摘要
云南金顶铅锌矿是中国较为典型的高镉铅锌矿区之一。通过模拟常温条件下天然雨水的自然淋滤过程,对矿区两个典型的富镉氧化矿石样品进行了长时淋滤实验研究。初步结果表明:随着淋滤时间的延长,滤液中pH值(pH=7.2～8.5)和SO42-浓度无显著变化。滤液中Cl-离子浓度随时间呈显著增大趋势。溶解态镉和其它主要元素铅、锌、铜和锰质量浓度变化随时间呈降低趋势。铅锌氧化矿石易淋出而释放出镉等有害元素,滤出元素可以迅速发生沉淀或被沉淀物包裹,其能力表现为Zn>Pb>Cd。两个不同矿石镉的淋失量有所差别,矿石中菱锌矿质量分数是影响镉淋失的主要因素。矿区富镉岩石和矿物的自然风化对矿区流域水生态环境造成潜在危害。
The Jinding Pb-Zn deposit in Yunnan is a typical high Cd-rich area in China. A long time leaching experiments about two Cd-rich oxidied ore were conducted at ambient temperature through simulating rainfall. The results show pH values （pH=7.2～8.5） and SO4^2- concentrations of leachate tread to stabilization with increasing leaching time.The Cl^- concentration of leachate increases markedly. The soluble Cd,Pb,Zn,Cu and Mn concentration distribution vary with adverse decreasing. The release of cadmium in both oxidized ore exixits remarkable difference,and is probably affected by the main factor of smithsonite component content in ore. The leaching test shows that Pb/Zn ore are susceptibly to be oxidized or dissolved and readily release Cd and other harmful element. These leached elements in the leachate may deposit rapidly,and the depositing rank presents Zn〉Pb〉Cd. The natural weathering of Cd-rich rock and mineral presents potential environment risk for the aquatic ecosystem of Jinding catchment.
出处
《生态环境》
CSCD
北大核心
2007年第4期1121-1124,共4页
Ecology and Environmnet
基金
中国科学院"西部之光"项目
国家自然科学基金项目(40373021)
关键词
镉
淋滤实验
环境影响
金顶铅锌矿
cadmium
environmental geochemistry
environmental effect
Jinding Pb-Zn deposit
