Adsorption from aqueous solutions of ionic surface-active agents by gold. Part 2

Abstract

The extent of adsorption by gold from aqueous solutions of a series of long-chain ammonium bromides has been measured and electrokinetic properties of gold in these solutions studied by microelectrophoresis. Froth flotation of gold particles has been studied in solutions of long-chain ammonium bromides, of long-chain pyridinium bromides and of the anionic compounds sodium cetyl sulphate and sodium dodecyl sulphate. In part 1, conclusions were drawn from adsorption and electrophoretic data regarding the modes of orientation of surfactant ions in the adsorbed layers; specific adsorption of surfactant anions but not of cations was postulated. The relative efficiencies of flotation reported here support those conclusions.