Abstract
ABSTRACTUsing the method of isothermal saturation, the solubility of lead oxide in NaOH and NaOH–30%Na2CO3 melts was studied under an inert helium atmosphere in the temperature range 673–873 K. The temperature dependence of the lead oxide solubility ms (mole fractions) in the given melts is described by the equations: ln ms = 12.174–13,490 1/Т for the molten NaOH and ln ms = 15.536–16,680 1/Т for the molten NaOH–30%Na2CO3. The heterogeneous equilibrium between solid lead oxide and its saturated solution in the alkali and alkali-carbonate melts can occur according to the reaction: PbOs = Pb2+ + O2−. The model mechanism of dissolution is discussed. Thermodynamic parameters for the dissolution of lead oxide in the melts are calculated. The addition of sodium carbonate to the molten sodium hydroxide decreases the solubility of lead oxide in the melt. As the temperature of the melt rises, the lead oxide solubility in it increases.
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