Abstract: This study investigated the effect of dihydromyricetin on the flotation behavior of chalcopyrite and galena throught pure mineral flotation test, contact angle measurement, ultraviolet spectrophotometer and X-ray photoelectron spectroscopy analysis. At the same time, the mechanism of dihydromyricetin on the inhibition of galena was also studied. The research results indicate that the flotation index of single mineral is in good condition. When using 1.0×10-4 mol/L dihydromyricetin in the flotation test of artificial mixture, the grade and recovery rate of copper concentrate are 29.28wt% and 99.04%, respectively, and the grade and recovery rate of lead concentrate are 86.29wt% and 87.55%, respectively. The larger the contact angle on the mineral surface, the more hydrophobic and floatable of the mineral is. The contact angle measurement show that after adding dihydromyricetin, the contact angle of chalcopyrite decreases by 5.40°, while the contact angle of galena decreases by 13.78°, which significantly affects the wettability of galena surface. The adsorption capacity test results show that the galena has a higher affinity for dihydromyricetin than chalcopyrite. After treatment with dihydromyricetin, the adsorption capacity of galena on the mineral surface significantly decreases, while the adsorption capacity of chalcopyrite changes slightly. The difference in the adsorption amount of the collector further increases the floatability difference between the two. The XPS results show that the content of Pb(OH)2 increases significantly after dihydromyricetin treatment, from 11.72% to 24.73%, and the hydroxyl group of dihydromyricetin and the metal hydroxide oxidized on the surface of galena are adsorbed on the mineral surface through the interaction of Bronsted acid and alkali, which hinders the interaction between the collector and the mineral, what's more, this leads to two different flotation phenomena of chalcopyrite and galena.

Key words: chalcopyrite, galena, flotation separation, dihydromyricetin, mechanism of depression

摘要： 通过纯矿物浮选试验、接触角测量、紫外分光光度计(UV)和X射线光电子能谱(XPS)分析考察了二氢杨梅素(DMY)对黄铜矿和方铅矿浮选行为的影响，并研究了DMY对方铅矿的抑制作用机理。在人工混合矿浮选试验中，使用1.0×10-4 mol/L的DMY作为抑制剂，获得铜精矿品位和回收率分别为29.28wt%和99.04%，铅精矿品位和回收率分别为86.29wt%和87.55%。接触角测量结果表明，加入DMY后方铅矿接触角降低了13.78°，显著影响了方铅矿表面的润湿性。吸附量测试结果表明，方铅矿对DMY的亲和力大于黄铜矿，同时经DMY处理后，方铅矿表面捕收剂吸附量显著降低，而黄铜矿的变化较小，这种捕收剂吸附量的差异进一步增大了两者的可浮性差异。XPS分析结果表明，DMY的羟基与方铅矿表面氧化的金属氢氧化物通过Bronsted酸碱相互作用形成氢键，并吸附于矿物表面，从而阻碍了捕收剂与矿物的作用。

关键词: 黄铜矿, 方铅矿, 浮选分离, 二氢杨梅素, 抑制机理