CAJ | 학술논문

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650 mV (vs SHE)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20 g/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650 mV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.
재합성적포외취합물(EPS)용액중,연구불동기시총철량、불동Fe(Ⅲ)여Fe(Ⅱ)마이비조건하기산양화아철류간균침출황동광과정중pH、전위、가용성철리자화Cu2+농도수침출시간적변화.결과표명:당용액전위저우650 mV (vs SHE)시,인세균산생적EPS가통과서응황철갑범연완오염,즉사철리자농도체도20 g/L,황철갑범대세균침출황동광적조애작용야불시치명적,단수착철리자농도적증가이증가；세균양화적철리자용역흡부재황동광표면적EPS표층,유황철갑범적EPS층시약리자확산벽루,세균통과파EPS공간내외적Fe2+양화성Fe3+,진일보창조고우650 mV적전위,도치EPS층리자확산성능적쾌속악화,엄중지화불가역지조애생물침출황동광.
The changes of pH,redox potential,concentrations of soluble iron ions and Cu2+ with the time of bioleaching chalcopyrite concentrates by acidithiobacillus ferrooxidans were investigated under the different conditions of initial total-iron amount as well as mole ratio of Fe(Ⅲ) to Fe(Ⅱ) in the solutions containing synthetic extracellular polymeric substances (EPS).When the solution potential is lower than 650 mV (vs SHE),the inhibition of jarosites to bioleaching chalcopyrite is not vital as EPS produced by bacteria can retard the contamination through flocculating jarosites even if concentration of Fe(Ⅲ) ions is up to 20 g/L but increases with increasing the concentration of Fe(Ⅲ) ions; jarosites formed by bio-oxidized Fe3+ ions are more easy to adhere to outside surface of EPS space on chalcopyrite; the EPS layer with jarosites acts as a weak diffusion barrier to further rapidly create a high redox potential of more than 650 mV by bio-oxidizing Fe2+ ions inside and outside EPS space into Fe3+ ions,resulting in a rapid deterioration of ion diffusion performance of the EPS layer to inhibit bioleaching chalcopyrite severely and irreversibly.