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Accelerated carbonation of different size fractions of bottom ash from RDF incineration

pmid: 20045306
handle: 20.500.14243/239868 , 2108/10208 , 11573/227597
This paper investigates the effects of accelerated carbonation on the characteristics of bottom ash from refuse derived fuel (RDF) incineration, in terms of CO(2) uptake, heavy metal leaching and mineralogy of different particle size fractions. Accelerated aqueous carbonation batch experiments were performed to assess the influence of operating parameters (temperature, CO(2) pressure and L/S ratio) on reaction kinetics. Pressure was found to be the most relevant parameter affecting the carbonation yield. This was also found to be largely dependent on the specific BA fraction treated, with CO(2) uptakes ranging from approximately 4% for the coarse fractions to approximately 14% for the finest one. Carbonation affected both the mineralogical characteristics of bottom ash, with the appearance of neo-formation minerals, and the leaching behaviour of the material, which was found to be mainly related to the change upon carbonation in the natural pH of the ash.
- National Research Council Italy
- Roma Tre University Italy
- Roma Tre University Italy
- University of Rome Tor Vergata Italy
- Sapienza University of Rome Italy
Waste Products, MANAGEMENT; RESIDUES, Settore ICAR/03 - INGEGNERIA SANITARIA - AMBIENTALE, Incineration, Carbon Dioxide, CAPACITY, SOLID-WASTE INCINERATOR, Kinetics, Metals, Heavy, Particle Size, BEHAVIOR
Waste Products, MANAGEMENT; RESIDUES, Settore ICAR/03 - INGEGNERIA SANITARIA - AMBIENTALE, Incineration, Carbon Dioxide, CAPACITY, SOLID-WASTE INCINERATOR, Kinetics, Metals, Heavy, Particle Size, BEHAVIOR
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