汞矿区尾矿渣的淋滤特征研究

摘要

通过对比不同初始 pH 值的淋滤液中各重金属元素的含量，以及随着淋滤实验的进行重金属淋出量的变化趋势，研究尾矿中重金属淋出量跟淋滤液初始 pH 值之间的关系。结果显示：不同的样品中的某种元素存在最佳的淋滤液初始 pH 值，即在某种特定的初始 pH 值的淋滤下，该种元素能最大限度的被淋出。As、Pb 两种元素更容易在酸性条件下发生迁移，而 Cr 元素则更容易在中性环境下淋出。此外，大多数元素能在前两次淋滤中大量淋出，获得极大值或者最大值，由于实验次数的限值在后期并未出现稳定的变化规律。%By comparing the contents of heavy metal elements in leaching liquor with different initial pH values,we know the trend of heavy metal leaching with leaching experiments,the relationship between the leaching amount of heavy metals and the initial pH value of leaching solution relationship.The results show that there is an optimum initial pH value of leaching solution in a certain sample in different samples.The element can be leached out to the maximum extent under the leaching of a certain initial pH value.The factors (As and Pb)are more likely to migrate under acidic conditions while Cr is more likely to leach out in a neutral environment.In addition,most of the elements in the first two leaching is a large number of leaching to obtain maximum or maximum.We think the number of experiments in the late limit does not appear to be stable changes in law.