1. Free cyanide analysis by silver nitrate titration with sulfide ion as interference
- Author
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Omero Alonso-González, F. Nava-Alonso, Juan Antonio González-Anaya, Fransico Alvarado-Hernández, and César Jiménez-Velasco
- Subjects
chemistry.chemical_classification ,Sulfide ,Gold cyanidation ,Mechanical Engineering ,Cyanide ,Silver sulfide ,Potentiometric titration ,Inorganic chemistry ,02 engineering and technology ,General Chemistry ,Geotechnical Engineering and Engineering Geology ,020501 mining & metallurgy ,Silver nitrate ,chemistry.chemical_compound ,0205 materials engineering ,chemistry ,Control and Systems Engineering ,Redox titration ,Titration - Abstract
In cyanidation process, the free cyanide concentration is the main variable that controls the efficiency of the process, and the plant operators determine it by silver nitrate titration. If sulfide ion is present in the solution the free cyanide concentration cannot be determined by titration as the silver added in the titration reacts with the sulfide ion to form a black solid (silver sulfide) that hinders the visual detection of the titration endpoint. This work proposes the potentiometric detection of the endpoint of the titration and demonstrates, thermodynamically and with analyses performed in synthetic solutions, that it is possible to determine both, sulfide and cyanide in the solution, even if the endpoint of the titration cannot be visually detected.
- Published
- 2017
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