Abstract
A double oxide containing Pt and Li, Li2PtO3, was prepared to search for an environment-friendly route to dissolve Pt in hydrochloric acid (HCl). Li2PtO3 powder was obtained by calcination of a mixture of Pt black and Li2CO3 powder at 600, 700 and 800°C. The resulting Li2PtO3 powder was soluble in HCl which has no oxidizing power at ambient temperatures. The Pt solubility of Li2PtO3 obtained at 600°C increased from 39.2 to 99.9% as the temperature of 12 M HCl increased from 40 to 80°C. From ultraviolet–visible absorption spectra, it was found that, a complex ion [PtCl6]2− formed as a result of a reaction of Li2PtO3 with HCl. The dissolution process by way of this compound is expected to benefit the establishment of environment-friendly recovery process of Pt.
