|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||7th International Symposium on High Temperature Metallurgical Processing
||The Extraction of Zinc from Willemite by Calcified-roasting and Ammonia-leaching Process Based on Phase Reconstruction
||Wei Chen, Yufeng Guo, Feng Chen, Tao Jiang, Xudong Liu
|On-Site Speaker (Planned)
Willemite is typically found in metallurgical secondary resources, but without effective extraction method yet. Based on the ideas of zinc phase reconstruction in the willemite, the extraction of zinc from willemite by calcified-roasting using CaO as the additive and ammonia-leaching process is inverstigated in this paper. The influences of additive dosage, roasting temperature, roasting time on the phase transformation and zinc leaching rate were studied, which were characterized by XRD. The results indicated that Zn2SiO4 was completely transformed into ZnO or Zn2CaSi2O7.After roasted with 1.4 times of theoretical dosage of CaO at l280℃ for 40 minutes,willemite was thoroughly transformed into ZnO. The zinc leaching rate of roasted sample was 97.45% in NH4Cl-NH3ĚH2O leaching system, which increased by 91.40 % compared with zinc leaching rate of 6.05% when willemite was directly leached in NH4Cl-NH3ĚH2O system.
||Planned: A print-only volume