金矿尾渣固结体重金属浸出规律和水质评价  

Study on the Leaching Law of Heavy Metals in Consolidation of Gold Mine Tailings and Water Quality Evaluation

作　　者：龙声雨 王中美[1,2] 李鑫 王亮亮 杨燕妮 LONG Shengyu;WANG Zhongmei;LI Xin;WANG Liangliang;YANG Yanni(Key Laboratory of Karst Georesources and Environment of Ministry of Education,Guizhou University,Guiyang 550025,China;College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Liupanshui Municipal Planning and Design Research Institute Co.,Ltd.,Liupanshui 553001,China)

机构地区：[1]贵州大学喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025 [2]贵州大学资源与环境工程学院,贵州贵阳550025 [3]六盘水市规划设计研究院有限责任公司,贵州六盘水553001

出　　处：《环境科学与技术》2024年第2期60-67,共8页Environmental Science & Technology

基　　金：贵州大学实验室开放项目(SYSKF2022-111)。

摘　　要：以贵州某金矿尾渣固结体为研究对象,通过静态浸泡实验,分析尾砂直接浸泡以及固结养护不同时期(7、14、28 d)后浸出的重金属浓度变化情况。研究结果表明:(1)尾渣固结后浸出的重金属Ni、Cd、Sb的浓度比固结前更小,并且养护龄期越长,其浸出量越小;(2)尾渣直接浸泡所测的重金属浸出浓度值与浸泡时间进行函数拟合发现,离子的浸出最大浓度在达到平衡后分别为Ni 2.45μg/L、Cd 0.14μg/L、Sb 360.46μg/L,而Cu离子在此静态浸泡的过程中易饱和沉淀及再浸出,难以达到一个平衡量;(3)固结后尾渣浸出重金属Ni、Cd、Cu、Sb的浓度会最终达到一个平衡量,且随着固结养护龄期越长,各重金属离子浸出的最大浓度越小;(4)尾渣固结前后浸出的重金属浓度均使得水质为Ⅴ类水,但是尾砂固结后,水质整体得到了很大的改善,且养护龄期越长,对地下水水质改善的效果越明显。Taking the consolidated tailings of a gold mine in Guizhou as the research object,the changes of heavy metal concentration in tailings and different curing time of tailings after solidification were analyzed by the static immersion experiment.The results show that the leaching concentration of Ni,Cd and Sb of tailings after solidification is less than before solidification,and the longer the curing time,the less leaching.The results of fitting the leaching concentration of heavy metals and the soaking time showed that the maximum concentration of heavy metal ions leached after reaching equilibrium were Ni 2.45μg/L,Cd 0.14μg/L,Sb 360.46μg/L.After the tailings are solidified,the leaching concentration of Ni,Cd,Cu and Sb will reach equilibrium eventually,and the longer the curing time,the less maximum leaching concentration of heavy metal ions.Heavy metal leaching concentrations of the tailings of before and after the consolidation make the water quality satisfatory to ClassⅤcritiera,however,the water quality has been greatly improved after the tailings are consolidated.And the longer the curing time,the more obvious the effect of groundwater quality improvement.

关 键 词：金矿尾渣 固结养护 重金属 浸出规律 水质 

分 类 号：X523[环境科学与工程—环境工程]