Production of Gold
Gold is leached from ore by a dilute aqueous solution of sodium cyanide. The overall reaction thought to be mostly responsible for this is . 6 2 Au + 4CN + O 2 + 2 H 2O → 2 Au CN 2 + 2OH + H 2 O 2 − ( )− − This reaction was modeled as a shrinking core in a spherical particle with large pores. The rate determining step is the mass transfer of reactants through a fluid film around the ...