Optimization of differential and cumulative flotation strategies for lead and silver recovery from mixed oxide-sulfide ores

Differential and cumulative flotation techniques were used to concentrate two representative samples, A and B, from the Khanjar lead-silver mine (Semnan Province, Iran). These samples had lead grades of ۰.۹۳% and ۰.۹۵% and silver contents of ۱۶.۸ and ۱۶ g/t, respectively. According to the analysis of the lead-containing minerals in the samples, only a small fraction of the total lead occurred as galena, with ۰.۷۳% as non-sulfide forms. According to the flotation test results, type A and type B ore behave differently during the flotation process, with type B ore exhibiting superior flotation performance. The lead recovery from ores type A and B was ۶۸.۴۱% and ۸۴.۶۱%, respectively, in the combined rougher and scavenger stages by adding ۵۰ g/t of collector Z۱۱ in the flotation stage of sulfide minerals and ۵۰۰ g/t of sodium sulfide as a surface activator in the flotation stage of non-sulfide minerals along with ۵۰ g/t of frother MIBC at pH ۸.۵. The grade and recovery of lead and silver increased in the experiments to improve the flotation efficiency of lead and silver from ores of type A by adding secondary collectors ۳۴۱۸A and M۴۶, but the sodium silicate dispersant had no discernible effect on the recovery. The appropriate flotation technique for mixed oxidized-sulfide lead and silver ores can be determined using the research's findings.

کلیدواژه ها:

Flotation ، Lead-Silver ، Mixed Oxide-Sulfide ، differential ، Cumulative