Use of Ash-and-Slag Wastes after Burning of Fine-Dispersed Coal-Washing Wastes Vasilii Murko, Veniamin Khyamyalyainen and Marina Baranova E3S Web Conf., 41 (2018) 01042 Published online: 26 June 2018 DOI: 10.1051/e3sconf/20184101042