摘要
铁尾矿中重金属的迁移转化会对环境构成长期威胁,矿物学因素与尾矿中重金属的稳定性密切相关.本研究以广东某多金属铁尾矿为研究对象,采用自动矿物解离分析仪(MLA)、连续提取和模拟浸出试验,从矿物学角度揭示了尾矿中有害金属释放的潜在影响因素.结果表明,褐铁矿(59.56%)和赤铁矿(22.15%)等含铁矿物为主要矿物相,与重金属矿物连生关系复杂.在模拟浸出中,铅和锰在酸雨、植物吸收和人体吸收等情境下释放潜力较高,尤其是细粒部分,分别含有46.98%和43.26%的潜在可利用态.含铅、锰的主要矿物为水磷铁铅石、砷铅铁矿和硬锰矿.褐铁矿对锌和铜的固定起关键作用,超过90%的锌和铜以类质同象的形式被束缚于褐铁矿中,限制其迁移浸出.本研究结果为库区铁尾矿污染控制和风险管理提供了重要依据.
The migration and conversion of heavy metals in iron tailings pose a long-term environmental threat,with mineralogical factors tightly related to the stability of these metals in tailings.A polymetallic iron tailing from Guangdong was utilized to investigate the potential factors influencing the release of hazardous metals from the tailing at a mineralogical scale through the application of an automatic mineral liberation analyzer(MLA),sequential extraction,and simulated leaching tests.The results revealed that iron-bearing minerals,such as limonite(59.56%) and hematite(22.15%),constituted the primary mineral phases,exhibiting complex associations with heavy metal minerals.In simulated leaching experiments,Pb and Mn exhibited higher release potential under scenarios including acid rain,plant uptake,and human absorption,particularly in the fine-grained fraction,which contained 46.98% and 43.26% of potential availability,respectively.The primary minerals containing Pb and Mn were drugmanite,carminate,and psilomelane.Limonite played a critical role in fixation of Zn and Cu,with over 90% of these metals being bound in limonite in a homogeneous form,thereby restricting their migration and leaching.The findings of this study provide a significant foundation for pollution control and risk management strategies pertaining to iron tailings in storage ponds.
作者
邓金环
宁寻安
邱国强
张鼎元
崔喜庆
叶文盛
彭岱
王逸
DENG Jinhuan;NING Xun′an;QIU Guoqiang;ZHANG Dingyuan;CUI Xiqing;YE Wensheng;PENG Dai;WANG Yi(School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006;Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control,Guangzhou 510006)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第5期457-465,共9页
Acta Scientiae Circumstantiae
基金
广东省自然科学基金(No.2024A1515010315)
2017年土壤中央专项资金资助项目(No.18HK0108)。
关键词
铁尾矿
矿物学
有害金属
矿物解离
释放潜能
iron tailings
minerology
hazardous metals
mineral liberation
release potential
