摘要
金属矿废石暴露在自然环境中易产生酸性污染物、释放重金属离子,对周边环境造成严重污染。鉴于其污染的长期性,有必要对废石产酸规律及释放重金属离子行为进行研究。以江西省某铜矿废石为对象,通过动态淋溶试验研究了淋溶液p H值、废石粒度、淋溶强度(淋溶液流速)等因素对产酸及释放重金属离子的影响。结果表明,淋溶液p H值与SO_4^(2-)产生量及Cu、Pb的释放量负相关,淋溶液p H值越低,SO_4^(2-)、Cu、Pb的累计释放量越大;而Zn呈现不同规律,淋溶液p H值为5时其累计释放量高于淋溶液p H值为3时,表明Zn在弱酸性环境中更易释放溶出。废石粒径越小,越有利于产酸和释放重金属离子,细粒径废石淋溶体系内SO_4^(2-)、Cu、Pb、Zn累计释放量显著高于粗粒径废石。淋溶液流速与SO_4^(2-)产生量及重金属离子的释放量正相关,在高淋溶液流速(1.02m L/min)、低初始淋溶液p H值(3)、细粒径废石(0.15~0.25mm)淋溶体系中,SO_4^(2-)、Cu、Pb、Zn累计释放量分别可达1389.55mg/kg、310.18μg/kg、413.18μg/kg和281.62μg/kg。研究结果可以为类似有色金属矿山废石的产酸和释放重金属离子行为及污染治理提供指导。
Metal mine waste rock exposed to the natural environment is easy to produce acidic pollutants and release heavy metal ions,causing serious pollution to the surrounding environment.In view of the long-term nature of its pollution,it is necessary to study the acid production law of waste rock and the behavior of releasing heavy metals ions.A copper mine waste rock in Jiangxi Province was taken as the object,and the influence of factors such as the pH value of the leaching solution,the particle size of the waste rock,and the intensity of leaching(drench solution flow rate)on the acid production and the release of heavy metals ions was investigated through the dynamic leaching test.The results showed that the pH value of the drenching solution was negatively correlated with the amount of SO_(2)-4 production and the release of Cu and Pb,and the lower the pH value of the drenching solution was,the greater the cumulative release of SO_(2)-4,Cu and Pb.In contrast,Zn showed a different trend,and its cumulative release was higher at a drenching solution pH of 5 than that at a drenching solution pH of 3,which indicated that Zn was more likely to be released from the drenching solution in a weakly acidic environment.The smaller the particle size of waste rock,the more favorable to waste rock acid production and release of heavy metals ions,fine particle size waste rock leaching system in the SO_(2)-4,Cu,Pb,Zn cumulative release of up to the coarse particle size waste rock.The drench solution flow rate was positively correlated with SO_(2)-4 production and heavy metal ions release,and the cumulative releases of SO_(2)-4,Cu,Pb and Zn could reach 1389.55 mg/kg,310.18μg/kg,413.18μg/kg and 281.62μg/kg,respectively,in the system of drenc-hing with a high drench solution flow rate(1.02 mL/min),a low initial pH of drench solution(3),and a fine-sized waste rock(0.15~0.25 mm).The results of the study can provide guidance for the behavior of acid production and release of heavy met-als ions from waste rock of the similar non-ferrous metal mines and pollution management.
作者
马童麟
董颖博
林海
昝金雨
MA Tonglin;DONG Yingbo;LIN Hai;ZAN Jinyu(School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants,Beijing 100083,China)
出处
《金属矿山》
CAS
北大核心
2024年第1期276-284,共9页
Metal Mine
基金
“十三五”国家重点研发计划项目(编号:2019YFC1805001)
矿物加工科学与技术国家重点实验室开放基金项目(编号:BGRIMMKJSKL-2022-07)。
关键词
铜矿废石
动态淋溶
产酸
重金属
释放规律
copper mine waste rock
dynamic leaching
acid production
heavy metals
leaching law
作者简介
马童麟(2000-),女,硕士研究生。;通信作者:董颖博(1983-),女,教授,博士,博士研究生导师。
