Kinetics of Barium Sulfate Cristallisation at the Process its Spontaneous Precipitation in an Aqueous Solution

摘要

The formation of barium sulfate scale in oil wells and in several industrial processes, in which water supersaturated with respect to this salt is used, is often a serious cause of energy losses. The spontaneous precipitation in aqueous solutions containing relatively high barium and sulfate concentrations was investigated in the present work. In our experiments the supersaturation of the solutions was chosen so that an induction period preceded the onset of precipitation. In all cases the induction time was inversely proportional to the supersaturation of the solution, and the deposition rate was higher the higher the supersaturation of the solution. The induction time depends linearly on the initial concentration of barium and does not depend on the molar ratio of barium to sulfate. Depending on the induction time of the barium ion content was determined by the size of the critical nucleus.