Selective leaching of copper and zinc from primary ores and secondary mineral residues using biogenic ammonia

JOURNAL OF HAZARDOUS MATERIALS

卷:403

Article

Williamson, Adam J.^1,5  Verbruggen, Florian¹  Rico, Vania S. Chavez¹  Bergmans, Jef³  Spooren, Jeroen³  Yurramendi, Lourdes⁴  Du Laing, Gijs²  Boon, Nico¹  Hennebel, Tom¹ 

[1] Univ Ghent, Fac Biosci Engn, Ctr Microbial Ecol & Technol, Coupure Links 653, B-9000 Ghent, Belgium

[2] Univ Ghent, Fac Biosci Engn, Dept Green Chem & Technol, Coupure Links 653, B-9000 Ghent, Belgium

[3] VITO Nv, Flemish Inst Technol Res, Waste Recycling Technol, Boerentang 200, B-2400 Mol, Belgium

[4] TECNALIA, Energy & Environm Div, Mikeletegi Pasealekua 2, E-20009 Donostia San Sebastian, Gipuzkoa, Spain

[5] SIM Vzw, Technol Pk 935, B-9052 Zwijnaarde, Belgium

关键词: Biohydrometallurgy;    Ureolysis;    Metal recovery;    Tailings;    Waste processing;   

DOI  :  10.1016/j.jhazmat.2020.123842

来源: Elsevier

【 摘 要 】

With the number of easily accessible ores depleting, alternate primary and secondary sources are required to meet the increasing demand of economically important metals. Whilst highly abundant, these materials are of lower grade with respect to traditional ores, thus highly selective and sustainable metal extraction technologies are needed to reduce processing costs. Here, we investigated the metal leaching potential of biogenic ammonia produced by a ureolytic strain of Lysinibacillus sphaericus on eight primary and secondary materials, comprised of mining and metallurgical residues, sludges and automotive shredder residues (ASR). For the majority of materials, moderate to high yields (30-70%) and very high selectivity (>97% against iron) of copper and zinc were obtained with 1 mol L-1 total ammonia. Optimal leaching was achieved and further refined for the ASR in a twostep indirect leaching system with biogenic ammonia. Copper leaching was the result of local corrosion and differences in leaching against the synthetic (NH4)(2)CO3 control could be accounted for by pH shifts from microbial metabolism, subsequently altering free NH3 required for coordination. These results provide important findings for future sustainable metal recovery technologies from secondary materials.

【 授权许可】

Free