【摘要】 用动态法研究了不同温度、pH值和H₂O₂浓度下,对照和经KH₂PO₄处理的黄铁矿氧化反应的动力学,结果表明,用0.1mol·l^-1H₂O₂十0.01mol·l^-1KH₂PO₄（pH5）混合液淋洗黄铁矿后,黄铁矿表面可形成磷酸铁膜,该膜能有效地抑制黄铁矿的氧化.25C时.对照和处理样品与0.1mol·l^-1H₂O₂（pH3）反应的速度常数分别为66.27μg·min^-111.22μg·min^-140C时,分别为199.34μg·min^-1和46.31μg·min^-1两温度下处理样品的反应速度常数与对照相比分别下降了83%和77%另一方面,用lmol·l（-1）HCI溶解表面磷酸铁膜后,黄铁矿氧比速率（25C）显著提高,速度常数达75.44 μg·min^-1,并大于对照.pH值和H₂O₂浓度对时照和处理样品的氧化行为也有很大的影响.在更高的pH值和H₂O₂浓度时,处理样品同样显示出良好的抗氧化能力.在动态条件下.黄铁矿与H₂O₂的氧化反应服从假零级反应规律更多还原

【Abstract】 Kinetics of oxidation reaction of control and the sample treated with KH2PO4 was studied by dynamic method with different temperatures, pH and H2O2 concentrations. The results showed that the film of FePO4 formed on the surface of the pyrite leached with the concentration containing 0.1mol·l-1 H2O2 and 0. 01mol·l-1 KH2PO4 at pH 5. which could control the oxidation of pyrite effectively. The rate constants of control and treated pyrite reacted with 0.1mol·l-1 H2O2 (pH 3) were 66. 27μg·min-1 and 11. 22 μg·min-1 respectively at 25℃ , 199.34μg·min-1 and 46. 31μg·min-1 respectively at 40℃. In comparision with control, the rate constants of treated pyrite reduced by 83% at 25℃　and by 77% at 40℃. On the other hand, after the pyrite with film of FePO4 was leached by 1mol·l-1 HCl, the rate constant (25℃) increased greatly, which got to 75.44μg·min-1, more than that of the control. The concentration of H2O2 and pH had significant effect on the behavior of pyrite oxidation. Also, the sample coated with FePO4 showed the good resistance to oxidation at higher pH and higher H2O2 concentration. The oxidation of pyrite in following H2O2 solution obeyed to pseudo zero order reaction.更多还原