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浸矿微生物氟抑制机理及铁的竞争络合作用

李想 温建康 莫晓兰 武彪 尚鹤 武名麟 王淀佐 杨洪英

李想, 温建康, 莫晓兰, 武彪, 尚鹤, 武名麟, 王淀佐, 杨洪英. 浸矿微生物氟抑制机理及铁的竞争络合作用[J]. 工程科学学报, 2018, 40(10): 1223-1230. doi: 10.13374/j.issn2095-9389.2018.10.009
引用本文: 李想, 温建康, 莫晓兰, 武彪, 尚鹤, 武名麟, 王淀佐, 杨洪英. 浸矿微生物氟抑制机理及铁的竞争络合作用[J]. 工程科学学报, 2018, 40(10): 1223-1230. doi: 10.13374/j.issn2095-9389.2018.10.009
LI Xiang, WEN Jian-kang, MO Xiao-lan, WU Biao, SHANG He, WU Ming-lin, WANG Dian-zuo, YANG Hong-ying. Mechanism of fluoride inhibition on bioleaching bacteria and competitive complexation of ferric ions[J]. Chinese Journal of Engineering, 2018, 40(10): 1223-1230. doi: 10.13374/j.issn2095-9389.2018.10.009
Citation: LI Xiang, WEN Jian-kang, MO Xiao-lan, WU Biao, SHANG He, WU Ming-lin, WANG Dian-zuo, YANG Hong-ying. Mechanism of fluoride inhibition on bioleaching bacteria and competitive complexation of ferric ions[J]. Chinese Journal of Engineering, 2018, 40(10): 1223-1230. doi: 10.13374/j.issn2095-9389.2018.10.009

浸矿微生物氟抑制机理及铁的竞争络合作用

doi: 10.13374/j.issn2095-9389.2018.10.009
基金项目: 

国家自然科学基金资助项目(51404031)

详细信息
  • 中图分类号: TF88

Mechanism of fluoride inhibition on bioleaching bacteria and competitive complexation of ferric ions

  • 摘要: 含氟矿石中生物浸出技术推广应用存在瓶颈,究其原因在于伴随含氟脉石矿物溶解,氟对浸矿微生物有较强的抑制作用.本研究利用氟的水化学特性,通过添加可形成稳定络合物的物质来转换F离子存在形态,进而使浸矿微生物可以耐受高氟环境.本文系统研究了氟对细菌的抑制机理,明确了氟的真实毒性形态HF,发现了氟对细菌存在跨膜抑制作用,氟胁迫条件下,干细胞内氟离子质量分数明显高于无氟对照组达到18%以上.选择在生物冶金体系中常见Fe3+做为研究对象,研究了Fe3+对F-的络合解毒作用,热力学分析结果可知,Fe3+可以与HF发生一级竞争络合反应,破坏HF络合结构.在铁离子存在条件下,细菌最高可以耐受F-质量浓度1.0 g·L-1的环境下生长.铁氟络合形态分析可知,只有当培养基中Fe3+质量浓度5倍过量于F-质量浓度,细菌才能正常生长,对应的FeF2+在氟化物中质量分数达45%时,而游离氟离子浓度为2.87×10-5 mol·L-1.络合机理实验结果表明,根据配位化学原理,随着F-/Fe3+浓度比的减小,配体浓度相对较低,氟与铁的络合物向低配位方向移动,可以通过调整培养基中的氟铁浓度比来调整氟铁络合产物,使细菌在高氟环境中生长成为可能.
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  • 收稿日期:  2018-05-18

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