|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||PbZn 2020: The 9th International Symposium on Lead and Zinc Processing
||Phase Evolution during the Oxidation Process of Low Grade Lead-zinc Oxide Ore
||Hai-Peng Gou, Kuo-Chih Chou, Zhong-Ye Pei, Song-Xuan Chen, Xue-Gang Chen, Ming-Chuan Li
|On-Site Speaker (Planned)
The phase evolution during the oxidation process of low grade oxidized lead-zinc ores was investigated at 1173-1473K under air atmosphere. A thermogravimetric and differential thermal analysis was carried out to investigate the oxidation mechanism. The oxidation products were analyzed by X-ray diffraction. It was found that the sulfides in the ores were oxidized when the temperature was higher than 923K. The carbonates in the ores decomposed when the temperature was higher than 1173K. During the oxidation process from 1173K to 1273K, the main phases in the products were CaSO4, Fe3O4, MgFe2O4, ZnFe2O4, Zn2SiO4, ZnO and PbFe4O4. Along with the increase of reaction temperature and prolonging of reaction time, a new phase of Ca2Fe2O5 appeared in the products after the decomposition reaction of CaSO4 and Zn2SiO4. Based on the formation of Ca2Fe2O5, the sintering phenomenon of the ores occurred obviously at 1473K.