Transformation and Migration Mechanism of Nitrogen-Containing Substances in Process of Co-Treatment of Papermaking Sludge

doi:10.16552/j.cnki.issn1001-1625.2024.1468

Abstract

Abstract: Under the dual carbon goals, coordinated governance of air pollution is the key to promoting the comprehensive green transformation of industry. Papermaking sludge undergoes complex physical and chemical transformations during the coordinated disposal of industrial kilns, producing NO_x and other pollution. Exploring the generation mechanism of NO_x in the process of coordinated disposal of papermaking sludge by industrial kilns and analyzing the form and migration characteristics of its nitrogen-containing functional groups can provide new ideas for controlling NO_x pollution emissions. In this paper, the transformation and migration of nitrogen-containing functional groups in papermaking sludge and pyrolysis at different temperatures were analyzed by means of nuclear magnetic resonance (NMR) analysis and gradient temperature inversion method. The results show that the release of nitrogen-containing functional groups is mainly concentrated in the temperature range of 250 ℃ to 300 ℃. From 200 ℃ to 250 ℃, imine and R₃C—N=, RCH₂—N= are released; from 250 ℃ to 300 ℃, thiourea, R₂CH—N=, RCH₂—N=, R₃C—N= are released; from 300 ℃ to 350 ℃, CH₃—N=, carbodiimide and cyanate are released; from 350 ℃ to 400 ℃, thiocyanate, isocyanate and CH₃—N= are released. TGA/DSC curve analysis further confirm the release of these functional groups, providing a reference for further environmental governance and process optimization.

Key words: papermaking sludge, nitrogen-containing functional group, gradient temperature back-calculation method, sludge treatment, nuclear magnetic resonance analysis

CLC Number:

X793

LIU Zuhao, YANG Kang, LI Hui. Transformation and Migration Mechanism of Nitrogen-Containing Substances in Process of Co-Treatment of Papermaking Sludge[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(4): 1574-1582.

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