Abstract
The precipitation of lead oxides from solutions of lead nitrate in molten alkali nitrates and in the absence of air is investigated. Lead oxides are never produced in lithium nitrate while these compounds spontaneously settle in molten potassium nitrate. In the case of sodium nitrate, the precipitation needs the addition of alkaline oxides.The nature of the solid product is temperature dependent. The precipitation of PbO or of the basic salt 5 PbO . Pb (NO3 )2 takes place below 325 °C while Pb3 O4 is formed at higher temperatures. This latter compound seems to be replaced by PbO2 beyond 475°C. In the case of mixtures of nitrates and nitrites (25 M %), the production of PbO only is observed independently on the temperature of the melt.These phenomena are explained by differences in the acidic properties of the cations of the investigated melts and by the temperature dependence of the oxidizing power of molten nitrates.
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