Both gold and silver can be combined with hydrazine to form a compound more or less. The gold telluride is brittle and easy to float (the foaming agent can float), and the gold in the gold-bismuth ore is mostly fine-grained telluride. Therefore, there are two options for dealing with such ores:
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1. Insoluble gold is selected into the concentrate by flotation, oxidative roasting, calcination and flotation of tailings are carried out on the gold-bismuth concentrate. However, during roasting, the temperature should be gradually increased to prevent the gold telluride from melting and absorbing the gold of its connate, and prolonging the cyanide time; at the same time, it is necessary to prevent some gold from being lost with the soot during roasting.
2. The cyanide is directly cyanated, the cyanide tailings are floated, the flocculation is calcined, and the calcination is followed by cyanidation. Because gold tellurides than sparingly soluble cyanide free gold, with its solubility and improve the oxygen-containing alkaline solution concentration is increased, while the sodium peroxide decomposable tellurides, finely ground material capable of cyanogen bromide (to -200 mesh 99%), prolong the leaching time (50-60 hours), apply high-yield solution (CaO concentration greater than 0.02%), strongly inflate the slurry or add oxidant (Na 2 O 2 dosage 1
200-500 g/ton) and cyanogen bromide (used as sodium cyanide), etc. 3
Measures.