The complexation of copper (II) ions with a mixture of oxyhydryl and sulfhydryl flotation agents in aqueous solutions
This article presents the results of studies of the complexation of copper (II) ions with a mixture of oxyhydryl and sulfhydryl flotation agents in aqueous solutions with the formation of poorly soluble compounds. The dissociation constants of flotation agents were determined by the conductometric titration method. It is assumed that associates are formed among themselves as a result of the interaction of flotation agents. Analysis of the data of pKa of associates shows that for different associates, one of the components will have proton-donor and the other will have proton-acceptor properties. It is shown that oleic acid is strong ( pK<sub>a</sub> 4.86), and diisooctyl-dithiophosphoric acid is weak in the associate of sodium diisooctyl dithiophosphate-sodium oleate, and the dissociation constant of this associate will be determined by the amount of sodium oleate. As a result of the interaction of copper (II) ions with a mixture of oxyhydryl and sulfhydryl flotation agents, poorly soluble compounds are formed, K<sub>sp</sub> ranges from 23 to 34. Based on the studies, it has been shown that associates of sulfur- and oxygen-containing surfactants form with copper (II) ions the poorly soluble mixed-ligand complex compounds, and the degree of binding of copper (II) ions to the poorly soluble compounds is 99.99 %.