Cyanide and Copper Recovery from Barren Solution of the Merrill Crowe Process

José R. Parga*, Jesús L. Valenzuela, J. A. Díaz

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


This paper is a brief overview of the role of inducing the nucleated precipitation of copper and cyanide in a flashtube serpentine reactor, using sodium sulfide as the precipitate and sulfuric acid as pH control. The results showed that pH had a great effect on copper cyanide removal efficiency and the optimum pH was about 3 to 3.5. At this pH value copper cyanide removal efficiency could be achieved above 97 and 99 %, when influent copper concentration ions were 650 and 900 ppm respectively. In this process the cyanide associated with the copper, zinc, iron cyanide complexes are released as HCN gas under strong acidic conditions, allowing it to be recycled back to the cyanidation process as free cyanide.

Original languageEnglish
Title of host publicationREWAS 2013 Enabling Materials Resource Sustainability
Number of pages8
ISBN (Electronic)9781118679401
ISBN (Print)9781118605875
StatePublished - 25 Feb 2013

Bibliographical note

Publisher Copyright:
© 2013 The Minerals, Metals & Materials Society. All rights reserved.


  • Copper recovery
  • Cyanide recovery
  • Precipitation copper


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