|About this Abstract
||Part C-1: Hydrometallurgy 2018
||Hydrometallurgical Recovery of Lead from Zinc Calcine Neutral Leach Residue
||Andrzej Chmielarz, Ryszard Kurowski, Agnieszka Fijałkowska
|On-Site Speaker (Planned)
Neutral leaching of zinc calcine generates sludge containing lead (10-15%)as sulphate, and zinc (15–20%), bound into sulphides and ferrites. The material is usually subjected to HAL, or to Waelz process. The product of the last is crude ZnO of significant lead content (15–20%), thus limiting its further treatment for IS Process. Selective lead recovery from the sludge can be reached thanks to solvation properties of triethylenetetramine (TETA). That compound extracts a whole molecule of PbSO4 into aqueous phase. After phase separation lead recovery as carbonate is carried out through CO2 action. TETA based technology was verified in the process of lead recovery from neutral leach residue. The results show potential for recovery of over 80% of lead in a form of PbCO3 (≈70% Pb), with about 30% reduction of sulphates and 20% loss of mass of the leached material. The leaching residue contains 2% of lead only.
||Planned: At-meeting proceedings