城市生活垃圾焚烧飞灰协同底渣制备轻质低硅铝型陶粒实验研究  

Experimental study on preparation of lightweight low-silicon-aluminum ceramsite from municipal solid waste incineration fly ash in conjunction with bottom ash

作　　者：张东帅 王进[1,2] 岳正波 吴建勋[3] 杨永浩 詹欣源 ZHANG Dongshuai;WANG Jin;YUE Zhengbo;WU Jianxun;YANG Yonghao;ZHAN Xinyuan(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei Anhui 230009;Anhui Engineering Research Center of Industrial Wastewater Treatment and Resource Recovery,Hefei Anhui 230009;East China Electric Power Design Institute Co.,Ltd.of CPEEC,Shanghai 200063;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074;East China Engineering Science and Technology Co.,Ltd.,Hefei Anhui 230022)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]安徽省工业废水处理与资源化工程研究中心,安徽合肥230009 [3]中国电力工程顾问集团华东电力设计院有限公司,上海200063 [4]重庆交通大学土木工程学院,重庆400074 [5]东华工程科技股份有限公司,安徽合肥230022

出　　处：《环境污染与防治》2024年第1期32-37,共6页Environmental Pollution & Control

基　　金：国家自然科学基金青年科学基金项目(No.52100139);安徽省博士后研究人员科研活动资助项目(No.2022B593);中央高校基本科研业务费专项资金资助项目(No.JZ2023HGTB0266)。

摘　　要：以城市生活垃圾焚烧飞灰(简称飞灰)协同城市生活垃圾焚烧底渣(简称底渣)制备轻质低硅铝型陶粒,研究飞灰/底渣掺量、焙烧条件对陶粒性能的影响,分析热处理后矿物相转变、微观形貌,并从重金属浸出角度评估成品陶粒的质量。结果表明:(1)在最佳原料掺量(质量分数)为飞灰20.0%、底渣40.0%、凝灰岩40.0%,最佳焙烧参数为预热温度500℃、焙烧温度1100℃、焙烧时间10 min的条件下,陶粒的颗粒强度为2014 N,堆积密度为890 kg/m^(3),1 h吸水率为8.60%。(2)焙烧过程中生成了新物相(透辉石、钙铁辉石和硅灰石),并且陶粒内部形成了丰富的多孔结构。(3)陶粒中Cr、Ni、Zn、As、Cd、Pd浸出毒性远低于《污水综合排放标准》(GB 8978—1996)。Municipal solid waste incineration fly ash and municipal solid waste incineration bottom ash were co-disoposed for preparing lightweight low-silicon-aluminum ceramsite,effects of fly ash/bottom ash dosage and roasting conditions on the properties of ceramsite were studied,the phase transformation of minerals and the micro-morphology after thermal treatment were analyzed and the quality of the resulting product in terms of the leaching of heavy metals was assessed.The results showed that:(1)the optimal synthetic condition of lightweight ceramsite was a raw material ratio of 20.0%fly ash,40.0%bottom ash,40.0%tuff,preheating temperature of 500℃,roasting temperature of 1100℃and roasting time of 10 min,and the resulting product exhibited a particle strength of 2014 N,bulk density of 890 kg/m^(3) and 1 h water absorption rate of 8.60%.(2)New phases,such as diopside,hedenbergite and wollastonite were formed during the roasting process,and that a rich porous structure was formed inside ceramsite.(3)The leaching concentrations of heavy metals(Cr,Ni,Zn,As,Cd,Pb)in ceramsite were much lower than“Integrated wastewater discharge standard”(GB 8978-1996).

关 键 词：城市生活垃圾焚烧飞灰 城市生活垃圾焚烧底渣 陶粒 重金属 

分 类 号：X799.3[环境科学与工程—环境工程] TQ174.71[化学工程—陶瓷工业]