中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 23 No. 4 April 2013 |
（1. Key Laboratory of Intensification Metallurgy in Yunnan Province, Kunming 650093, China;
2. Key Laboratory of Unconventional Metallurgy, Ministry of Education,
Kunming University of Science and Technology, Kunming 650093, China;
3. Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology, Kunming 650093, China）
Abstract:The thermal decomposition process of jarosite residue and the solubility of various oxides presented in the decomposed residue in NH4Cl-H2O system were studied. The results of heat decomposition of jarosite residue show that the insoluble ZnFe2O4 phase in the residue can be decomposed at temperatures ranging from 500 °C to 650 °C for 1 h. The OLI Systems software was used to study the thermodynamics of the solubility of various metal oxides existing in the decomposed residue in NH4Cl-H2O system. The results show that the solubility of ZnO, PbO, CdO, CuO and Ag2O is high, while the solubility of Fe2O3 is less than 10-4 mol/L in the pH range from 4.0 to 9.0. The calculated data are in accordance with the experimental results.
Key words: jarosite residue; zinc hydrometallurgy; thermodynamics; NH4Cl system
