中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 34 No. 8 August 2024 |
（1. School of Metallurgy Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. School of Chemistry and Environmental Science, Xiangnan University, Chenzhou 423000, China;
3. Ganzhou Engineering Technology Research Centre of Green Metallurgy and Process Intensification, Ganzhou 341000, China;
4. Key Laboratory of Ionic Rare Earth Resources and Environment, Ministry of Natural Resources, Ganzhou 341000, China）
Abstract:The separation of halogens and recovery of heavy metals from secondary copper smelting (SCS) dust using a sulfating roasting-water leaching process were investigated. The thermodynamic analysis results confirm the feasibility of the phase transformation to metal sulfates and to gaseous HF and HCl. Under the sulfating roasting conditions of the roasting temperature of 250 °C and the sulfuric acid excess coefficient of 1.8, over 74 wt.% of F and 98 wt.% of Cl were volatilized into flue gas. Approximately 98.6 wt.% of Zn and 96.5 wt.% of Cu in the roasting product were dissolved into the leaching solution after the water leaching process, while the leaching efficiencies of Pb and Sn were only 0.12% and 0.22%, respectively. The mechanism studies indicate the pivotal effect of roasting temperature on the sulphation reactions from various metal species to metal sulfates and the salting out reactions from various metal halides to gaseous hydrogen halides.
Key words: secondary copper smelting dust; sulfating roasting; water leaching; halogen volatilization; heavy metal separation
