Recycling of Gold Tailings of Silicate-Carbonate Ores

The implementation of the method for extracting gold, including melting of silicate-carbonate technogenic material, showed that gold passes into a free state, and the size of its particles increases significantly. However, when the material melts, a significant amount of slag is formed, which must be disposed. The chemical composition of the slag was compared with the norms of approximate and maximum permissible concentration. The content of Cu, As, Sb, S, and Mn exceeds the established standards. When the melt is blown with air and natural gas, sulfur, arsenic, and antimony will pass into the gas phase. In this regard, the installation must be equipped with a dust and gas cleaning system. If 12 wt.% CaO is added to the initial mixture before melting, the slag will meet the requirements when it is used as a correcting additive in cement. © Published under licence by IOP Publishing Ltd.The research was supported by the Ministry of Science and Higher Education in accordance with the state assignment for Ural State Mining University No. 0833-2020-0008 “Development and environmental and economic substantiation of the technology for reclamation of land disturbed by the mining and metallurgical complex based on reclamation materials and fertilizers of a new type”. We obtain the scientific results using the equipment of the Centre for the collective use of scientific equipment of the Federal Scientific Centre of biological systems and agricultural technologies of RAS as well (No Ross RU.0001.21 PF59, the Unified Russian Register of Centres for Collective Use - http://www.ckp-rf.ru/ckp/77384)