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- W1699207864 abstract "Abstract This study was aimed to evaluate the feasibility of an iron-phosphate coating on pyrite surfaces for inhibiting an oxidation that is expected to prevent acid mine drainage (AMD). Prior to the experiments, pyrite samples (av. 425-850 μm in size) were mixed with sand (av. 1-2 mm in size) with a ratio of 1:4. Coating process was conducted in batch experiments that were treating with various concentrations of coating solutions, i.e., hydrogen peroxide (H 2 O 2 ), sodium acetate (NaAc) and potassium dihydrogen phosphate (KH 2 PO 4 ) at different contact times. Subsequently, leaching test was performed in columns (10 mm in diameter) using 0.145 M of the oxidizing solution (H 2 O 2 ) at different times. Remaining phosphate, releasing iron and pH were recorded to estimate the degree of pyrite oxidation. Treating with the coating solution, a mixture of 0.3 M KH 2 PO 4 + 0.2 M H 2 O 2 + 0.2 M NaAc, with 20 min contact time appeared to be the optimum condition to create iron-phosphate formation on pyrite surfaces. Phosphate remains in the solution is the lowest concentration after coating process (0.497-0.745 mg/L). The treated pyrite yielded leaching solution with pH ranging from 6.45 to 7.23 and low iron concentration releasing (0.008-0.151 mg/L). In addition, phosphate coated on the pyrite surface was quantitatively analyzed using Electron Probe Micro Analyzer (EPMA);consequently, the highest amount was also detected from the samples treated by such solution. Keywords : acid mine drainage, pyrite oxidation, iron-phosphate coating" @default.
- W1699207864 created "2016-06-24" @default.
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- W1699207864 date "2013-06-01" @default.
- W1699207864 modified "2023-09-26" @default.
- W1699207864 title "Suppression of Pyrite Oxidation with Iron-phosphate Coating: Technique for Prevention of Acid Mine Drainage" @default.
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