Role of Elemental Sulphur in Stage B Self-Heating of Sulphide Minerals, and the Potential Role of Polysulphides

Sulphide minerals undergo numerous stages of mineral processing to extract the desired metal. When they are exposed certain environmental conditions, some sulphide can spontaneously heat up, a process called self-heating (SH), which, if left unchecked, be major hazard. Self-heating occurs in three distinct temperature stages, termed Stage A (temperature below 100 °C), B range °C–350 and C (above 350 °C). Historically, it was understood that elemental sulphur generated fuels reactions; however, full extent this behaviour is still unknown. The aim study understand role reactions. results have demonstrated incapable fueling on its own, needs interact with ambient temperatures presence moisture air. This interaction seems unique pyrrhotite, as failed demonstrate stage other minerals. Previous works surface chemistry suggest leads formation polysulphides.