摘要
针对桂北铅锌尾矿中重金属在水平方向上的释放、迁移和转化问题,利用尾矿为研究对象,通过降雨模拟装置进行径流冲刷试验,分析冲刷过程中尾矿重金属浓度和形态的变化。结果表明,在径流冲刷过程中,尾矿中重金属浓度整体呈下降趋势,深度对尾矿中重金属浓度变化的影响不明显,同一深度的尾矿,粒径与其重金属释放量呈负相关关系,粒径小于75μm时重金属Zn减少率高达24%。径流作用下,尾矿的粒径大小与迁移能力成反比。径流冲刷前后,尾矿中重金属含量下降,Cd,Zn和Pb的含量在弱酸提取态下分别减少2.4%,1.6%和0.3%。随降雨时间延长,液相可溶态重金属浓度未发生显著变化,固相颗粒态重金属浓度持续降低,液相颗粒态重金属含量减少最明显。
In order to solve the problem of the release,migration and transformation of heavy metals in the horizontal direction of lead and zinc tailings in Northern Guangxi,the tailings are used as the research object,runoff erosion experiment is carried out by simulated rainfall,to analyze the changes of heavy metal concentration and morphology in tailings during the process of scouring. The results showed that the concentration of heavy metals in tailings decreased during runoff,the effect of depth on the change of heavy metal concentration in tailings is not obvious,the same depth of tailings,tailings size and its heavy metal release is negatively correlated,The reduction rate of heavy metal zinc（Zn） in tailings with particle size less than 75 μm is as high as 24%,Under the action of runoff,the size of the tailings is inversely proportional to the migration capacity. The contents of heavy metals in tailings decreased before and after runoff,the contents of Cd,Zn and Pb decreased by 2. 4%,1. 6% and 0. 3%,respectively. With the increase of rainfall time,the concentration of heavy metals in the liquid phase did not change significantly,and the concentration of heavy metal in the solid phase decreased continuously,and the heavy metal content in the liquid phase decreased most obviously.
作者
丰顺
舒小华
艾涛
刘杰
FENG Shun;SHU Xiaohua;AI Tao;LIU Jie(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology Guilin , Guangxi 541004)
出处
《工业安全与环保》
2018年第4期83-88,共6页
Industrial Safety and Environmental Protection
基金
广西科技研究与技术开发重大专项(14124001-4)
关键词
尾矿
径流冲刷
重金属浓度
迁移转化
tailings runoff concentration of heavy metal migration and transformation
