Solubility of Litharge (a-PbO) in Alkaline Media at Elevated Temperatures.

Ziemniak, S. E. ; Palmer, D. A. ; Benezeth, P. ; Anovitz, L. M.

Technical Information Center Oak Ridge Tennessee

关键词: Lead oxides;    Solubility;    Aqueous solutions;    High temperature;    Morpholine;   

RP-ID  :  DE2005837669

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

An inert, flowing autoclave facility is used to investigate the solubility behavior of (alpha)-PbO (litharge, tetragonal) in aqueous solutions of morpholine, ammonia and sodium hydroxide between 38 and 260 C. Lead solubilities increased from about 0.4 mmol kg(sup -1) at 38 C to about 4.5 mmol kg(sup -1) at 260 C and were relatively insensitive to the concentration and identity of the pH-reagent. The measured lead solubilities were interpreted using a Pb(II) ion hydroxocomplexing model and thermodynamic functions for these equilibria were obtained from a least-squares analysis of the data. A consistent set of thermodynamic properties for the species Pb(OH)(sup +), Pb(OH)(sub 2)(aq) and Pb(OH)(sub 3)(sup -) is provided to permit accurate lead oxide solubility calculations over broad ranges of temperature and alkalinity.