改性煤矸石对煤矿酸性废水中Fe^(2+)、Mn^(2+)的吸附

Modified Gangue for Coal Mine Wastewater's Fe^(2+) and Mn^(2+) Adsorption

针对煤矿酸性废水中Fe、Mn含量高的特点,采用自燃煤矸石及NaCl、NaOH、HCl活化改性煤矸石对废水中的Fe^(2+)和Mn^(2+)进行吸附试验,并采用X射线衍射(XRD)和扫描电镜(SEM)对样品进行表征,考察了自燃煤矸石及NaCl、NaOH、HCl活化改性煤矸石对Fe^(2+)和Mn^(2+)的吸附特性。结果表明:Na OH改性煤矸石对Fe^(2+)和Mn^(2+)的吸附效果最佳。自燃煤矸石对Fe^(2+)的吸附过程由膜扩散和颗粒内扩散联合控制,NaCl和NaOH改性煤矸石对Fe^(2+)的吸附符合一级动力学模型,HCl改性煤矸石对Fe^(2+)的吸附符合二级动力学模型。自燃煤矸石及改性自燃煤矸石对Fe^(2+)的吸附现象均符合Freundlich吸附等温式模型。自燃煤矸石及改性自燃煤矸石对Mn^(2+)的吸附均符合二级动力学模型和Langmuir吸附等温式模型。

For coal mine acid waste water containing high content Fe, Mn characteristics, using the spontaneous combustion of coal gangue and NaCl, NaOH, HCl activation modified gangue to adsorb Fe^2＋ and Mn2＋, and using X-ray diffraction （XRD） and scanning electron microscopy （SEM） to characterize the samples, investigating adsorption properties of spontaneous combustion of coal gangue and NaCI, NaOH, HCI activated modified gangue of Fe^2＋ and Mn^2＋. The results showed that： adsorption of NaOH modified gangue of Fe^2＋ and Mn^2＋ is the best. The adsorption process of spontaneous combustion coal gangue on Fe^2＋ is combined controlled by the diffusion of the film diffusion and the intragranular diffusion, NaCl and NaOH modified coal gangue adsorption of Fe^2＋ modification of adsorption phenomena are in line with first-order kinetics model, HCl modified gangue of Fe^2＋ adsorption is in line with second-order kinetic model. Spontaneous combustion of coal gangue and modified spontaneous combustion of coal gangue on Fe^2＋ adsorption is in line with Freundlich isotherm model. Spontaneous combustion of coal gangue and modified spontaneous combustion of coal gangue on Mn^2＋ of adsorption is in line with second-order kinetic model and the Langmuir adsorption isotherm model.