Effect of iron transformation on Acidithiobacillus ferrooxidans bio-leaching of clay vanadium residue  

铁转化对氧化亚铁硫杆菌生物浸出黏土钒渣的影响（英文）

作　　者：FENG Ya-li WANG Hong-jun LI Hao-ran CHEN Xi-pei DU Zhu-wei KANG Jin-xing 冯雅丽;王洪君;李浩然;陈熹沛;杜竹玮;康金星(School of Civil and Resource Engineering, University of Science and Technology Beijing;Key State Laboratory of Biochemical Engineering, Institute of Process Engineering,Chinese Academy of Sciences)

机构地区：[1]School of Civil and Resource Engineering, University of Science and Technology Beijing [2]Key State Laboratory of Biochemical Engineering, Institute of Process Engineering,Chinese Academy of Sciences

出　　处：《Journal of Central South University》2019年第4期796-805,共10页中南大学学报（英文版）

基　　金：Project(DY135-B2-15) supported by the China Ocean Mineral Resource R&D Association;Project(2015ZX07205-003) supported by Major Science and Technology Program for Water Pollution Control and Treatment,China;Projects(21176242,21176026) supported by the National Natural Science Foundation of China

摘　　要：The acid bio-leaching process of vanadium extraction from clay vanadium water-leached residue was studied and the effect of the performance of iron transformation was investigated.Acidithiobacillus ferrooxidans affects the dissolution of vanadium through the catalytic effect on Fe^3+/Fe^2+couple and material exchange.The passivation of iron settling correlates with ferrous ion content in bio-leaching solution.In medium containing A.ferrooxidans and Fe(Ⅲ),the increment in Fe(Ⅱ)concentration leads to the formation of jarosite,generating a decline in vanadium extraction efficiency.Analysis of cyclic voltammetry shows that Fe(Ⅱ)ion is apt to be oxidized and translated into precipitate by A.ferrooxidans,which strongly adsorbed to the surface of the residue.Fe(Ⅲ)ion promotes the vanadium extraction due to its oxidizing activity.Admixing A.ferrooxidans to Fe(Ⅲ)medium elevates the reduction of low valence state vanadium and facilitates the exchange of substance between minerals and solution.This motivates 3.8%and 21.8%increments in recovery ratio and leaching rate of vanadium compared to the Fe(Ⅲ)exclusive use,respectively.Moreover,Fe(Ⅱ)ion impacts vanadium extraction slightly in sterile medium but negatively influences vanadium leaching in the presence of bacteria.本文研究了黏土钒矿水浸渣的生物提钒工艺,考察了浸出过程中铁转化对钒生物浸出的影响。氧化亚铁硫杆菌通过催化Fe^(3+)/Fe^(2+)电对循环及物质交换影响钒溶解;过程中铁的沉积与体系亚铁离子含量有关。在含有氧化亚铁硫杆菌和Fe(Ⅲ)介质中,Fe(Ⅱ)浓度的增加导致黄钾铁矾的形成,从而致使钒浸出效率下降。循环伏安分析表明,氧化亚铁硫杆菌易氧化Fe(Ⅱ)离子并转化为沉淀物,强烈吸附在浸渣表面。Fe(Ⅲ)离子因其高氧化活性而促进钒浸出。含氧化亚铁硫杆菌和Fe(Ⅲ)溶浸体系可提高低价态钒物种还原,加速矿物与溶液间的物质交换,较仅含Fe(Ⅲ)体系钒的回收率和浸出率分别提高3.8%和21.8%。此外,Fe(Ⅱ)离子在无菌介质中对钒提取影响较小,而有菌存在时负向影响钒浸出。

关 键 词：iron ion cycle Acidithiobacillus ferrooxidans PASSIVATION cyclic valtammetry clay vanadium 

分 类 号：TF841.3[冶金工程—有色金属冶金]