|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||PbZn 2020: The 9th International Symposium on Lead and Zinc Processing
||Smelting Jarosite and Sulphur Residue in a Plasma Furnace
||Justin Salminen, Jens Nyberg, Matej Imris, Bror Magnus Heegaard
|On-Site Speaker (Planned)
Iron and sulphur residues are formed during electrolytic recovery of zinc at Boliden Kokkola. Several options have been studied to treat this material in order to minimize waste generation. The goal was also to recover more metals, obtain stable clean slag for use and SO2 gas for sulphuric acid production.
The plasma Arcfume furnace was used for directly smelting combined residue i.e. jarosite plus sulphur residue from Boliden Kokkola zinc plant. The tests were carried out in two stages, including a smelting stage and a reduction stage. The obtained slag composition was 1-2 wt-% of Zn and 0.3 wt-% of Pb after smelting stage and after short reducing stage Zn<1 wt-% and Pb<0.03 wt-% were reached. In the smelting stage no additional coal was used. In the reducing stage however some coal was added. Overall, the direct CO2-emissions were lower than expected.