The characteristics of gold open circuit potential in ferric chloride leaching

S. Seisko, J. Aromaa, M. Lundström*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

Abstrakti

Gold dissolution was investigated in ferric chloride media, promoted as one of the most promising alternatives for cyanide-free gold leaching. The characteristics of gold open circuit potential (OCP) and its relation to gold dissolution rate was investigated. Furthermore, the reaction mechanism of gold dissolution in ferric chloride leaching was discussed. The effect of solution variables, [Fe3+] = 0.02-1.0 M, [Cl-] = 2-5 M, T = 25-95 °C and pH = 0-1.0, on OCP and dissolution rate were studied electrochemically using rotating disk electrode (RDE) and linear polarization resistance (LPR) method with ωcyc = 1000 RPM. The investigated gold OCPs in ferric chloride solutions were found to vary between 597 and 688 mV vs. saturated calomel electrode (SCE) and gold dissolution rates between 1.2·10-5-5.0·10-4 mol s-1 m-2. Increase in temperature (25-55 °C) and ferric concentration (0.02-1.0 M) changed OCP into more positive values, while increase in chloride concentration (2-5 M) decreased it. The logarithm of gold dissolution rate was shown to increase linearly with increasing OCP at the temperature range 25-95 °C, ferric concentration range 0.02-0.5 M and chloride concentration range 2-4 M. A notable increase in the gold dissolution reaction rate was evident at T > 55 °C.

AlkuperäiskieliEnglanti
OtsikkoIMPC 2018 - 29th International Mineral Processing Congress
KustantajaCanadian Institute of Mining, Metallurgy and Petroleum
Sivut2723-2730
Sivumäärä8
ISBN (elektroninen)9787030227119
ISBN (painettu)9781510874992
TilaJulkaistu - 1 tammikuuta 2019
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaInternational Mineral Processing Congress - Moscow, Venäjä
Kesto: 17 syyskuuta 201821 syyskuuta 2018
Konferenssinumero: 29

Conference

ConferenceInternational Mineral Processing Congress
LyhennettäIMPC
MaaVenäjä
KaupunkiMoscow
Ajanjakso17/09/201821/09/2018

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