煤系黄铁矿氧化溶解地球化学动力学研究

对不同煤系的黄铁矿样品进行了氧化溶解动力学实验.研究表明，在模拟煤矿酸性水（pH≈2）的环境下，煤系黄铁矿的氧化速率随液相中Fe³⁺浓度的增加而增加，反应为Fe³⁺浓度的一级反应.温度对黄铁矿氧化反应速率有明显影响，温度每升高10 K，氧化速率平均增加约2倍.不同黄铁矿样品氧化溶解反应的活化能在50 kJ/mol以上，表明反应受表面反应的控制.不同来源煤系黄铁矿样品所含的杂质种类和含量不同，可能是造成其抗风化能力差异的重要因素，反映在其反应速率以及对温度的敏感程度，但反应机理基本一致.

The kinetics of oxidation reaction of pyrites from coal-bearing measure

The kinetic experiments of oxidation reaction of impure pyrites from coal bearing measure were conducted.The results indicate that the reaction rate of pyrite samples increases with the increase of the initial Fe3+ concentration.The reaction rate is proportional to free Fe3+ concentration， i.e.oxidation reaction of pyrite is first order reaction of free ferric iron concentration.The temperature has important impact on reaction rate；the average reaction rate increases about 2 times when the temperature increases 10 K.The activation energy of oxidation reaction of pyrite samples are above 50 kJ/mol， which indicates that a surface reaction controls the rate within temperature range of 25~45 ℃.Impurities of pyrite may be the important factor affecting oxidation reaction rate of pyrite because different pyrites with different impurities show different resistance to weathering.The mechanism of oxidation reaction of heterogeneous pyrite samples appears to be similar although their oxidation reaction rates and sensitivity to temperature show different.