Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The analytical framework for integrated circular economy of critical material management. The framework includes four life-cycle stages from material to end-of-life stage, and in-use stage is specified with four hierarchical layers in which different strategies can be applied. The implementation of two critical sets of circular economy, manufacturing and end-of-life stage, is highlighted [32].
