Recycling of Gold Tailings of Silicate-Carbonate Ores

Abstract

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.