Application and Quantum Chemical Analysis of Novel Sulfur-Containing Heterocyclic Inhibitors in Separation of Molybdenite and Galena

In the traditional separation of molybdenum and lead, phosphorus nox is used as an inhibitor, which has serious toxicity and pollution. In order to reduce the content of lead in molybdenum concentrate from Jinduicheng, the lead inhibition effects of mercaptopropanol, L-cysteine, 1, 3-oxythiopentane carboxylic acid and tiopronin with weak toxicity were compared, and the amount of inhibitor were investigated. After comparison, 1, 3-oxythiopentane carboxylic acid was selected as the inhibitor of molybdenum-lead-bearing concentrate in Jinduicheng. After condition test, molybdenum concentrate can be obtained with molybdenum grade of 52.20%, recovery rate of 85.01% and lead content of 0.010% through one roughings and five cleanings when the regrinding fineness of -38 μm was 80%. The effect of 1, 3-oxythiopentane carboxylic acid is equivalent to that of phosphorus Knox. The characteristics of frontier orbits of galena and molybdenite were calculated by means of coordination chemistry and density functional theory, and the characteristics of frontier orbits of metal sites in galena and molybdenite were analyzed. It is pointed out that the symmetry of frontier orbits of the inhibitors is the key to affect the selectivity of inhibitors.