Fe^(2+)浓度对Acidithiobacillus ferrooxidans耐铜性的影响  

Impact of Fe(Ⅱ) Concentrations on the Tolerance of Cu(Ⅱ) by Acidithiobacillus ferrooxidans

作　　者：符翔[1] 王红梅[1] 刘乔[1] 周健平[1] 

机构地区：[1]中国地质大学(武汉)生物地质与环境地质国家重点实验室,湖北武汉430074

出　　处：《矿物学报》2011年第4期662-667,共6页Acta Mineralogica Sinica

基　　金：国家重点基础研究发展计划资助(2007CB815601);国家自然科学基金(批准号:41072253)

摘　　要：嗜酸性氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans)是铜矿生物冶金中应用最广泛的微生物之一。但在冶金过程中淋滤出来的Cu2+等重金属逐渐积累,达到一定的浓度后就会抑制A.ferrooxidans的生长,从而降低冶金的效率。本文着重研究了Fe2+初始浓度对A.ferrooxidans耐铜性的影响。实验中ρ(Cu2+)变化范围为0～5.0 g/L。结果表明,当ρ0(Fe2+)为6.7 g/L时,A.ferrooxidans仅在Cu2+为0～0.4 g/L的体系中能显著地氧化Fe2+进行生长;当Cu2+≥0.5 g/L时,A.ferrooxidans生长完全受到抑制。将ρ0(Fe2+)增加到8.9 g/L,A.ferroox-idans在0.5、1.0、2.0和3.0 g/L Cu2+的培养基中也能明显氧化Fe2+,并最终将其完全氧化,Cu2+对A.ferrooxidans生长抑制作用仅出现在4.0和5.0 g/L Cu2+的体系中。因此提高体系中亚铁离子的浓度能提高菌体对Cu2+的耐受力。研究结果对铜矿的生物冶金具有重要意义。Acidithiobacillus ferrooxidans is one of the key microorganisms exploited in copper bioleaching process.However the accumulated Cu2＋ from bio-hydrometallurgy will inhibit the growth of A.ferrooxidans and thus greatly decrease the efficiency of bioleaching.In this study,the impact of ρ0（Fe2＋） on copper（Cu2＋） tolerance by A.ferrooxidans was investigated.No growth was observed in the systems with ρ0（Fe2＋）=6.7 g /L when ρ（Cu2＋） was ≥0.5 g/L.However,when ρ0（Fe2＋） was increased to 8.9 g/L,growth was observed in 3.0 g/L Cu2＋ amended systems and Fe2＋ conld be completely oxidized.Thus the tolerance of Cu2＋ by A.ferrooxidans is closely related to the ρ0（Fe2＋） in the systems.This result has great significance in copper bioleaching practice.

关 键 词：嗜酸性氧化亚铁硫杆菌(A.ferrooxidans) 耐铜性 生物浸矿 亚铁的氧化 

分 类 号：P579[天文地球—矿物学] Q939.99[天文地球—地质学]