中文摘要：

通过浮选实验研究了两种不同结构的有机抑制剂古尔胶和鞣酸以及这两种药剂与乙基黄药不同添加顺序对方铅矿、黄铜矿及黄铁矿浮选行为的影响。当先加入古尔胶时，古尔胶对三种硫化矿抑制作用较强；而古尔胶后于乙基黄药加入时，古尔胶对三种硫化矿的抑制作用明显减弱。鞣酸与乙基黄药不同的添加顺序不影响鞣酸对黄铁矿和方铅矿的抑制作用。紫外光谱研究表明，古尔胶对乙基黄药在三种硫化矿表面吸附没有影响，而鞣酸能够阻碍乙基黄药在硫化矿表面吸附。红外光谱研究表明，鞣酸通过化学作用吸附在方铅矿表面，因此能够抑制吸附了乙基黄药的硫化矿。

英文摘要：

The effects of two types of organic depressants, guar gum and tannic acid, on the flotation of galena, chalcopyrite and pyrite were investigated using micro-flotation tests, and different addition orders of the two reagents and ethyl xanthate were also stud-ied. When guar gum is added first, its depression effect on sulfides is considerable;but when ethyl xanthate is added first, guar gum has little depression effect on sulfide flotation. Tannic acid depresses pyrite and galena whatever addition order of ethyl xanthate. The interaction between guar gum or tannic acid and ethyl xanthate on the sulfide surface was studied by UV spectroscopy. It is indicated that guar gum has no impact on the adsorption of ethyl xanthate on the sulfide surface, while tannic acid can prevent the adsorption of ethyl xanthate. Infrared spectroscopy analysis suggests that tannic acid adsorbs on the galena surface by chemical action, which is the reason that tannic acid can depress sulfides adsorbing ethyl xanthate.