Method of converting copper cyanide to copper oxide and system thereof

A method for converting copper cyanide to copper oxide, comprising the steps of:

• contacting a copper cyanide solution with an acidic solution in a precipitation tank under reaction conditions sufficient to produce a copper cyanide slurry;
• removing the copper cyanide slurry from the precipitation tank;
• optionally, removing a gaseous effluent created in the precipitation tank;
• separating solid copper cyanide from the copper cyanide slurry in a first separation device;
• removing the solid copper cyanide from the first separation device;
• optionally, removing a liquid effluent created in the first separation device;
• contacting the solid copper cyanide with a sodium hydroxide solution in a production tank under reaction conditions sufficient to produce a copper oxide slurry;
• removing the copper oxide slurry from the production tank;
• separating solid copper oxide from the copper oxide slurry in a second separation device;
• optionally, removing the solid copper oxide from the second separation device;
• and
• optionally, removing from the second separation device any residual sodium hydroxide not reacted during the process of contacting the solid copper cyanide with the sodium hydroxide solution in the production tank.