| 冶金尘泥混合垃圾燃烧飞灰熔融重构固化重金属的研究 |
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| 引用本文： | 高志芳,龙红明,春铁军,余正伟,刘海涛,高海潮,侯三亚. 冶金尘泥混合垃圾燃烧飞灰熔融重构固化重金属的研究[J]. 环境科学学报, 2018, 38(7): 2721-2727 |
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| 作者姓名： | 高志芳 龙红明 春铁军 余正伟 刘海涛 高海潮 侯三亚 |
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| 作者单位： | 安徽工业大学冶金工程学院;冶金减排与资源综合利用教育部重点实验室(安徽工业大学) |
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| 基金项目： | 国家自然科学基金委员会-宝钢集团有限公司钢铁联合研究基金（No.U1660106） |
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| 摘 要： | 针对冶金固废组分复杂且难以高附加值利用的特性,结合当前垃圾燃烧飞灰重金属污染现状,通过将两者混合进行熔融固化及成分重组,研究了重金属固化及浸出毒性.结果表明:随着温度升高,固化渣出现明显结块,且燃烧过程中矿物发生重组,Zn、Cu、Pb和Cr取代硅酸盐中Ca~(2+)、Al~(3+)等离子而被固熔于网状基体中,生成了Cu_6Zn_4Al_2O_4、FeCr_2O_4、Cd_(0.75)Zn_(0.25)Fe_2O_4、Zn(AlO0.5Fe1.5)O4、MgCr0.4Fe1.6O4及Cu0.5Zn0.5Fe2O4等物质;且随着温度升高,Ca-Fe-Si-O体系形成一种耐热硅酸盐稳定相CaFe_3(SiO_4)2OH,由于其覆盖或包裹住含有重金属的晶体,从而延缓并阻止了灰渣分解及重金属的浸出,降低了重金属对环境的污染.
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| 关 键 词： | 冶金尘泥 垃圾飞灰 熔融重构 重金属固化 浸出毒性 |
| 收稿时间： | 2017-11-29 |
| 修稿时间： | 2018-02-01 |
Solidification of toxic heavy metals in municipal solid waste and incineration (MSWI) fly ash with melting metallurgical dust |
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| GAO Zhifang,LONG Hongming,CHUN Tiejun,YU Zhengwei,LIU Haitao,GAO Haichao and HOU Sanya. Solidification of toxic heavy metals in municipal solid waste and incineration (MSWI) fly ash with melting metallurgical dust[J]. Acta Scientiae Circumstantiae, 2018, 38(7): 2721-2727 |
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| Authors: | GAO Zhifang LONG Hongming CHUN Tiejun YU Zhengwei LIU Haitao GAO Haichao HOU Sanya |
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| Affiliation: | 1. School of Metallurgy Engineering, Anhui University of Technology, Maanshan 243002;2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling(Anhui University of Technology), Ministry of Education, Maanshan 243002,1. School of Metallurgy Engineering, Anhui University of Technology, Maanshan 243002;2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling(Anhui University of Technology), Ministry of Education, Maanshan 243002,School of Metallurgy Engineering, Anhui University of Technology, Maanshan 243002,School of Metallurgy Engineering, Anhui University of Technology, Maanshan 243002,School of Metallurgy Engineering, Anhui University of Technology, Maanshan 243002,School of Metallurgy Engineering, Anhui University of Technology, Maanshan 243002 and School of Metallurgy Engineering, Anhui University of Technology, Maanshan 243002 |
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| Abstract: | In view of the low value characteristics for complex components of metallurgy solid waste, combined with the present situation of heavy metal pollution of fly ash from MSW fly ash, the solidification and leaching toxicity of heavy metals were studied by mixing metallurgical dust, and the results showed that the curing slag was significantly agglomerated and the mineral was recombined with the temperature increasing during the combustion process. Ca2+ and A13+ plasmas in the silicate were substituted by Zn, Cu, Pb and Cr in the matrix to produce Cu6Zn4Al2O4, FeCr2O4, Cd0.75Zn0.25Fe2O4, Zn(AlO0.5Fe1.5)O4, MgCr0.4Fe1.6O4, Cu0.5Zn0.5Fe2O4 and other substances. Ca-Fe-Si-O was converted to a heat-resistant silicate stable phase CaFe3(SiO4)2OH with the increasing temperature. The encapsulate phase of heavy metals was covered by CaFe3(SiO4)2OH to delay and prevent the decomposition of ash and leaching of heavy metals which reduced the heavy metal environmental pollution. |
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| Keywords: | MSW fly ash metallurgical dust melting reconstruction heavy metal solidification leaching toxicity |
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