Anode sludge
Anode sludge is a valuable waste product in metal production, especially in the production of copper and silver .
It arises from the electrolytic refining of the raw products of these metals. During refining, the raw product is always connected as the anode and a piece of pure metal as the cathode . During electrolysis, the metal to be processed and all less noble components go into solution. All the nobler components remain solid and fall under the electrode. There they form what is known as the anode sludge. It usually contains many precious metals such as gold and platinum . Anode sludge is therefore an important preliminary stage for the extraction of precious metals.
literature
- Horst Briehl: Chemistry of Materials, Springer, Wiesbaden 2014, pp. 66–67. ISBN 978-3-658-06225-5
Individual evidence
- ↑ Cyanide leaching and electrochemical cleaning for silver and gold extraction. (accessed on August 22, 2019)
- ↑ Ann-Kathrin Pophanken: Behavior of accompanying elements in the refining electrolysis. In: The Metallurgists. Institute for Scientific Publications (Ed.), Project No. 76-046, ISSN 1614-8185 .
Web links
- Gold mining and cyanide leaching (accessed August 22, 2019)
- The copper story (accessed on August 22, 2019)
- Procedure for processing anode sludge (accessed August 22, 2019)
- Recovery of special metals from production waste for the electrical industry (accessed on August 22, 2019)