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古爾膠和鞣酸添加方式對硫化礦浮選的影響

Influence of the addition orders of guar gum and tannic acid on sulfide flotation

  • 摘要: 通過浮選實驗研究了兩種不同結構的有機抑制劑古爾膠和鞣酸以及這兩種藥劑與乙基黃藥不同添加順序對方鉛礦、黃銅礦及黃鐵礦浮選行為的影響.當先加入古爾膠時,古爾膠對三種硫化礦抑制作用較強;而古爾膠后于乙基黃藥加入時,古爾膠對三種硫化礦的抑制作用明顯減弱.鞣酸與乙基黃藥不同的添加順序不影響鞣酸對黃鐵礦和方鉛礦的抑制作用.紫外光譜研究表明,古爾膠對乙基黃藥在三種硫化礦表面吸附沒有影響,而鞣酸能夠阻礙乙基黃藥在硫化礦表面吸附.紅外光譜研究表明,鞣酸通過化學作用吸附在方鉛礦表面,因此能夠抑制吸附了乙基黃藥的硫化礦.

     

    Abstract: 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 studied. 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.

     

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