鼓泡油膜萃取法处理氰化提金废水的新工艺

介绍一种鼓泡油膜萃取法处理氰化提金废水的新方法。结果表明:鼓泡油膜萃取法不仅可回收废水中高浓度的铜,还可经济回收极低浓度的金。废水中铜的脱除率达99%,金的萃取率达99%,氰根脱除率达91.9%。萃余液可返回选矿工艺重复利用,实现含氰废水的零排放。负载有机相经酸性硫脲反萃后可循环使用。采用锌粉置换法回收硫脲反萃余液中的金和铜。锌粉置换渣采用稀酸溶解法可实现金和铜的分离。金的总回收率达98.06%,铜的总回收率达94.74%。锌粉置换后液可制备硫化锌产品,锌回收率达96%。该工艺成本低,绿色环保,具有潜在的应用推广前景。     

A new high-velocity oxygen fuel process for making finely structured and highly bonded inconel alloy layers from liquid feedstock

High-velocity oxygen fuel (HVOF) thermal spray processes are used in applications requiring the highest density and adhesion strength, which are not achievable in most other thermal spray processes. Similar to other thermal spray processes, however, a normal HVOF process is unable to apply fine powders less than 10 μm via a powder feeder. The advantages of using smaller and even nanosized particles in a HVOF process include uniform microstructure, higher cohesion and adhesion, full density, lower internal stress, and higher deposition efficiency. In this work, a new process has been developed for HVOF forming of fine-grained Inconel 625 alloy layers using a liquid feedstock containing small alloy particles. Process investigations have shown the benefits of making single and duplex layered coatings with full density and high bond strength, which are attributed to the very high kinetic energy of particles striking on the substrates and the better melting of the small particles. This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials Park, OH, 2006.