I am hoping you take the time to look at this video and maybe contact the recyclers in your town/city about it.
Here is a link that might be useful: United Nations University
It is very interesting. I have a feeling that it is not as simple as shown. There is no mention of the amount of energy used in the process. If this were efficient, I think many industries would jump at the opportunity. Any time an abundant by product can be used to make a product in great demand someone will do it. Al