Dissolution rate of lead(II) oxide in an equimolar KCl-PbCl sub(2) melt

• Published in: Russian journal of non-ferrous metals Vol. 54; no. 3; pp. 195 - 200
• Main Authors: Pershin, P S, Kataev, A A, Shurov, NI, Arkhipov, P A, Zaikov, YuP
• Format: Journal Article
• Language: English
• Published: 01-05-2013
• Subjects: Constraining; Convection modes; Diffusion; Dissolution; Melts; Nonferrous metals; Oxides; Roughness
• ISSN: 1067-8212; 1934-970X
• DOI: 10.3103/S1067821213030139

Dissolution rates (W) of lead(II) oxide in a KCl-PbCl sub(2) equimolar melt are determined experimentally using the gravimetric method at T = 773, 823, and 873 K. It is shown that, as the temperature increases from 773 to 873 K, the initial magnitude of W increases from 23.9 to 45.6 mg/(cm super(2) min) with a conventional roughness coefficient of 10. Then the values of W for all temperatures are leveled, being close to zero after 25 min, which indicates the diffusion mode of the process in natural convection conditions. The activation energy of the interaction between PbO and the KCl-PbCl sub(2) melt was 37.370 plus or minus 0.118 kJ/mol. The limiting concentration of PbO in the equimolar KCl-PbCl sub(2) melt was determined, being 9.1, 10.6, and 13.5 wt % at T = 773, 823, and 873 K, respectively.