Influence of the concentration of tiocarbamide, copper ions on tiocarbamide alkali extraction of gold and silver

The influence of tiocarbamide concentration, length of the process and copper admixture on the velocity of gold and silver dissolution was studied. The influence of ions, depending mainly on their content in ore was stated. Small quantities (0, (0,16-0,48 mM) 16-0,48 mM) of Cu 2+ions, being brought into the solution, accelerate velocity of Au and Ag dissolution at 0,08-6,0 times, and increase of copper concentration influences their dissolution substantially.