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Meeting Extraction 2018
Symposium Part C-1: Hydrometallurgy 2018
Presentation Title New Process for Treatment of Cyanidation Effluent to Recover Cyanide and Metals
Author(s) Qiankun Wang
On-Site Speaker (Planned) Qiankun Wang
Abstract Scope Cyanidation has been practiced worldwide for extracting gold and silver from ores. A key issue for this process is how to treat the cyanide effluent/tails in an environmentally friendly and economically viable way. SPS-HYDROMET has developed a new process for treatment of cyanide effluent. In this process, cyanide effluent is subjected to chemical precipitation under alkaline conditions to concentrate cyanide and metals into a small amount of solids. The cyanide precipitate formed is further treated to regenerate cyanide which is recycled to cyanidation for reducing net cyanide consumption, and to recover metals as salable by-product. After the chemical precipitation treatment, cyanide in the effluent is reduced to ~ 1 mg/L, for further polish removal or discharge to a polish pond. An evaluation conducted indicates that this process is economically more viable as compared with existing cyanide destruction methods.
Proceedings Inclusion? Planned: At-meeting proceedings

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