Cadmium extraction in the delaminating system diphenylguanidine – benzoic acid – water

Abstract

An delaminating system with diphenylguanidine and benzoic acid without an organic solvent was studied in order to evaluate its effectiveness in relation to the cadmium ions extraction. Extraction was studied in the presence of an inorganic (hydrochloric) acid or inorganic bases (sodium or ammonium hydroxide), as well as inorganic complexing agents (KI, NH4SCN). The optimal conditions for the cadmium extraction have been determined. It is shown that the most efficient cadmium extraction was observed when sodium hydroxide was introduced into the delaminating system. It has been established that with an increase in the concentrations of both diphenylguanidine and benzoic acid, the cadmium extraction increases. It was found that the quantitative extraction of cadmium was observed only in the presence of an inorganic complexing agent – potassium iodide.