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主管单位 中华人民共和国
工业和信息化部
主办单位 哈尔滨工业大学 主编 冷劲松 国际刊号ISSN 0367-6234 国内刊号CN 23-1235/T

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引用本文:许鹏,赵庆良,邱微.垃圾焚烧飞灰制作碱激发砖的环境安全性评估[J].哈尔滨工业大学学报,2020,52(11):40.DOI:10.11918/201903213
XU Peng,ZHAO Qingliang,QIU Wei.Environmental safety assessment of alkali-activated bricks produced by waste incineration fly ash[J].Journal of Harbin Institute of Technology,2020,52(11):40.DOI:10.11918/201903213
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垃圾焚烧飞灰制作碱激发砖的环境安全性评估
许鹏,赵庆良,邱微
(哈尔滨工业大学 城市水资源与水环境国家重点实验室,环境学院,哈尔滨 150090)
摘要:
为探索垃圾焚烧飞灰的资源化利用,使用流化床焚烧炉产出的焚烧飞灰、燃煤飞灰及矿渣粉为主要原料,由氢氧化钠及硅酸钠调制为碱激发剂制备碱激发砖材.当焚烧飞灰最大添加比为40%时,其28 d的抗压强度达28.69 MPa,符合混凝土实心砖规范(GB/T21144—2007)要求.环境兼容性方面,28 d的垃圾焚烧飞灰碱激发砖材HJ/T 300浸出测试结果显示,重金属稳定于砖材中.长期pH相关联性浸出试验发现,砖材中重金属Ba的浸出量随pH的降低而增加;重金属Zn在pH小于7的环境下可检测到有浸出,而重金属Cd、Cr、Cu、Ni、Pb只有在pH为6以下的环境才会有浸出现象.桶槽扩散浸出试验结果显示,焚烧飞灰碱激发砖材环境稳定pH在11.0~11.5,且仅有微量重金属钡(Ba)及铬(Cr)出现释出现象,分析显示其浸出量为微量.
关键词:  碱激发砖  垃圾焚烧飞灰  抗压强度  重金属元素  渗出特性分析
DOI:10.11918/201903213
分类号:TU522
文献标识码:A
基金项目:城市水资源与水环境国家重点实验室自主课题(2019TS04)
Environmental safety assessment of alkali-activated bricks produced by waste incineration fly ash
XU Peng,ZHAO Qingliang,QIU Wei
(State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China)
Abstract:
To explore the resource utilization of waste incineration fly ash, the incineration fly ash, coal-fired fly ash, and slag powder produced by fluidized bed incinerator were selected as main raw materials, and alkali-activated bricks were prepared by using sodium hydroxide and sodium silicate as alkali activators. When the ratio of the maximum addition of incineration fly ash was 40%, the 28-day compressive strength reached 28.69 MPa, which meets the requirements of GB/T21144—2007 concrete solid bricks. In terms of environmental compatibility, the HJ/T 300 test on the 28-day alkali-activated brick produced by waste incineration fly ash shows that heavy metals were stable in the brick. Long-term pH-related leaching test reveals that the leaching amount of heavy metal Ba in the brick increased with the decrease of pH value; leaching of heavy metal Zn could be detected in the environment with pH value less than 7, and heavy metals Cd, Cr, Cu, Ni, and Pb only appeared in the environment below pH 6. Results of tank and sink diffusion dissolution test show that the alkali-activated bricks produced by incineration fly ash had an environmentally stable pH value between 11.0 and 11.5 that only heavy metals Ba and Cr appeared, and analysis shows that the leaching amount was trace.
Key words:  alkali-activated bricks  waste incineration fly ash  compressive strength  heavy metal element  exudation analysis

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