煤及其燃烧产物中环境敏感元素淋滤的迁移行为研究  

Study on migration behavior of environmental sensitive elements in coal and its combustion products

作　　者：孙雷[1] 王真真 Sun Lei;Wang Zhenzhen(Anhui Institute of Environmental Sciences,Hefei 230022,China;College of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽省环境科学研究院,安徽合肥230022 [2]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《能源与环保》2021年第8期1-5,共5页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金面上项目(41972166)。

摘　　要：以两淮煤田不同时代的3个主采煤层及其燃煤产物为研究对象,选取As环境敏感元素,采用自行组装的淋滤实验装置,研究了As元素在3种不同酸碱度的淋滤液和4个不同时间段的淋滤特性。研究结果表明:As元素随着淋滤液酸性的增加,元素淋出率随淋滤时间延长均有所增高。相对于原煤,燃煤灰中As元素的淋出率均高于原煤。在淋滤时间方面,一般随着淋滤时间的增加,煤中有害元素的淋出率整体呈不断增大的趋势,淋出率在30 h之前显著增大。在酸性较弱(pH值为4和7)的环境下,煤中有机质对As元素淋滤迁移行为的影响表现为镜质组含量的差异;在酸性较强(pH值为2)的环境下,煤中有机质对As元素淋滤迁移行为的影响表现为惰质组和壳质组含量的差异。As元素的最大溶出浓度小于地面水中有害元素最高允许浓度,具有潜在环境污染效应。Taking the three main coal seams and their coal-burning products of the Huainan-Huaibei Coalfield in different eras as the research object,selecting As environmentally sensitive elements,using a self-assembled leaching experiment device,the As element was studied in three different pH leaching and leaching characteristics in 4 different time periods.The results of the study showed that as the acidity of the leaching solution increased,the leaching rate of the element increased with the extension of the leaching time.Compared with raw coal,the leaching rate of As element in coal ash was higher than that of raw coal.In terms of leaching time,generally with the increase of leaching time,the overall leaching rate of harmful elements in coal was increasing,and the leaching rate increases significantly before 30 h.In a weakly acidic environment(pH values of 4 and 7),the influence of organic matter in coal on the leaching and migration behavior of As elements was manifested as a difference in vitrinite content;in a more acidic environment(pH value of 2),the influence of organic matter in coal on the leaching and migration behavior of As element was manifested as the difference in the content of inert and chitin.The maximum dissolved concentration of As element was less than the maximum allowable concentration of harmful elements in ground water,which had potential environmental pollution effects.

关 键 词：两淮煤田 敏感元素 燃烧 淋滤 迁移行为 

分 类 号：X752[环境科学与工程—环境工程]