Hayduk, Walter,Li, Hanning.2009-03-232009-03-2319941994Source: Masters Abstracts International, Volume: 35-05, page: 1456.9780612156418http://hdl.handle.net/10393/6463http://dx.doi.org/10.20381/ruor-14850The solubilities of oxygen in aqueous solutions, containing sulphuric acid and copper or nickel sulphate, play an important role in a hydrometallurgical process for the recovery of copper called "pressure leaching". The experimental solutions were prepared as aqueous solutions containing 150 or 200 g/l of sulphuric acid and/or cupric cations of 30 g/l or 45 g/l and 0 or 15 g/l of nickel ions. The solubilities of oxygen in aqueous acid-salt solutions were determined at atmospheric and high pressures. The solubilities were measured in an absorption column. At an oxygen partial pressure of 0.5 MPa, the solubilities were measured by means of a two-step method. The solutions were saturated with oxygen at the temperatures of 373.15 K and 413.15 K at the oxygen partial pressure of 0.5 MPa. The oxygen was then desorbed at atmospheric pressure and 313.15 K. Densities and vapour pressures of solutions were also measured at temperatures from 298.15 K to 413.15 K for the determination of oxygen solubilities. The logarithm of oxygen solubilities in aqueous acid-salt solution is linearly related to molar concentration of bivalent cations and densities of acid-salt solutions. A simple model is then suggested to predict oxygen solubilities in the acid-salt solutions. This model has some advantages, compared with the models proposed by Setschenow and by Krevelen and Hoftijser. The effects of temperature and pressure on oxygen solubility are also discussed. In the solutions studied, the oxygen solubilities as a function of temperature follow a similar pattern to that in water. For different pressures, Henry's law is obeyed in the range of this research ($\le$5 atm). (Abstract shortened by UMI.)116 p.Engineering, Chemical.Thesis