碳酸盐岩区硫化物尾矿中重金属赋存状态研究

项目名称： 碳酸盐岩区硫化物尾矿中重金属赋存状态研究

项目编号： No.41272394

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 雷良奇

作者单位： 桂林理工大学

项目金额： 84万元

中文摘要： 本项目以桂北及相邻碳酸盐岩地区的有色金属矿山碳酸盐型尾矿作为研究对象。在尾矿剖面层带组构分析的基础上，采用Dold化学提取法、Sobek-ABA(acide-base accounting酸-碱估算)法和NAG（net acid generation净产酸量）测试法，以及元素地球化学、次生矿物学等研究方法，研究碳酸盐型尾矿中重金属（Pb、Zn、Cd及As）的赋存化学形态、稳定性及其影响因素（尾矿组构、氧化作用、酸化作用和次生矿物吸附作用等）；以及，厘定尾矿重金属复合污染评价预测指标（重金属背景值、活性内梅罗指数、迁移性及迁移率），结合柱淋滤和密闭浸泡实验，深入了解碳酸盐型尾矿中重金属的赋存状态和稳定性及其环境效应；建立碳酸盐岩地区有色金属矿山尾矿重金属复合污染的综合评价预测系统，为喀斯特环境景观区金属硫化物尾矿源重金属复合污染的防治提供依据。

中文关键词： 重金属；元素赋存状态；污染评价；碳酸盐型尾矿；有色金属矿山

英文摘要： This project will focus on the carbonate-rich sulfide tailings in karst region in northern Guangxi province and its adjacent areas (south China). Based on analyzing the lamellar fabrics of the tailings profile, and using the methods such as Dold chemical extraction, Sobeck-ABA (acid-base accounting) and NAG (net acid generation) test, and element geochemistry and secondary mineralogy, as well as carring out the collumn leach test and the acid water soak test, this project will investigate into the chemical speciation distribution and stability of heavy metals (Pb, Zn, Cd and As) in the tailings, and the affecting factors (e.g. tailings fabrics, oxidation, acidification and secondary mineral adsorption）involving the heavy metals occurrence and stability in the tailings; and determine the assessment/prediction measures (e.g. heavy metals background values, active Nemerow index, mobility and transport ratio) of heavy metal combinative pollution. The study could expect to achieve the goals of: ①deeply understanding the behavior and environment effect of heavy metals in carbonate type tailings; ②building an assessment/predict system of heavy metals combinative pollution deriving from the tailings of non-ferrous metals mines in karst environment landscape region.

英文关键词： heavy metals；elements occurrence state；pollution assessment；carbonate rich sulfide tailings；nonferrous metals mine