酸雨对煤中砷、汞的淋滤特征及分布规律的影响

针对东北某地待开发的2号钻孔煤、820℃灼烧底灰及煤矸石为淋滤实验对象，详细研究了酸雨类型、酸雨酸度、酸雨降雨量对砷、汞的淋出特征及分布规律。结果表明：砷由于其惰性，在原煤及底灰中均淋不出，矸石中淋出率也不高。汞在原煤中淋出率不大于l％，但在底灰中活性很强，在10h内，去离子水的淋出率为54．58％，硫酸型和硝酸型酸雨可将底灰中汞全部淋出；砷、汞在煤矸石中淋滤规律为：洗矸〉矸石山〉顶板，酸雨强度表现为低酸雨强度时对砷、汞有最大淋出；酸雨雨量的增大会导致矸石中汞的淋出成倍增加。

Research on leaching characters and precipitation regularity of As and Hg leached by acid rain

Take No. 2 drilling coal, coal gangue and burned ash at 820 ℃ in somewhere of northeast as subjects of leaching experiment. The precipitation regularity of As and Hg were effected by different types,acidity, rainfall of acid rain . The results show that As in coal,ash cant be leached ,so as the coal gangue,for As is inertial. Hg in coal is leached less than 1% ,but in ash,Hg is activity,in 10 hour,it is leached by deionized water at 54.58%. Hg in ash can be all leashed by Sulfuric acid and nitric acid. The precipitation regularity of As and Hg in coal refues is that,Xi gan 〉 Gan shi shah 〉 Ding ban ; the consistency of acid fall is less, the leaching of Hg and As is more ; when rainfall is heavier,leaching of Hg in coal gangue will doubting increase.