Potential control flotation of galena in strong alkaline media

来源期刊：中南大学学报(英文版)2002年第1期

论文作者：顾帼华 胡岳华 邱冠周 王晖 王淀佐

文章页码：16 - 20

Key words：galena; potential control flotation; collector

Abstract: The electrochemical oxidation of galena in collectorless and collector flotation systems, particularly in strong alkaline media, was studied. The results show that, with pHvalue higher than 12.5 and potentials below 0.17 V, the oxidation products ofgalena are elemental sulfur andHPbO^-₂. Elemental sulfurwas present on the mineral surface in excess of oxidized lead species due to dissolution of HPbO^-₂, which is beneficial to the flotation of galena. Under the same conditions, sphalerite and pyrite were depressed as a result of significant surface oxidation. Diethyldithiocarbamate (DDTC) was found to be the most suitable collector for galena flotation in strongly alkaline media. The very potential produced hydrophobic PbD2—the surface reaction product of DDTC with galena, is 0 to 0.2 V. Meantime DDTC can depress the surface over-oxidation of galena .Investigations also indicate that, in the range of -0.9 V to 0.6 V, hydrophobic PbD₂can be firmly adsorbed on galena.