煤田地质与勘探2023，Vol.51Issue(12)：176-184,9.DOI:10.12363/issn.1001-1986.23.05.0238
淮南潘一矿煤基固废精细化学结构及重金属生态风险评价
Coal-based solid waste from the Panyi Mine in the Huainan mining area:Fine-scale chemical structure and ecological risk assessment of heavy metals
摘要
Abstract
The utilization of clean coal-based solid waste is a pressing issue in the ecological construction of mining areas.To address this issue,the key is to ascertain the structures and morphology of heavy metals in coal-based solid waste.This study investigated the coal gangue and fly ash samples from the Panyi Mine in the Huainan mining area,An-hui Province.First,this study characterized the coal-based solid waste using microanalysis methods,such as X-ray fluor-escence spectrometry(XRF),X-ray diffraction(XRD),scanning electron microscopy(SEM),and Fourier transform in-frared spectroscopy(FTIR).Then,it examined the fine-scale chemical structure and heavy metal dissemination modes of coal-based solid waste.Finally,this study assessed the potential ecological risks of heavy metals by combining the risk assessment code(RAC).The key findings are as follows:(1)The coal gangue,dominated by clay particles(0-5 μm)and coarse-grained silts(10-50 μm),exhibits irregular particle sizes and large spatial distribution spacings.Its main mineral is quartz(SiO2),with the bending vibrations of AlO4 and SiO4 presence in its infrared(IR)spectra.In contrast,the fly ash,dominated by coarse-grained silts(10-50 μm)and sandy gravels(50-250 μm),manifests spherical inclusions and porous particles on the surface,varying in particle size.Its main mineral is mullite(Al6Si2O13),with symmetric and anti-symmetric stretching vibrations of Si-O-Si within organosilicon present in its IR spectra.(2)In the coal gangue,Ni and Pb are primarily organic bound or bound to Fe-Mn oxides,while Cr,Cd,and As predominantly occur in the residual form.In the fly ash,As principally occurs in residual and organic bound forms,while other heavy metals occur in the re-sidual form.(3)As indicated by the RAC-based ecological risk assessment,Cr and As in both coal gangue and fly ash are at a low risk level,and other heavy metals in them do not pose a risk.The results of this study hold practical signific-ance for the reutilization of coal-based solid waste and the eco-environmental protection of mining areas.关键词
潘一矿/煤基固废/精细化学结构/重金属/生态环境/风险评价/淮南Key words
Panyi Mine/coal-based solid waste/fine-scale chemical structure/heavy metal/eco-environment/risk as-sessment/Huainan Province分类
天文与地球科学引用本文复制引用
殷文文,张理群,丁丹,单士锋,陈永春,安士凯,郑刘根..淮南潘一矿煤基固废精细化学结构及重金属生态风险评价[J].煤田地质与勘探,2023,51(12):176-184,9.基金项目
安徽省高校协同创新项目(GXXT-2021-017) （GXXT-2021-017）
国家自然科学基金项目(42072201) （42072201）
安徽省绿色矿山工程研究中心开放基金项目(CXY-2023-0101) （CXY-2023-0101）
