重金属在水泥窑协同处置的净浆硬化体中的分布及形态
收稿日期: 2021-11-12
网络出版日期: 2022-08-11
基金资助
国家重点研究发展计划(2016YFB0600504);河北省自然科学基金(B2017202246);教育部创新团队发展计划(IRT14R14);河北省现代海洋化工技术协同创新中心(冀教科[2013]37号┫泉州市科技计划项目┣2019C109)
Distribution and speciation of heavy metals in hardened solid of net slurry co?disposed by cement kiln
Received date: 2021-11-12
Online published: 2022-08-11
通过欧共体标准物质局(European Community Bureau of Reference)提出的一种三级4步提取法(BCR),分析了垃圾焚烧飞灰和经水泥窑协同处置的净浆硬化体中重金属的分布和形态。探究了随水化反应的进行,其重金属形态转化的趋势。结果表明,重金属主要分布在氢氧化钙、水化硅酸钙(C-S-H)、钙矾石(AFt)和未水化的水泥熟料中。随着水化反应的进行,Zn、Cu、Cr、Cd和Mn皆有向迁移能力较强的形态转化的趋势,其中Cr和Cd的转化趋势较为明显。与垃圾焚烧飞灰相比,重金属通过水泥窑高温煅烧和水化反应,其迁移能力较强的形态占比明显减少。
雷鸣 , 朱含钰 , 刘子龙 , 陈国蓬 , 袁俊生 . 重金属在水泥窑协同处置的净浆硬化体中的分布及形态[J]. 无机盐工业, 2022 , 54(8) : 107 -113 . DOI: 10.19964/j.issn.1006-4990.2021-0687
A three?stage four?step extraction method(BCR) proposed by European Community Bureau of Reference.The distribution and speciation of heavy metals in the hardened solids of waste incineration fly ash and net slurry co?disposed by cement kiln were analyzed.The trend of speciation transformation of heavy metals with hydration reaction was studied.The results showed that the heavy metals were mainly distributed in Ca(OH)2,calcium silicate hydrate(C-S-H),ettringite(AFt) and unhydrated cement clinker.As the hydration reaction going on,Zn,Cu,Cr,Cd and Mn all had a tendency to transform into forms with strong migration ability,among which Cr and Cd had an obvious tendency.Compared with fly ash from MSW incineration,the proportion of heavy metals with strong migration ability decreased significantly after calcination and hydration in cement kiln.
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