摘要
该文以典型锡矿区——云南个旧卡房锡尾矿库为研究对象,采用静态浸泡和动态淋溶,结合实验前后尾矿矿物、微观形貌变化探究锡尾矿中As、Mn在降雨淋溶和长期浸泡条件下的释放特征。结果表明:降雨淋溶和长期浸泡会造成尾矿中As、Mn的明显释放。随着固液比的降低,浸泡液中As、Mn浓度呈下降趋势;高固液比会延长As的释放周期,而Mn则相反;锡尾矿中碱性矿物占比高,酸中和能力强,浸泡液、模拟酸雨p H对尾矿中As和Mn的释放影响较小;重金属释放模型的拟合结果表明,尾矿中As的释放符合二级动力学方程,Mn的释放符合二级动力学方程和双速率方程。
In attempting to study As and Mn release from the wastewater of a tin-tailing pond in Gejiu City of Yunnan Prov⁃ince on the condition that the tin tailing have undergone rainfall leaching and long-term soaking,a static immersion and dynamic leaching experiment was conducted focusing on the changes of tailing mineral and micro-morphology.Conse⁃quently,the experiment revealed that rainfall leaching and long-term soaking would cause the significant release of As and Mn,and with a decrease of the solid-liquid ratio,the concentrations of As and Mn in the soaking solution tended to de⁃cline;a high solid-liquid ratio would extend the release cycle of As,but to Mn that was on the contrary.Since the constituent of alkaline minerals was rather high,the capacity of acid-neutrization appeared strong,the effect of initial pH value of sim⁃ulated rainfall leaching water or soaking water on the release of As and Mn was small.In regard to the model fitting of heavymetal release,it was showed that the release of As in tin tailing fit the second-order kinetic equation,while Mn release fit the second-order kinetic equation and two-rate equation.
作者
邓凯沣
杨熙斌
黄小凤
杨帆
龙雨欣
唐银香
王宇
DENG Kaifeng;YANG Xibin;HUANG Xiaofeng;YANG Fan;LONG Yuxin;TANG Yinxiang;WANG Yu(Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China;National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries,Kunming 650500,China;Huaneng Lancang River Hydropower Inc,Kunming 650214,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2024年第6期18-26,共9页
Environmental Science & Technology
基金
国家重点研发计划项目(2018YFC1801701)。
关键词
环境学
锡尾矿
砷
锰
释放特征
environmental studies
tin tailing
arsenic(As)
manganese(Mn)
release characteristic
