摘要
为研究粒径对不同地区煤矸石污染组分溶解释放规律的影响,以山西省和辽宁省3个煤矿区的4种煤矸石为试验材料,通过静态浸泡试验,分析了不同粒径、不同浸出时间条件下4种煤矸石浸出液的pH,氧化还原电位(ORP),电导率,总硬度,Fe^2+、Mn^2+、SO4^2-浓度等指标变化。结合X-射线衍射和扫描电子显微镜检测,阐明不同地区煤矸石污染组分溶解释放的机制。结果表明:在粒径为0.18~0.25 mm时,4种煤矸石释放的污染物量均达到较大值。阜新海州地区自燃煤矸石和海州地区原煤矸石的浸出液p H呈碱性,阜新高德地区自燃煤矸石和山西某矿原煤矸石的浸出液p H呈酸性。阜新高德地区自燃煤矸石浸出液的总硬度和SO24-质量浓度分别为589、529 mg/L,山西某矿原煤矸石浸出液的Fe2+质量浓度为10.79 mg/L,阜新海州地区自燃煤矸石浸出液的Mn2+质量浓度为1.97 mg/L。煤矸石的表面存在孔隙、附着细小颗粒,且包含的沸石、黄铁矿、绿泥石、高岭石和磁铁矿等矿物容易溶解,向水中释放污染物。煤矸石粒径越小污染物越容易溶解释放;浸出0~3 d内污染物容易溶解释放,后期释放量趋于平稳。建议矿区施工时保持煤矸石的粒径大于0.18~0.25 mm,以减少煤矸石在堆积和填充复垦过程中向土壤和地下水释放污染离子。
In order to study the dissolution and release laws of different types of coal gangue contaminated components under different particle size conditions. In this study,four kinds of coal gangue in three coal mining areas of Shanxi Province and Liaoning Province were used as experimental materials. The p H,ORP,Ec,total hardness,Fe^2+,Mn^2+,SO4^2-concentration of the four kinds of coal gangue leach liquids were analyzed by static immersion test under different particle size conditions and different leaching times. Combined with XRD and SEM,the mechanism of component dissolution interpretation of gangue pollution in different areas was clarified. The results showed that when the particle size is 0.18 ~ 0.25 mm,the pollutant quantity released by the four kinds of coal gangue reached a large value. The leaching solution of coal gangue from Haizhou open-pit mine is alkaline. The leaching solution of spontaneous coal gangue Leaching Solution in Gaode open-pit mine and original coal gangue from a coal mine in Shanxi Province was acidic. The total hardness and SO24-concentration of spontaneous coal gangue Leaching Solution in Gaode open-pit mine are 589 mg/L and 529 mg/L respectively. The Fe2+concentration of coal gangue Leaching Solution in Jincheng City is 10.79 mg/L. The Mn2+concentration of coal gangue Leaching Solution in Haizhou open-pit mine is 1.97 mg/L. There are pores and small particles on the surface of coal gangue. Within 0 ~ 3 d of leaching,the pollutants are easily dissolved and released. Then,with time,the release level stabilized. The minerals including zeolite,pyrite,chlorite,kaolinite and magnetite are easy to dissolve,releasing pollutants into the water. The smaller the particle size of gangue,the easier the pollutant is to dissolve and release. It is recommended to keep the size of coal gangue larger than 0.18 ~ 0.25 mm during the construction of the mining area to reduce the release of pollution ions to the soil and groundwater during the process of accumulation and filling and reclamation.
作者
狄军贞
鲍斯航
杨逾
孟凡康
王显军
郭旭颖
李振南
林鑫
董艳荣
DI Junzhen;BAO Sihang;YANG Yu;MENG Fankang;WANG Xianjun;GUO Xuying;LI Zhennan;LIN Xin;DONG Yanrong(College of Ciuil Enginering,Liaoning Technical University,Fuxin 123000,China;Faculty of Engineering,Univriti Putra Malaysia,UPM Serdang Selangor Darul Ehsan 43400,Malaysia;College of Science,Liaoning Technical University,F"uxin 123000,China;Sinosteel Anshan Research Institute of Thermo-energy Co,Ltd,Anshan 114044,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2020年第4期178-184,共7页
Coal Science and Technology
基金
国家自然科学基金面上资助项目(41672247,41102157)
辽宁省“兴辽英才”青年拔尖人才计划支持资助项目(XLYC1807159)。
关键词
煤矸石
粒径
污染物释放
矿区环境治理
oal gangue
particle size
pollutantsrelease environmental management of mining area
