As污染土壤制备烧结砖影响因素及环境安全性研究  

Study on the Influencing Factors and Environmental Safety of Sintered Bricks Made by As Contaminated Soil

作　　者：黄海 岳龙凯 张靖其 於进 尹立普 HUANG Hai;YUE Longkai;ZHANG Jingqi;YU Jin;YIN Lipu(China State Science Dingshi Environmental Engineering Co.Ltd.,Beijing 100102)

机构地区：[1]中科鼎实环境工程有限公司,北京100102

出　　处：《环境卫生工程》2024年第3期71-77,共7页Environmental Sanitation Engineering

基　　金：国家重点研发计划项目(2019YFC1803905)。

摘　　要：重金属污染土壤烧结过程的影响因素和烧结产品环境安全性是其资源化利用的重要问题,基于此,以广州(GZ)、长沙(CS)、苏州(SZ)和淄博(ZB)等区域As污染土壤为原料开展烧结制砖资源化利用的模拟研究。结果表明:抗压强度随烧结温度升高(900~950℃)提升了7.9%~382.9%;土壤机械组成不同会导致烧结砖抗压强度差异显著(P<0.01);添加5%Na_(2)CO_(3)+5%Al_(2)O_(3)不仅能将GZ土壤烧结砖抗压强度提高0.6~4.1倍,同时烧结砖中As浸出浓度降低88.4%~98.8%,烧结过程As的挥发量降低99.3%。扫描电子显微镜(SEM)和X射线衍射(XRD)结果表明,烧结过程中添加Na_(2)CO_(3)和Al_(2)O_(3)等化合物会导致土壤矿物变化,可对烧结过程产生的片层间隙起到填充、封堵和包裹等多重作用,从而显著降低As浸出浓度和挥发量。The factors affecting the sintering process of heavy metal contaminated soil and the environmental safety of sintering products are important issues for its resource utilization.Based on this,a simulation study on the resource utilization of sintered brick was carried out with As contaminated soil in Guangzhou(GZ),Changsha(CS),Suzhou(SZ)and Zibo(ZB)as raw material.The results indicated that the compressive strength of sintered bricks increased from 7.9%to 382.9%when sintering temperature increased from 900℃to 950℃.The difference of soil mechanical composition leaded to significant difference in compressive strength of sintered bricks(P<0.01).The addition of 5%Na_(2)CO_(3) and 5%Al_(2)O_(3) could not only increase the compressive strength of the GZ soil sintered brick by 0.6 to 4.1 times,but also reduce the leaching concentration of As in the sintered brick by 88.4%to 98.8%,and the volatilization of As in the sintering process was reduced by 99.3%.Scanning Electron Microscope(SEM)and X-Ray Diffraction(XRD)results showed that the addition of compounds such as Na_(2)CO_(3) and Al_(2)O_(3) during sintering could lead to soil mineral changes,and could play multiple roles in filling,sealing and wrapping the lamellae gaps generated during sintering,thus significantly reduced the leaching concentration and volatilization of As.

关 键 词：As污染土壤 烧结砖 抗压强度 环境安全性 

分 类 号：X53[环境科学与工程—环境工程]