电解锰渣地质聚合物路基利用时锰和氨氮的释放研究  

Study on the Release of Manganese and Ammonia Nitrogen from Electrolytic Manganese Residue-Based Geopolymers during Roadbed Utilization

作　　者：张曼颖 孟棒棒 岳波[1] 林晔 何莉莉 王涛 ZHANG Manying;MENG Bangbang;YUE Bo;LIN Ye;HE Lili;WANG Tao(Research Institute of Solid Waste Pollution Control Technology,Chinese Academy of Environmental Sciences,Beijing 100012,China;School of Municipal Administration and Environmental Engineering,Shenyang Jianzhu University,Shenyang,110168,China)

机构地区：[1]中国环境科学研究院固体废物污染控制技术研究所,北京100012 [2]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168

出　　处：《环境科学研究》2025年第3期653-661,共9页Research of Environmental Sciences

基　　金：贵州省科技计划项目(No.黔科合重大专项[2022]002);贵州省交通运输厅科技项目(No.2021-122-005)。

摘　　要：电解锰渣是电解生产金属锰时产生的酸性废渣,因为缺乏有效的管理手段,电解锰渣长期堆存处理,不仅占用土地、危害人体、污染环境,也造成资源的浪费,因此非常有必要研究电解锰渣的资源化利用。将电解锰渣制备成地质聚合物后,再结合水泥、粉煤灰、粒料按一定比例制备成无机结合料稳定材料基层(Inorganic binder stable material base,IBB),为了评估其作为路面基层的可行性,通过无侧限抗压实验研究其力学性能,并通过NEN7375水槽浸出实验对其特征污染物Mn^(2+)和NH_(4)^(+)-N的累积浸出规律、浸出行为及长期累积浸出量进行研究。结果表明:①随着电解锰渣地质聚合物掺量从5%增至25%,路面基层试块的压强先增大后减小,掺量为10%时试块压强最大,为17.80 MPa。②路面基层试块经64 d浸泡,Mn^(2+)和NH_(4)^(+)-N的累积浸出量变化趋势一致,前9 d累积浸出量增速较快,第9~60天累积浸出量增速放缓,60 d之后累积浸出量趋于稳定。在全浸出阶段,路面基层试块中Mn^(2+)的浸出行为均为冲刷作用,NH_(4)^(+)-N的浸出行为均为扩散控制。③二级动力学方程可以准确地对Mn^(2+)和NH_(4)^(+)-N的累积浸出量进行拟合。经预测,路面基层试块15年Mn^(2+)累积浸出量在2.19~12.84 mg/m^(2)之间,NH_(4)^(+)-N累积浸出量在0.05~0.29 mg/m^(2)之间。因此,若长期使用电解锰渣地质聚合物制备的路面基层,需要密切关注Mn2+的浸出风险。研究显示,电解锰渣地质聚合物制备的路面基层直接与地下水监测井接触时存在Mn^(2+)污染的环境风险,不存在NH_(4)^(+)-N污染的环境风险。建议进一步研究电解锰渣地质聚合物制备的路面基层中Mn^(2+)经土壤的吸附和地下水的稀释后到达地下水监测井的环境风险,或在源头上对电解锰渣地质聚合物中的Mn^(2+)进行进一步的去除,比如水洗,更加明确电解锰渣地质聚合物路基利用时不同应用场景的环Electrolytic manganese slag is the acidic waste residue produced during the electrolytic production of manganese metal.Due to the lack of effective management strategies,the long-term storage of electrolytic manganese slag not only occupies land,poses health risks,and pollutes the environment,but also leads to resource wastage.Therefore,it is essential to study the resource utilization of electrolytic manganese slag.In this study,electrolytic manganese slag is processed into geological polymer,combined with cement,fly ash and an inorganic binder stable material base(IBB),to evaluate its feasibility as a pavement base.The mechanical properties were examined through unconfined compressive strength tests,while the cumulative leaching behavior and long-term accumulation of the characteristic pollutants Mn^(2+) and NH_(4)^(+)-N were studied using the NEN7375 tank leaching experiment.The results show that:(1)As the mass polymer content of the electrolytic manganese slag increases from 5%-25%,the compressive strength of the pavement base test block initially increases and then decreases,with the maximum strength of 17.80 MPa observed at a 10%dosage.(2)After 64 days of immersion,the cumulative leaching of Mn^(2+) and NH_(4)^(+)-N followed a similar trend.The cumulative leaching volume increased rapidly during the first 9 days,slowed down from 9 to 60 days,and stabilized after 60 days.During the full leaching stage,the leaching behavior of Mn^(2+)in the pavement base test block was governed be a scouring effect,while the leaching behavior of NH_(4)^(+)-N was controlled by diffusion.(3)The cumulative leaching amounts of Mn^(2+) and NH_(4)^(+)-N were accurately fitted by second-order kinetic equations.It is predicted that the cumulative leaching of Mn^(2+) after 15 years will range from 2.19 to 12.84 mg/m^(2),while the cumulative leaching of NH_(4)^(+)-N will range from 0.05 to 0.29 mg/m^(2).The study indicates that the risk of Mn^(2+) pollution persists when the pavement base,prepared with electrolytic manganese slag,direc

关 键 词：电解锰渣 累积浸出量 浸出行为 长期累积浸出量预测 

分 类 号：X705[环境科学与工程—环境工程]