A combined abiotic oxidation-precipitation process for rapid As removal from high-As(III)-Mn(II) acid mine drainage and low As-leaching solid products
作者： Zidan Yuan , Guoqing Zhang , Xu Ma , Le Yu , Xin Wang
DOI: 10.1016/J.JHAZMAT.2020.123360
关键词: Ferrihydrite 、 Nuclear chemistry 、 Hydroxide 、 Neutralization 、 Catalytic oxidation 、 Leaching (metallurgy) 、 Acid mine drainage 、 Reagent 、 Chemistry 、 Catalysis
摘要: Abstract A combination process of Fenton-like and catalytic Mn(II) oxidation via molecular oxygen-induced abio-oxidation As(III)-Mn(II)-rich acid mine drainage (AMD) is developed to rapidly efficiently remove As obtain low As-leaching solids in this study. The effect pH, temperature, oxygen flow rate neutralization reagent on removal was investigated. results showed that pH important efficiency, which achieved maximum 0.25–2 h, but decreased from ∼100 % ∼92.6 with the increase 5–9. temperature played key roles As(III) oxidation. oxidized 16.8 67.1% 98.6–99.0 occurred as increasing 5–9, 25–95 °C 0–2.4 L min−1. NaOH or Ca(OH)2 base less removal. mechanism involved reaction between Fe(II) O2 for produced Fe(III) (oxy)hydroxide association As(III + V) Mn(II), formation Mn(III, IV) oxides, further by oxides. As-bearing six-line ferrihydrite main solid product fixation. 8, 95 1.6 min−1 were optimal
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