萃取有机相对浸矿细菌的影响

来源期刊：中南大学学报(自然科学版)2001年第3期

论文作者：邱冠周 刘晓荣 胡岳华

文章页码：243 - 246

关键词：浸铜;萃取;有机相;细菌;效率

Key words：copper; extraction; organic phase; bacteria; efficiency

摘    要：为了了解细菌浸矿效率降低的原因,研究了铜溶剂萃取过程中的相夹带情况及流失于浸出系统的萃取有机相对浸矿细菌的影响,提出了相应的提高细菌浸出效率的有效措施.结果表明:当有机相中Lix984N的体积分数为1.5%时,萃余液中夹带的O/W型乳液滴的有效粒径约为600~1 000 nm,其中部分液滴会在较长时间内稳定存在;由于有机相中存在酚、硫醇、萘类稠环芳烃等杀菌剂及多种表面活性成分,使污染环境中细菌的生长周期延长了5 d,浸矿能力降低;不同组成的有机相抑制细菌生长的能力为(由强到弱):260号工业煤油+1.5%Lix984N→260号工业煤油→循环有机相→正辛烷+1.5%Lix984N→正辛烷.

Abstract: The entrainmentof solvent in the aqueous raffinate in coppersolvent extraction and the effects of solvent lost ibioleaching circuiton leachingbacteria are studied. The effective diameters of entrainment droplets in raffinate range fro 600 nm to 900 nmwhen the volume factorofLix984N is 1.5%, and some dropletswith smaller size could exist in aqueous phase for a long time. The activity and leaching ability of bacteria are deteriorated seriously because there are more kinds of bactericides and surfactants in organic phases, such as phenol and naphthalene. The growing period of bacteria is prolonged by 5 d and leaching ability deteriorated. The bacteriostasis of different composition of organic phases abates in the following order: 260^# kerosene +1.5%Lix984N→260^#kerosene→circulated organic phase sampled from factory →octanol+1.5%Lix984N→octanol. Some effective ways to enhance bioleaching efficiency are suggested.