Transformation of trace metals Cu and Pb during high temperature flue gas pyrolysis of waste tires
Waste tires(WT),as a common solid waste,can cause great pollution to the environment if it is disposed unreasonably.In this paper,coal-fired high-temperature flue gas for pyrolysis of WT was used,focusing on the release characteristics of heavy metals Cu and Pb during the pyrolysis process,and the control effects of different metal oxides(CaO,MgO,Al2O3,Fe2O3)on two heavy metals.In addition,the effect of adding PVC on the migration release of two heavy metals was also investigated.The results showed that when the pyrolysis time was 10min,the two elements had been basically released completely.The enrichment of Cu was promoted at high temperature,while the release of Cu was promoted at low temperature.Metal oxides had a controlling role in the release of two elements.MgO promoted the enrichment of Cu,while Al2O3 promoted the enrichment of Pb.When WT with added polyvinyl chloride(PVC)was pyrolyzed,the enrichment of Cu was promoted at low temperature while the release of Cu was promoted at high temperature.However,regardless of the temperature,the addition of PVC resulted in almost complete release of Pb.Furthermore,Fe2O3 inhibited the release of both heavy metals.
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维普
