摘要
采用自制的间歇反应器,以三价铁离子为氧化剂，对煤系黄铁矿的氧化动力学进行了系统的研究，在温度25～44℃，氧化剂Fe（Ⅲ）浓度4．0×10^-3～6．0×10^-3mol／L的范围内，黄铁矿的氧化速率RFe（Ⅱ），为1．97×10^-5～7．02×10^-5mol／（L·min）．在实验范围内，随温度的升高或[Fe（Ⅲ）]i的升高，黄铁矿的氧化速率增大，通过对氧化速率与温度、[Fe（Ⅲ）]i之间对应关系的回归分析．得到黄铁矿被Fe（Ⅲ）氧化的速率公式为RFe（Ⅲ）=5．05×10^4e^-45.54/RT[Fe（Ⅲ）]i^0.6，氧化反应的活化能为45．54kJ／mol．该值表明黄铁矿的氧化是表面反应控制的，而不是扩散控制的．
The oxidation kinetic behavior in pyrites from coal mine was investigated systemic ally by using Fe^3＋ as the oxidant in the homemade batch reactor. When the temperature was 25～44℃ and the concentration of the oxidant（Fe（ Ⅲ）） was 4.0×10^-3～6.0×10^-3mol/L, the rate of oxidation reaction of pyrites R Fe（Ⅲ） was 5. 30×10^-5～7. 51×10^-5mol/（L·min）. In the experimental scope,as with the tem- perature rose or the [Fe（Ⅲ）]i rose,the rate of oxidation reaction of pyrites increased. The relation between the rate and the temperature and [-Fe（Ⅲ）]i after regression analysis was obtained： the rate equation of oxidation reaction of pyrites was RFe（Ⅱ） = 5. 05×10^4 e^-45.54/HT [Fe（Ⅲ）-]i^0.6 , the oxidizing reaction activation energy was determined to be 45.54 kJ/mol. This value indicates the oxidation reaction of pyrites was controlled by the surface reaction,but not by proliferates.
基金
国家自然科学基金资助项目(50374001)
安徽省科技厅重点科研计划资助项目(04023047)
关键词
煤系黄铁矿
酸性矿井水
氧化反应动力学
pyrites from coal mine
kinetics of oxidation reaction
acid mine drainage（AMD）
