Production of Clay Coated Lightweight Fill Materials From Air Pollution Control Residues (APCR)

Book chapter

Ayati, Bamdad, Shishkin, Andrei and Newport, D. 2016. Production of Clay Coated Lightweight Fill Materials From Air Pollution Control Residues (APCR). in: International Sustainable Ecological Engineering Design for Society (SEEDS) Conference 2016 Proceedings LSIPublishing. pp. 253-263
AuthorsAyati, Bamdad, Shishkin, Andrei and Newport, D.
Abstract

Air pollution control residues (APCr) from energy-from-waste are classified as hazardous due to their
high heavy metal content and alkalinity. Recycling attempts using thermal treatment to produce a
ceramic material known as lightweight aggregate have been successful in incorporating a maximum
of 10% of APCr in the final product’s structure. The aim of this work was to increase this incorporation
by producing macro-encapsulated APCr granules with a clay coating. APCr has been washed with
deionized water, milled and mixed with different concentrations of sodium silicate to form into
granules. Sodium silicate solution was added to the mix to enhance the content of silicate and flux.
The green pellets were coated with clay and sintered in a laboratory furnace at 1150 °C. The effect
of addition of sodium silicate on particle density, water absorption and compressive strength has
been discussed. Leaching behaviour of heavy metals and soluble anions from the sintered granule
was examined according to BS EN 12457. Optical micrographs of the sintered products were
investigated to reveal the microstructure of the binding interface between APCr and clay coating.
The results showed that incorporation of up to 30% of APCr in the structure of sintered granules is
possible. The proposed clay coating technique is simple and can reduce the leaching behaviour of
hazardous waste.

Book titleInternational Sustainable Ecological Engineering Design for Society (SEEDS) Conference 2016 Proceedings
Page range253-263
Year2016
PublisherLSIPublishing
Publication dates
PrintDec 2016
Publication process dates
Deposited08 Dec 2016
EventInternational Sustainable Ecological Engineering Design for Society (SEEDS)
ISBN978-0-9955690-1-0
Web address (URL)https://www.leedsbeckett.ac.uk/as/cebe/seeds/seeds2016_proceedings.pdf
Publisher's version
License
CC BY-NC-ND
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