Leaching Behavior of Tin from pure Sn and Sn-Fe couple by NaOH Solutions

摘要

The leaching behavior of tin from pure Sn and Sn-Fe couple in caustic solutions has been investigated using a rotating disc. Oxygen was used as an oxidant. The effect of concentration of NaOH, rotation speed, temperature and oxygen potential has been studied. The leaching rate of tin form Sn-Fe couple was reduced than that from pure tin at relatively low oxygen potentials due to galvanic effect. On the other hand, when the oxygen potential was high, the galvanic effect of the leaching rate became less pronounced. The rates of leaching of tin form pure Sn and Sn-Fe couple in oxygenated caustic solution were controlled by mass transfer of oxygen through liquid-solid boundary layer.