Aalto University, School of Chemical Engineering, Department of Chemical and Metallurgical Engineering, PO Box 16100, FI-00076 Aalto, Finland.
School of Metallurgy, Northeastern University, Shenyang 110819, China; Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China.
J Hazard Mater. 2021 Jul 15;414:125541. doi: 10.1016/j.jhazmat.2021.125541. Epub 2021 Feb 26.
A potential industrial waste-waste co-treatment process was proposed and verified for the recovery of the valuable metals Co, Ni, and Cu from copper smelting slag by utilizing high temperature SO off-gas. Sulfation roasting followed by water leaching under designed thermodynamic conditions was conducted to facilitate the selective formation of Co, Ni, and Cu sulfates while separating iron as oxide. Several parameters were studied such as roasting temperature, roasting time, the addition of NaSO, and leaching agent. Under the optimized sulfation roasting conditions (Gas flow: 500 mL/min, 5% SO +20% O +75% Ar; Roasting temperature: 650 °C; Roasting time: 4 h; Addition of NaSO: 30%) followed by water leaching (Leaching temperature: 80 °C; Leaching time: 5 h; solid to liquid ratio: 0.05 g/mL), the extraction yields of Ni, Co, and Cu were shown to reach 95.8% and 91.8%, 81.6%, respectively. Furthermore, the sulfation roasting - water leaching process was confirmed on lab-scale as a feasible and efficient way to recover valuable metals and the mechanism was determined and verified from the microstructural evolution. Finally, a potential environmentally friendly industrial process in terms of the energy flow and material flow was presented based on preliminary assessments for environmental benefits, economic benefits, and heat recovery.
提出并验证了一种潜在的工业废渣共处理工艺，以利用高温 SO 废气从铜冶炼渣中回收有价金属 Co、Ni 和 Cu。在设计的热力学条件下进行硫酸盐焙烧和水浸，以促进 Co、Ni 和 Cu 硫酸盐的选择性形成，同时将铁分离为氧化物。研究了几个参数，如焙烧温度、焙烧时间、NaSO 的添加和浸出剂。在优化的硫酸盐焙烧条件下（气体流量：500mL/min，5% SO+20% O+75% Ar；焙烧温度：650°C；焙烧时间：4h；NaSO 添加量：30%），然后进行水浸（浸出温度：80°C；浸出时间：5h；固液比：0.05g/mL），Ni、Co 和 Cu 的浸出率分别达到 95.8%、91.8%和 81.6%。此外，硫酸盐焙烧-水浸工艺已在实验室规模上得到验证，是一种从有价金属中回收有价金属的可行且有效的方法，并从微观结构演化的角度确定和验证了其机制。最后，根据初步的环境效益、经济效益和热回收评估，提出了一种潜在的、在能源和物质流动方面具有环保意义的工业工艺。
