Effects of fulvic acid and Ca2+ coexistence on the formation of secondary ferrate minerals mediated by Acidithiobacillus ferrooxidans
In order to explore the effects of fulvic acid and Ca2+ coexistence on the oxidation of Fe2+ and the formation of secondary ferrate minerals by Acidithiobacillus ferrooxidans in the treatment of acid mine drainage,pH,Fe2 oxidation rate,Fe precipitation rate,and secondary ferrate minerals phase and radical group were analyzed.Results showed that Ca2+ really had the ability to enhance the oxidation of Fe2+by Acidithiobacillus ferrooxidans.Low mass concentration of fulvic acid(0.2 g/L)promoted the oxidation ability of Acidithiobacillus ferrooxidans,but high mass concentration of fulvic acid(0.4 g/L)inhibited.However,increasing Ca2+concentration could weaken the inhibition effect of fulvic acid on Acidithiobacillus ferrooxidans.The formed secondary ferrate minerals were analyzed by X-ray diffractometer and Fourier transform infrared spectrometer.The results showed that high mass concentration of fulvic acid helped to form another secondary ferrate mineral carphosiderite.
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