- Feature Paper
- Article
Characterization of Stainless Steel Spent Pickling Sludge and Prospects for Its Valorization
- Fernando Castro,
- Pedro B. Tavares,
- Nuno Cristelo,
- Tiago Teixeira,
- Joana F. Garcia and
- Nuno M. G. Parreira
Fluorspar is considered a critical raw material for the European Union, due to its industrial uses and lack of sufficient extraction in European countries. It is a source for hydrofluoric acid manufacture, this latter chemical being employed, among o...

