煤气化炉渣免烧陶粒的制备及其在反硝化滤池中的应用  

Preparation of non⁃sintering coal gasification slag ceramsite and its application in denitrification filter

作　　者：张祎旸 武陈[1] 曹宗仑 王岽[1] 孙杰[1] ZHANG Yi-yang;WU Chen;CAO Zong-lun;WANG Dong;SUN Jie(Sinopec Beijing Research Institute of Chemical Industry,Beijing 100013,China)

机构地区：[1]中石化(北京)化工研究院有限公司,北京100013

出　　处：《现代化工》2024年第S01期213-217,共5页Modern Chemical Industry

摘　　要：煤气化炉渣是煤气化过程中产生的固体废弃物。大量的炉渣堆积不仅造成了资源的浪费,而且增加了企业的运营成本,对当地环境造成危害。以内蒙古地区的煤气化炉渣为主要原料,加入水泥、生石灰、CaSO_(4)等,通过免烧结的方式制备陶粒。在制气炉渣、水泥、生石灰、CaSO4质量比为70∶30∶2.5∶5的条件下制得的陶粒性能最优越,比表面积可达51.7 m^(2)/g,堆积密度为809 kg/m^(3),颗粒破碎强度为6.61 MPa。将该陶粒用作反硝化生物滤池填料,相比于普通市售陶粒挂膜速度更快;在水力停留时间(HRT)为12 h时,化学需氧量(COD)由300 mg/L下降至60 mg/L以下,COD去除率在80%以上;硝态氮(NO_(3)^(-)-N)由60 mg/L下降至2 mg/L以下,NO_(3)^(-)-N去除率在95%以上。利用煤气化炉渣制备免烧结陶粒实现了煤气化炉渣的资源化利用,同时为污水反硝化处理提供了一种新的填料。Coal gasification slag is a solid waste generated during the coal gasification process.Coal gasification slag generated in Inner Mongolia region,China is mixed with cement,quicklime and CaSO_(4)to prepare ceramsite through a non⁃sintering method.Result shows that the optimal raw materials mass ratio is coal gasification slag∶cement∶quicklime∶CaSO_(4)=70∶30∶2.5∶5.Specific surface area of non⁃sintered ceramsite prepared under this ratio can reach 51.7 m^(2)·g^(-1),bulk density is 809 kg·m^(-3),and particle crushing strength is 6.61 MPa.Using this ceramsite as a filler for denitrification biofilters results in a faster biofilm formation rate than using ordinary commercially available ceramsite.Chemical oxygen demand(COD)decreases from 300 mg·L^(-1)to below 60 mg·L^(-1),with a removal rate over 80%when the prepared ceramsite is used as fillers for denitrification biofilters and the hydraulic retention time(HRT)is 12 h.The content of nitrate nitrogen(NO_(3)^(-)⁃N)decreases from 60 mg·L^(-1)to below 2 mg·L^(-1),with a removal rate over 95%.This routine achieves re⁃utilization of coal gasification slag and provides a new filler for wastewater denitrification treatment.

关 键 词：煤气化炉渣 免烧结陶粒 填料 反硝化 除COD 除NO_(3)^(-)-N 

分 类 号：TU502[建筑科学—建筑技术科学]