Pyrazole-Containing Polymer Sorbents for Recovery of Gold and Silver from Cyanic Solutions

摘要

The results of an investigation into imparting hydrophilic properties to pyrazole-containing sorbents in cyanic media and increasing their capacitive characteristics with respect to noble metals are presented. It is established that adding up to 30% (relative to 3(5)-methylpyrazole) of triethanolamine ortrime-thylamine into the resin matrix exerts a positive effect on the capacitive characteristics of sorbents based on styrene divinylbenzene and 3(5)-methylpyrazole. It is shown that the introduction of deprotonating additives into the reaction mixture when synthesizing a sorbent of SDP-d grade makes it possible to increase its sorption capacity by 20-25% in regards to silver for its recovery from the AgN03 solution (the number of functional groups of resin correspondingly increases). A sorbent of SDDP-d grade of microporous structure with an increased content of 3(5)-methylpyrazole groups is obtained. The synthesized samples of resins are compared in regards to sorption from cyanic solutions on the background of high Cu and Zn contents in starting solutions. The sorption isotherms of Au, Ag, Cu, and Zn on the SDDP-d resin from cyanic solutions are recorded, and the sorption ability series Au > Ag > Zn > Cu is determined.