Add time:08/04/2019         Source:sciencedirect.com

The use of potassium persulfate as oxidant in gold cyanidation is proposed at pH values between 10 and 11. The addition of thallium (I) ions enables high cyanidation rates to be maintained at pH values higher than 11, as it acts as a catalyst of the process. When gold cyanidation is performed in the simultaneous presence of 10 mM persulfate and 0.5 mM thallium (I) the dissolution rate is eight times higher than that obtained by conventional cyanidation, and the working pH can achieve values near 13. The kinetics of the process have been studied, and the results compared with those obtained by conventional cyanidation. The process is shown to be diffusion-controlled with an activation energy of 19.2 kJ mol−1. Finally, an equation of the reaction rate that describes the kinetics of the overall process for gold cyanidation with potassium persulfate and thallium (I) is presented, and the [CN−]/[S2O82−] ratio at which the dissolution rate reaches its limiting value is shown to be 2.5.

We also recommend Trading Suppliers and Manufacturers of Thallium(I) cyanide. (cas 13453-34-4). Pls Click Website Link as below: cas 13453-34-4 suppliers