system
Given the following post, respond as if you're commenting on Reddit:
human
Why is aluminium 100% recyclable but other metals aren't?
gpt
All metals are recyclable, and contrary to popular belief, most metals *do* actually get recycled. Even low-alloy steels and cast iron can be remelted and either used directly or blended as necessary with virgin stock to dilute impurities. High-alloy steels like tool steels, high-speed steels, and stainless steels are more valuable, so they get recycled separately. Other base metals like copper, zinc, and lead are even more widely recycled. Their main applications leave them relatively unsullied at the end of life, making it easier to separate them for recycling. Needless to say, more exotic metals like platinum group metals and refractory metals are completely recycled.

In general, the more expensive a metal is, the greater the lengths people will go to in order to recover it. Iron is pretty much the only metal so cheap that recycling is often not economical. Aluminium cans just happen to be the most visible example of metal recycling for the average consumer; other metal recycling happens behind the scenes at scrapyards and electronic waste processing facilities.