Cyanide is used to leach minerals with gold. Pleasure deposits do not require leaching.
Yes, by having a process of cyanidation of a mineral auriferous of vein. The cyanide salts must be the excess reagent
I'm worked on gold cyanidation already.
Yes. That is necesary to be free.
In the cyanidation of gold is very important free cyanide and this depends on the pH, at pH> 9.5 is stable free cyanide and as a rule I recommend working at pH between 10 and 10.5, it is not recommended pH over 10.5 because It forms calcium peroxide and this passive the process (decreasing the recovery of gold).
As for the time depends on the methodology and gold laws of more than 10 g / TM cyanidation is applied by agitation and the times are generally 96 hours of residence and no laws are less than 1 g / TM applies The cyanidation in heap and the times as a rule are 30 days. These times can be decreased if we vary the particle size, the agitation speed (the solution flow in the heap leaching), the concentration of cyanide etc.
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