Improving the recovery of precious metals from recalcitrant...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 11/08 (2006.01)

Patent

CA 2754117

The invention provides a novel process for improving the recovery of precious metals from recalcitrant refractory ores by the use of hydrofluoric acid dissolved in ionic liquids. The solution of hydrogen fluoride gas in an ionic liquid is contacted with dry crushed ore at a temperature and for a period of time commensurate with the fracturing of a specific recalcitrant refractory ore. The excess ionic liquid is separated from the ore and the fractured ore is further treated with dilute sodium cyanide solution to extract precious metals in greater yields.

La présente invention a pour objet un nouveau procédé permettant d'améliorer la récupération de métaux précieux à partir de minerais réfractaires récalcitrants grâce à l'utilisation d'acide fluorhydrique dissous dans des liquides ioniques. La solution de fluorure d'hydrogène gazeux dans un liquide ionique est mise en contact avec du minerai sec concassé à une température et pendant une période de temps proportionnelles à la fracturation d'un minerai réfractaire récalcitrant spécifique. Le liquide ionique en excès est séparé du minerai et le minerai fracturé est en outre traité avec une solution de cyanure de sodium diluée pour extraire les métaux précieux avec des rendements plus importants.

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