Arsenic Removal from Pyrite Cinders by Oxidizing Roasting with Sodium Hydroxide Addition

A craft of sodium hydroxide roasting-aqueous leaching process is investigated for the treatment of a high arsenic pyrite cinders, a common by-product in vitriol industry. The pyrite cinders, containing 58.27% Fe, and 0.98% As, was conducted for the craft. The results demonstrated that iron concentrate with 58.87% Fe, 0.13% As and 87.40% of arsenic removal percentage was obtained under the optimal conditions (a roasting temperature of 1000°C, a roasting duration of 120 min and a mass ratio of sodium hydroxide to pyrite cinders of 8%).This craft can be used to utilize pyrite cinders and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of pyrite cinders and extend raw material sourcing for Chinese steel industry.