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摘要本课题研究了在不同浓度的羟肟类萃取剂LIX860和LIX84IC分别污染生物浸出环境的情况下，氧化亚铁钩端螺旋菌的新陈代谢特征和浸铜行为。研究结果表明：两种萃取剂对氧化亚铁钩端螺旋菌的生长和氧化活性具有很强的抑制作用。培养基未被萃取有机相污染时，细菌生长72小时到达平稳期，然而含LIX860有机相污染时在48小时后依次出现了细菌死亡并且不再生长；同时含LIX84IC有机相污染时在60小时后也依次出现了细菌死亡并且不再生长。在浸矿过程中，未受污染时细菌保持着匀速上涨的趋势，且电位和铁离子浓度也匀速增加；然而受含LIX860、LIX84IC有机相污染时，细胞浓度、电位、全铁浓度等均比纯净浸矿过程的低且变化速度小。无污染环境中，、Fe3+/Fe2+逐渐变大，说明细菌活性好；受萃取有机相污染时Fe3+/Fe2+慢慢减小并趋向于稳定，溶液氧化还原电位增长缓慢，说明细菌活性受到了抑制。观察铁离子浓度与亚铁离子浓度曲线图，发现Fe3+/Fe2+的变化是由于在无污染环境下，铁离子不断地增大，亚铁离子趋于稳定在0.45左右，所以比值增大；在受萃取有机相污染的环境下，铁离子增长十分缓慢，亚铁离子浓度比无污染的大，说明细菌活性受到了抑制，造成了亚铁离子氧化过慢。最后综合对比分析，可发现在浸矿体系中，随着浸矿时间的增加，在150小时以后，细胞浓度开始有明显差距，可以发现萃取剂LIX860对氧化亚铁钩端螺旋菌的抑制作用比萃取剂LIX84IC的抑制作用更加大。因此，选择合适的萃取剂才能更加有效地提高浸出率。62019
毕业论文关键词：生物浸出；铜溶剂萃取；氧化亚铁钩端螺旋菌、LIX860、LIX84IC
Abstract This topic is studied in different concentrations of hydroxyl LIX860 oxime type extractants and pollution LIX84IC biological leaching environment, under the condition of Leptospirillum ferrooxidans and leaching of copper metabolism of the organism's behavior. The results show that the two kinds of extraction solvent for ferrous oxide hook end spiral bacteria growth and oxidation activity has a strong inhibitory effect. Medium is not contaminated by extraction of organic phase, bacterial growth reached a plateau 72 hours, however, contain LIX860 pollution on the organic phase after 48 hours in the growth of the bacterial death and no longer; Organic phase containing LIX84IC pollution at the same time in the 60 hours after also appear in the growth of the bacterial death and no longer. In the process of leaching ore, not contaminated bacteria remain uniform rising trend, and the potential and iron ion concentration also increased at a constant speed; However polluted by organic phase containing LIX860, LIX84IC, cell concentration, potential, total iron concentration is lower than that of the pure ore leaching process and a small change speed. Pollution-free environment, Fe3+/Fe2+ increases gradually, show good bacterial activity; Polluted by extraction of organic phase Fe3+/Fe2+ gradually reduced and tends to be stable, solution oxidation reduction potential growth is slow, that bacterial activity. Observation of iron ion concentration and the ferrous ion concentration curve, found that Fe3+/Fe2+ was due to changes in the pollution-free environment, iron ion increases constantly, ferrous ion to stabilize at around 0.45, so the ratio increases; In the environment polluted by extraction of organic phase, ferric ion growth is slow, ferrous ion concentration is greater than pollution-free, bacterial activity by inhibiting, caused the ferrous ion oxide too slow. The comprehensive comparison and analysis, it can be found in the ore leaching system, with the increase of ore leaching time, after 150 hours, cell concentration began to have obvious difference, can be found that the extracting agent LIX860 for ferrous oxide hook end spirochete inhibitory effect than extractant LIX84IC inhibition is more big. So, choose the suitable extractant can more effectively improve the leaching rate.