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Migration, solidification/stabilization mechanism of heavy metal in lightweight ceramisite from co-sintering fly ash and electrolytic manganese residue
Process Safety and Environmental Protection ( IF 7.8 ) Pub Date : 2023-03-21 , DOI: 10.1016/j.psep.2023.03.047
Xinyuan Zhan, Yan Wang, Li’ao Wang, Chenxuan Li, Xiaowei Xu, Rui Deng

Municipal solid waste incineration (MSWI) fly ash and electrolytic manganese residue, as hazardous waste, were roasted into lightweight ceramisite with coal fly ash. The migration, transformation and stabilization/solidification mechanism of heavy metals during ceramisite formation process was explored. Heavy metals in ceramisite pellet were concentrated and experienced the transportation among solids below 710 ℃, then heavy metals were prone to flue gas in the form of chlorides above 710 ℃, in particular for Pb, Cd and Cu. Heavy metal chlorides depended on the generation of HCl and Cl2, which needs co-existence of silicon oxide and aluminum oxide. Note that gibbs free energy change of copper chlorides generation reaction decreased with temperature, resulting in higher volatilization rate compared with Mn, Zn and Cr. Remained heavy metals in the solid phase like Cu, Zn and Cr were prone to ion-exchange, balance-charge and specific-adsorb with calcium-bearing minerals (Ca(Mg,Al)(Si,Al)2O6 and (Ca,Fe)SiO3) in ceramisite based on mineral analysis and principle component analysis at 1160 ℃.



中文翻译:

粉煤灰与电解锰渣共烧轻质陶粒中重金属的迁移固化稳定机理

城市固体垃圾焚烧(MSWI)飞灰和电解锰渣作为危险废物,与粉煤灰一起焙烧成轻质陶粒。探讨了重金属在陶粒形成过程中的迁移、转化和稳定/凝固机制。陶粒球团中的重金属在710℃以下发生富集并在固体间迁移,710℃以上重金属易以氯化物的形式排放到烟气中,尤其是Pb、Cd和Cu。重金属氯化物依赖于HCl和Cl 2的产生,这需要氧化硅和氧化铝共存。请注意,氯化铜生成反应的吉布斯自由能变化随温度降低,导致与 Mn、Zn 和 Cr 相比挥发率更高。残留在固相中的Cu、Zn、Cr等重金属易与含钙矿物(Ca(Mg,Al)(Si,Al) 2 O 6( Ca ,Fe)SiO 3 )基于1160℃矿物分析和主成分分析陶粒。

更新日期:2023-03-24
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