Mechanical activation in utilising milling byproducts: a way to improve effectiveness Nataliya Lesnikova, Olga Chugunova, Valentina Lapina, Tatiana Kotova and Ekaterina Pastushkova E3S Web Conf., 296 (2021) 07012 Published online: 28 July 2021 DOI: 10.1051/e3sconf/202129607012