Maria Letizia Ruello is a Senior Researcher in Material Science and Technology and Research Manager for the Università Politecnica delle Marche project “Sustainable valorization of by-products of the Critical Raw Materials recycling”. Since 2013, she has been the coordinator for the Università Politecnica delle Marche of the inter-departmental task force on Critical Raw Materials and contact person for the European Innovation Partnership EIP on Raw Material SUBST-EXTREME (Technology Pillar; Priority Area: Substitution of raw materials; Action area n° I.8: Materials under extreme conditions (1) Substitution of CRM in heat-resistant super alloys, (2) Substitution of CRM in hard materials).