What are the methods of cyanide gold extraction?

Cyanide gold extraction is a common method used to extract precious metals such as gold and silver. Here are some commonly used methods of cyanide gold extraction for heavy equipment and machinery:

1. Cyanide leaching method: 

Soak the gold-bearing ore or waste material in a solution of sodium cyanide, which causes the precious metals like gold and silver to be cyanide-ionized, and then adsorb them on activated carbon. The metal can be obtained by electrolysis or chemical precipitation.

2. Cyanide electrolysis method: 

Dissolve the gold-bearing ore or waste material in a sodium cyanide solution and then pass the solution through an electrolytic cell to deposit the metal on the electrode.

3. Cyanide precipitation method: 

Dissolve the gold-bearing ore or waste material in a sodium cyanide solution and add a precipitating agent such as sodium hydroxide to separate the metal in the form of a precipitate.

4. Cyanide staining method: 

Soak the gold-bearing ore or waste material in a solution containing a cyanide compound, then add a reducing agent to separate the metal in a reduced form.

It should be noted that the cyanide gold extraction methods have significant environmental risks and safety hazards. Therefore, strict control of operating conditions and waste liquid treatment is necessary.