Bacterial-mediated recovery of copper from low-grade copper sulfide using fly ash and bacterial community dynamics  

作　　者：Wei Chen Ming Zhang Shenghua Yin Yun Zhou 

机构地区：[1]Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal,University of Science and Technology Beijing,Beijing 100083,China [2]School of Resources and Safety Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control,Wuhan University of Science and Technology,Wuhan 430081,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第5期1044-1055,共12页矿物冶金与材料学报(英文版)

基　　金：supported by China National Postdoctoral Program for Innovative Talents(No.BX20230041);China Postdoctoral Science Foundation(No.2024M750186);the Key Program of National Natural Science Foundation of China(No.52034001);Open Foundation of State Envir-onmental Protection Key Laboratory of Mineral Metallurgic-al Resources Utilization and Pollution Control(No.HB202303).

摘　　要：Bioleaching is confronted with problems,such as low efficiency,long production cycle length,and vegetation destruction.In order to solve problems above,fly ash and low-grade copper sulfide ores were used to investigate bioleaching behaviors and bacterial community succession.Results showed that copper recovery,bacterial concentration,total proportion of main leaching bacteria including Acidithiobacillus ferrooxidans,Acidibacillus ferrooxidans,and Leptospirillum ferriphilum,were improved through using appropriate dosage of fly ash.The maximum copper recovery of 79.87%and bacterial concentration of 7.08×10^(7)cells·mL^(-1)were obtained after us-ing 0.8 g·L^(-1)fly ash.Exclusive precipitation including Zn(Fe_(3)(SO_(4))_(2)(OH)_(6))_(2)and Mg(Fe_(3)(SO_(4))_(2)(OH)_(6))_(2)was found in sample added 0.8 g·L^(-1)fly ash,which reduced the effect of hazardous ions on bacteria and thus contributing to bacterial proliferation.Bacterial com-munity structure was differentiated,which indicated difference between original inoculation and sample used 0.8 g·L^(-1)fly ash was less than others.Total proportion of the three microorganism above accounted for more than 95%in all tests,especially in sample with 0.8 g·L^(-1)fly ash up to 99.81%.Cl^(-)and Ag^(+)contained in fly ash can act as catalytic agent,which contributed to conversion from smooth and dense passivation layer to sparse and scattered one,and therefore improving contact between ores,lixiviant,and bacteria.Using appropri-ate dosage of fly ash showed prospects in bioleaching.

关 键 词：low-grade copper sulfides fly ash bioleaching behavior bacterial community succession 

分 类 号：TF811[冶金工程—有色金属冶金]