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
张东帅 1王进 2岳正波 2吴建勋 3杨永浩 4詹欣源5
作者信息
- 1. 合肥工业大学资源与环境工程学院,安徽 合肥 230009
- 2. 合肥工业大学资源与环境工程学院,安徽 合肥 230009;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. 合肥工业大学资源与环境工程学院,安徽 合肥 230009;安徽省工业废水处理与资源化工程研究中心,安徽 合肥 230009;东华工程科技股份有限公司,安徽 合肥 230022
- 折叠
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2 014 N,堆积密度为890 kg/m3,1 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).
Abstract
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:(l)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 2 014 N,bulk density of 890 kg/m3 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Key words
municipal solid waste incineration fly ash/municipal solid waste incineration bottom ash/ceramsite/heavy metals引用本文复制引用
基金项目
国家自然科学基金青年科学基金(52100139)
安徽省博士后研究人员科研活动资助项目(2022B593)
中央高校基本科研业务费专项(JZ2023HGTB0266)
出版年
2024
NETL
NSTL
维普
万方数据