Alireza Javadi
Abstract
Pyrite (FeS2), chalcopyrite (CuFeS2), sphalerite (ZnS) and galena (PbS) generate hydrogen peroxide (H2O2) when placed in water, that pyrite the most amount of H2O2. The order of these minerals for generate of H2O2 in presence water is pyrite > chalcopyrite > sphalerite > galena. In the previous research, the methods of generation of H2O2 in the grinding mill have been studied but its effect on the oxidation of pulp components and hence in deteriorating the concentrate grade and recovery in flotation has not been explored yet. In this study, some parameters investigated to control the deleterious effects of H2O2 in flotation. The data from experimental have been attached by using MODDE 9 software for 6 parameters consist of composition of water, grinding media, particle size, pH, adding collector among the grinding, adding depressant. Finally, the optimize condition has been achieved: particle size 75 μ, process water, adding all collector, without depressant and pH 10. These changes in flotation response of sulphides have been discussed and explained with the formation of H2O2 quantitatively and the results are presented and discussed in terms of H2O2 generation vis-à-vis concentrate grade and recovery in flotation.
Keywords
Sulfide mineral, Hydrogen peroxide, Flotation, Oxidation
