Study of loss-on-ignition anomalies found in ashes from combustion of iron-rich coal.

Vandenberghe, Robert EmileResende, Valdirene Gonzaga deCosta, Geraldo Magela daGrave, Eddy De2013-01-282013-01-282010VANDENBERGHE, R. E. et al. Study of loss-on-ignition anomalies found in ashes from combustion of iron-rich coal. Fuel, v. 89, p. 2405-2410, 2010. Disponível em: <https://www.sciencedirect.com/science/article/pii/S001623611000030X>. Acesso em: 28 jan. 2013.00162361http://www.repositorio.ufop.br/handle/123456789/2080Samples of a fly and a bottom ash, each before and after ignition at 960 _C, have been studied by X-ray diffraction, Mössbauer spectroscopy, carbon analysis, and thermogravimetric analysis with the aim to explain an observed negative loss on ignition. Ashes after ignition contain more maghemite resulting from oxidation of newly formed magnetite. Moreover, the fly ash that already contained magnetite exhibited an increase of hematite after ignition. Hercynite present in both ashes transforms to hematite and magnetite after the ignition. All these oxidation processes are responsible for a weight gain which may compensate the loss due to the burning of the remaining carbon in the ashes. Also, a-Fe is formed after ignition which may have originated from wustite.en-USFly ashBottom ashLoss on ignitionMössbauer spectroscopyStudy of loss-on-ignition anomalies found in ashes from combustion of iron-rich coal.Artigo publicado em periodicoO periódico Fuel concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3313110432955.