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On the clean and efficient thermal treatment of de‐inking solid residues
Author(s) -
Kozinski Janusz A.,
Zheng Guohui,
Saade Raafat,
Di Lalla Sergio
Publication year - 1997
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450750118
Subject(s) - thermal treatment , fourier transform infrared spectroscopy , waste management , materials science , porosity , thermal , chemical engineering , environmental chemistry , chemistry , environmental science , composite material , physics , meteorology , engineering
Thermal treatment of contaminated de‐inking sludge in a low‐high‐low ( LHL ) temperature reactor was investigated. Experiments were conducted in a Cahn TGA ‐171 furnace coupled with a Mattson Galaxy 5020 FTIR. Sludge samples (70 g) were heated up to 1770 K (50 K/min.), kept at that temperature for 5 min. and were then quenched (60 K/min.). During the LHL process the sludge underwent structural transformations from a mixture of fibers, through skeleton‐like structures (45–110 μm), porous particles, to compact spheres (5–30 μm). It was shown that the LHL treatment results in a safe encapsulation of heavy metals (Pb, Cd) inside the ash and in a 78.2% decrease in the amount of mutagenic polycyclic aromatic hydrocarbons. The LHL method developed could help to solve waste management and environmental protection problems.