidification problems associated with its production, recycling aluminum is far easier on the environment.
The recycling of brass can go on infinitely, without any loss of quality, making it a prime candidate for recycling and reuse.
Copper is completely recyclable when found in its raw state or from post-consumer products and it is the third most recycled metal after iron and aluminum.
Recycling a tonne of steel keeps 1.5 tonnes of iron ore in the mine and saves 40% of the water and 75% of the energy used to make virgin steel.