Quote Originally Posted by Guin
You are right. "вторичное сырьё (вторсырьё)" - "secondary raw materials" is something that you can recycle and use repeatedly. Thus, there is no in Russian such word "сырь", but there is the word "сырьё".
Перевод слова вторичное из выражения "вторичное сырье" будет не secondary but again used as raw material.