C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/04 (2006.01) C22B 11/00 (2006.01)
Patent
CA 2534737
The invention relates to an improvement to the silver and gold leaching method with thiourea solutions, which is intended for use in the mining and mineral- processing industry. More specifically, the invention relates to a solution composition which enables the use of thiourea. In particular, the invention relates to a method of forming a solution, which improves both (i) the speed of extracting silver and gold from minerals and other materials containing same, thereby improving the stability of the thiourea in the lixiviant solution, and (ii) the direct electrorecovery of the metals from said solution. The invention makes use of a leaching solution which is subjected to prior or simultaneous controlled electrooxidation in order to produce formamidine disulphide (FADS) which acts as an oxidising agent for the mineral phases containing gold and silver. In the preferred embodiment of the invention, the FADS forms in a proportion of between 10 and 30 % of the total thiourea contained in the solution and the electrodeposition of the metals is performed in the same cell (cathodic compartment) as that in which the FADS forms (anodic compartment).
L'invention se rapporte à l'industrie minière et au traitement de minéraux. Plus particulièrement, elle concerne une composition de dissolution qui permet l'utilisation de thiourée. Cette invention concerne également un procédé destiné à former cette dissolution qui améliore la vitesse d'extraction d'argent et d'or, à partir de minéraux ou d'autres matériaux qui les contiennent, améliorant ainsi la stabilité de la thiourée dans la dissolution lixiviante, telle que l'électro-récupération directe desdits métaux à partir de la dissolution mentionnée. Elle concerne également une dissolution de lixiviation soumise antérieurement ou simultanément à une électro-oxydation contrôlée en vue de produire du disulfure formamidine (DSFA) qui agit comme agent oxydant au cours des phases minérales qui contiennent l'or et l'argent. Dans son mode de réalisation préféré, le DSFA se trouve dans une proportion de 10 à 30 % de la thiourée totale contenue dans la dissolution et l'électrodéposition des métaux s'effectue dans la même cellule (compartiment cathodique) dans laquelle se forme le DSFA (compartiment anodique).
Giron Bautista Ita
Gonzalez Martinez Ignacio
Lapidus Lavine Gretchen Terri
Lopez Escutia Maria Concepcion
Oropeza Guzman Mercedes Teresita
Gowling Lafleur Henderson Llp
Universidad Autonoma Metropolitana
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