Electrode Potentials of Platinum in a Mixture of Potassium and Lead Chlorides

The equilibrium potentials of platinum in a KCl–PbCl₂—PtCl₂ melt at various temperatures and platinum dichloride contents are measured by the emf method. The empirical equations of the isotherms and polytherms of the equilibrium potentials of platinum are derived. The conditional standard potentials of platinum in a molten mixture of potassium and lead are calculated. The changes in the Gibbs energy upon platinum dichloride formation from elements in the melt under study are determined. The separation factors of the metals from the alloys are estimated. The obtained results indicate prospects of the separation processes of lead and noble metals in chloride melts.