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CYANIDE PROCESS [1 record]

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Record 1 1999-05-11

English

Subject field(s)
  • Mineral Processing (Metallurgy)
  • Processing of Mineral Products
DEF

The extraction of gold and silver from their ores. The process is only applicable to these metals. The solvent is a weak solution of sodium or calcium cyanide which, when aerated, easily dissolves the precious metals. They are then recovered by agitating the "pregnant" solution with aluminium or zinc in the form of dust or shavings and filtering out the precipitate which is then melted and cast into bars (bullion).

French

Domaine(s)
  • Minéralurgie (Métallurgie)
  • Préparation des produits miniers
DEF

Traitement des minerais d'or et d'argent que l'on dissout dans des solutions très étendues de cyanures alcalins, en présence de l'oxygène de l'air, et dont on précipite ensuite les métaux précieux par le zinc ou par l'électrolyse.

CONT

Or associé à des sulfures de fer. [...] son extraction nécessite un processus [...] comportant en général une préconcentration et une calcination des concentrés, suivies de cyanuration.

CONT

L'essor industriel [...] du Witwatersrand commença [...] quand on employa la cyanuration pour recueillir le métal précieux.

Key term(s)
  • procédé de cyanuration

Spanish

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