Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China; State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China; State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Waste Manag. 2024 Apr 30;179:12-21. doi: 10.1016/j.wasman.2024.03.004. Epub 2024 Mar 5.
Sn ash recycling is an industry with positive development prospects, as it provides better-protected resources, promotes sustainable development, and lays a solid foundation for future development. In this study, an innovative vacuum carbothermal reduction-directional condensation process was developed. The thermodynamic analysis results indicated that the initial reaction pressure and temperature for the carbothermal reduction of the system was 1-10 Pa and 998-1063 K, respectively. The saturation vapor pressure, separation coefficient, and condensation temperature of Sn, Pb, and Zn in the reduced products differed significantly, and their separation could be achieved by controlling the volatilization and condensation temperatures. A single-factor experiment investigated the effects of carbon ratio, temperature, and time on the reduction efficiency, direct yield, and recovery rate. The optimal experimental conditions were the ratio of MeO to C of 4:1, temperature of 1373 K, and time of 120 min. Sn, Pb, and Zn products were obtained at different positions. This process shortens the traditional process, reduces the reduction cost of Sn, and enables the implementation of the process, making it environmentally friendly.
锡烟灰回收是一个具有积极发展前景的行业，因为它提供了更好的资源保护，促进了可持续发展，并为未来的发展奠定了坚实的基础。在本研究中，开发了一种创新的真空碳热还原定向冷凝工艺。热力学分析结果表明，该体系碳热还原的初始反应压力和温度分别为 1-10 Pa 和 998-1063 K。还原产物中 Sn、Pb 和 Zn 的饱和蒸气压、分离系数和冷凝温度差异显著，可以通过控制挥发和冷凝温度来实现分离。单因素实验研究了碳比、温度和时间对还原效率、直接收率和回收率的影响。最佳实验条件为 MeO 与 C 的比例为 4:1，温度为 1373 K，时间为 120 min。在不同位置获得了 Sn、Pb 和 Zn 产品。该工艺缩短了传统工艺，降低了 Sn 的还原成本，并实现了该工艺的环保实施。
