不同酸度淋溶条件下石煤中Cd、Pb释放速率

Study on the release rate of Cd,Pb from stone coal under leaching conditions of different pH values

模拟天然降雨成分在三种酸度(pH 3.5、5.5和7.5)下对浙江省下寒武统荷塘组含钒石煤进行了淋溶作用实验,利用ICP-OES、ICP-MS等技术分析了滤出液中的Cd、Pb含量,研究了它们在不同酸碱度的淋溶条件下的释放特征。结果表明,石煤滤出液中Cd含量高低与淋滤液pH值的大小呈反比关系,在强酸性淋滤条件下滤出率为10.41%;Pb的滤出率为0.07%。上述结果为黑色岩系分布区土壤环境治理等提供了科学依据。

An experiment simulating natural acidity of rainfall was conducted for eluviations of the vanadium-bearing stone coal of Lower Cambrian Hetang Formation of Western Zhejiang at different pH values in the three components （3.5, 5.5 and 7.5）. The concentrations of heavy metals in filtrate were measured using inductively coupled plasma mass spectrometry （ICP-MS） and inductively coupled plasma optical emission spectrometer （ICP-OES） to study the release of Cd, and Pb at different acidity-alkalinity. The results showed that the concentrations of Cd in filtrate were inversely proportional to the pH value of leachate, and the leaching rates of Cd and Pb were 10.41% and 0.07%, respectively. These results have imlications for the environmental treatment in the distribution area of black rock series.