Physical-chemical Characterization Of
A Galvanic Sludge And Its Inertization
By Vitrification Using Container Glass
Author(s)
F. Andreola, L. Barbieri, M. Cannio, I. Lancellotti, C. Siligardi
& E. Soragni
Abstract
Several industrial processes produce large amounts of heavy metals-rich wastes,
which could be considered as \“trash-can raw materials”. The incorporation in
ceramic systems can be regarded as a key process to permanently incorporate
hazardous heavy metals in stable matrixes. In particular the aim of this work is to
prepare and evaluate environmental risk assessment of coloured glass and
glass-ceramic with the addition of chromium(III) galvanic sludge having a high
content of Cr2O3 (15.91 wt%). Trivalent chromium compounds generally have
low toxicity while hexavalent chromium is recognized by the International
Agency for Research on Cancer and by the US Toxicology Program as a
pulmonary carcinogen. The sludge has been characterized by ICP –AES
chemical analysis, powder XRD diffraction, DTA, SEM, leaching test after
different thermal treatments ranging from 400°C to 1200°C. Batch compositions
were prepared by mixing this sludge with glass containers. The glass container
composition is rich in SiO2 (69.89 wt%), Na2O (12.32 wt%) and CaO
(11.03 wt%), while the sludge has a high amount of CaO (42.90 wt%) and Cr2O3
(15.91 wt%). The vitrification was carried out at 1450°C in an electrical melting
furnace for 2 h followed by quenching in water or on graphite mould. Chromium
incorporation mechanisms, vitrification processability, effect of initial Cr
oxidation state, and product performance were investigated. In particular toxic
characterization by leaching procedure and chemical durability studies of the
glasses and glass-ceramics were used to evaluate the leaching of heavy metals (in
particular of Cr). The results indicate that all the glasses obtained were inert and
the heavy metals were immobilized.
Keywords: chromium electroplating sludge, thermal behaviour; vitrification,
chemical glass durability.
Keywords
chromium electroplating sludge, thermal behaviour; vitrification,
chemical glass durability.
Related Book
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