基于地聚物体系的电解锰渣污染物的溶出风险及固化机理

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摘要为降低电解锰渣(EMR)的潜在环境风险,采用了地质聚合反应对其进行固化稳定化处理,通过浸出毒性试验和BCR连续提取法试验确定电解锰渣基地聚物(EMRGP)的溶出风险,并借助于XRF、XRD、SEM-EDX和XPS等表征手段对固化机理进行探究.结果发现,EMRGP浸出液中的Mn²⁺和NH₄⁺浓度仅为0.005mg/L和0.996mg/L,满足相关标准的排放和再利用要求.BCR连续提取法试验结果显示EMRGP的溶出风险较低.在固化稳定化过程中,生成了硅铝凝胶,NH₄⁺以NH₃挥发或以鸟粪石被沉淀,Mn²⁺除被氧化成Mn³⁺和Mn⁴⁺外,还与其余重金属元素一同以氢氧化物沉淀形式,或以被硅铝凝胶吸附包裹的形式固定.这一方法显著减轻了EMR的潜在环境风险.

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	刘博
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关键词 ：电解锰渣, 地聚物, 固化稳定化, 硅铝凝胶, 机理

Abstract：In order to mitigate the potential environmental risks associated with electrolytic manganese residue (EMR), a geological polymerization reaction was employed to carry out its solidification and stabilization. Through leaching toxicity tests and consecutive BCR extraction experiments, the leaching risk of electrolytic manganese residue-based polymer (EMRGP) was ascertained. Characterization techniques such as XRF, XRD, SEM-EDX, and XPS were utilized to investigate the solidification mechanism. The results revealed that the concentrations of Mn²⁺ and NH₄⁺ in the leachate from EMRGP were merely 4.64μg/L and 0.99mg/L, meeting the standards for discharge and reutilization. BCR continuous extraction experiments showed a lower leaching risk for EMRGP. During the solidification and stabilization process, the formation of silica-alumina gel occurred. NH₄⁺ either volatilized as NH₃ or precipitated as struvite, while Mn²⁺, apart from being oxidized to Mn³⁺ and Mn⁴⁺, concomitantly precipitating with other heavy metal species in the guise of hydroxide precipitates or enshrouded within the protective vestiges of silico-aluminous gels. This approach significantly alleviated the potential environmental risk associated with EMR.

Key words： electrolytic manganese residue geopolymer solidification and stabilization silicon-aluminum gel mechanism

收稿日期: 2023-05-11

PACS:

X757

基金资助:贵州省交通运输厅科技项目(2021-122-005);广西典型电解锰渣资源化路用环境风险评估项目

通讯作者: 岳波,研究员,yuebo@craes.org.cn E-mail: yuebo@craes.org.cn

作者简介: 刘博(1997-),男,河南商丘人,昆明理工大学硕士研究生,主要从事固体废物污染防治研究.发表论文5篇.1014501187@qq.com.

引用本文:

刘博, 何莉莉, 岳波, 孟棒棒, 王涛, 高红. 基于地聚物体系的电解锰渣污染物的溶出风险及固化机理[J]. 中国环境科学, 2023, 43(12): 6465-6473. LIU Bo, HE Li-li, YUE Bo, MENG Bang-bang, WANG Tao, GAO Hong. Leaching risk and solidification mechanisms of electrolytic manganese residue pollutants based on the geopolymer system. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6465-6473.

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