Abstract:The system n-dodecanoic acid/mercury in 0,1 N KCI solutions has been investigated within pH range 4,0-10,5 in order to characterize the adsorption of surfactant and to determine its influence on the flotation of mercury. Flotation tests have been carried out in a model mercury flotation apparatus developed by Pomianowski and Para. Some characteristic parameters of adsorption (attraction constant of Frumkin isotherm, adsorption coefficient at maximum adsorption potential, free standard adsorption enthalpy and area per molecule) have been determined by a. c. polarographic capacity-potential and capacity-time curves. Flotation recovery as well as attraction constant, adsorption coefficient and surface excess reach maximum at pH ~ 5,1. It is explained by the assumption of an ion-molecule associate formation.
The temperature dependence of the equilibrium constant of the formation of ammonium sulphite from SO2, NH3, and H2O given by theoretical equation derived by Wolfkowitsch and Zirlin has been confirmed by calculations based on the accessible experimental data. Substitution of SO2 by CO2 in solid ammonium sulphite can take place when partial pressure of CO2 exceeds at least 104 times that of SO2.
Im Zusammenhang mit Verfahren zur SO,‐Entfernung aus Abgasen durch NH3‐Zusatz werden Kinetik und Mechanismus der im System S02′H20′NH3 verlaufenden Reaktionen untersucht.
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