Recovery of Gold and Silver by Pressure Cyanidation Leaching and Electrocoagulation

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This paper describes a new technology of pressure oxidation/cyanidation leaching
for the dissolution of gold and silver and the recovery of the precious metals by using the
electrochemical process of Electrocoagulation (EC). The novel method demonstrates that the
oxidation and dissolution of gold and silver in alkaline cyanide solution can be conducted
simultaneously in the same reactor in less than 90 minutes with a recovery that exceeds 96%.
Then, the pregnant cyanide solution with gold and silver is sent for recovery of precious
metals by using a very promising electrochemical technique (EC) that does not require high
concentrations of silver and gold in cyanide solutions.

Gold is classed as a noble metal because of its inertness to most chemical reactions under
ordinary conditions. At the present time, cyanidation has superseded all previous leaching
processes, particularly chlorination, because of its ability to effectively and economically
treat ores containing as little as 1-3 g/ton gold. Cyanidation processes are especially suitable
for treatment of gold/silver-bearing sulphidic materials.
Translated title of the contributionRecuperación d eoro y Plata por Lixiviación Oxidación a Presión y Electrocoiagulación
Original languageAmerican English
Title of host publication2018 SME Annual Conference
Subtitle of host publicationInternational: Updates on Mining in Mexico
Place of PublicationMinneapolis, Minesota, EUA
PublisherSociety for Mining, Metallurgy and Exploration
StatePublished - 27 Feb 2018

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