Study of the Mechanism of Dearsenification of Arsenopyrite Enhanced by Mechanically Modified Pyrite and Bacteria

This study investigated the impact of mechanically modified pyrite on dearsenification arsenopyrite through bacterial oxidation. Pyrite was using a planetary high-energy ball mill, and resulting changes in crystal structure were characterized particle size analysis, specific surface area measurements, scanning electron microscopy (SEM), Raman spectroscopy, X-ray diffraction (XRD). Pearson correlation analysis employed to examine relationship between oxidation arsenopyrite. The also mechanism arsenic removal with varying degrees mechanical modification during bio-oxidation. key findings are as follows: (1) maximum extent by bacteria achieved at degree 400 r·min−1 reached 96.01%, which 14.49% higher than that for unmodified 24.13% absence pyrite. At this degree, exhibited median diameter 1.33 μm (minimum) 3123 m2·kg−1 (maximum). (2) revealed significant negative grain pyrite, positive amorphous A smaller size, larger area, associated dearsenification. (3) enhanced attributed autocatalytic dissolution. galvanic effect directly dearsenification, while facilitated direct bacteria, releasing amount Fe3+ indirectly enhancing