Study of the pyrolysis of construction waste containing urea-formaldehyde resins
Urea-formaldehyde resin is an excellent adhesive with a wide range of applications in the field of building materials.Traditional disposal methods are difficult to effectively dis-pose of building waste containing urea-formaldehyde resin.In this paper,the pyrolysis method was innovatively proposed to treat urea-formaldehyde resin waste.The reaction be-havior and pyrolysis gas-phase products of urea-formaldehyde resin pyrolysis were systemati-cally analyzed by thermogravimetric infrared coupling(TG-FTIR)system,which provided theoretical basis and data support for urea-formaldehyde resin pyrolysis treatment.The re-sults show that the pyrolysis of urea-formaldehyde resin is mainly divided into two stages:the volatilization of water and additives and the cracking of resin,and the second stage plays the main role.At 900℃,the cumulative gas production rate of UF1(bulk urea-formalde-hyde resin)was 32.6%higher than that of UF2(granular urea-formaldehyde resin),and the cumulative gas production rate increased little with the increase in temperature from 600 to 900℃.The reaction order of urea-formaldehyde resin pyrolysis was determined to be 1.4 by the Coats-Redfern method,and the activation energy of UF1 was slightly higher than that of UF2.FTIR analysis shows that the gas-phase products of urea-formaldehyde resin crack-ing are mainly CO2,H2 O and compounds containing C-H bonds,N-H bonds and carbonyl groups.The nitrogen element is mainly in the form of nitrogen-hydrogen compounds rather than in the form of highly polluting nitrogen oxides.
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万方数据
维普
