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在合成的胞外聚合物(EPS)溶液中,研究不同起始总铁量、不同Fe(III)与Fe(II)摩尔比条件下嗜酸氧化亚铁硫杆菌浸出黄铜矿过程中pH、电位、可溶性铁离子和Cu2+浓度随浸出时间的变化。结果表明:当溶液电位低于650mV(vsSHE)时,因细菌产生的EPS可通过絮凝黄铁钾钒延缓污染,即使铁离子浓度达到20g/L,黄铁钾钒对细菌浸出黄铜矿的阻碍作用也不是致命的,但随着铁离子浓度的增加而增加;细菌氧化的铁离子容易吸附在黄铜矿表面的EPS表层,有黄铁钾钒的EPS层是弱离子扩散壁垒,细菌通过把EPS空间内外的Fe2+氧化成Fe3+,进一步创造高于650mV的电位,导致EPS层离子扩散性能的快速恶化,严重地和不可逆地阻碍生物浸出黄铜矿。
In the synthesis of extracellular polymeric (EPS) solution, the pH value of the process of leaching Thiobacillus ferrooxidans with different initial total iron, different Fe (III) and Fe (II) Potential, soluble iron and Cu2 + concentration with the leaching time changes. The results showed that when the solution potential was lower than 650mV (vsSHE), bacterial EPS could be decontaminated by flocculation of ferrovanadium and vanadium, which hindered bacterial leaching of chalcopyrite even with an iron concentration of 20g / L The effect is not fatal, but increases with the concentration of iron ions; bacteria oxidized iron ions easily adsorbed on the chalcopyrite surface of the EPS surface layer, the ferrite potassium vanadium EPS layer is a weak ion diffusion barrier bacteria through Oxidation of Fe2 + inside and outside the EPS space to Fe3 + further creates a potential above 650 mV, causing a rapid deterioration of the ion diffusion properties of the EPS layer, hindering the bioleaching of chalcopyrite severely and irreversibly.