The Open Fuels & Energy Science Journal

2018, 11 : 81-90
Published online 2018 July 31. DOI: 10.2174/1876973X01811010081
Publisher ID: TOEFJ-11-81

LETTER
 Effect of CaO and FeO on Partitioning of As and S within Ash Fractions from Fluidised-Bed Co-Combustion of Coal and Wastes

Lucie Bartoňová, *

* Address correspondence to this author at the Regional Materials Science and Technology Centre, VŠB-Technical University of Ostrava, Tř. 17. listopadu 15, Ostrava – Poruba, Czech Republic, Tel: +420-59 699 1514; E-mail: lucie.bartonova@vsb.cz

ABSTRACT

Possible interaction of volatilized As and S with CaO and Fe2O3 (creating solid product) could efficiently improve coal combustion flue gas cleaning. For this reason, S-CaO, As-CaO, S- Fe2O3 and As- Fe2O3 relationships were evaluated in bottom ash and fly ash fractions from fluidised-bed co-combustion of coal and wastes (and limestone as desulphurization additive) through calculation of correlation coefficients and composition of magnetic concentrates. It was concluded that S exhibited a dominant association with CaO while As exhibited affinity to both CaO and Fe2O3 - the significance differed a little in bottom ash and fly ash. In the bottom ash, the affinity of As to CaO was more significant, while in the fly ash the association to Fe2O3 slightly prevailed.

Keywords:

Coal combustion, Sulphur, Arsenic, CaO, FeO, Flue gas cleaning, Retention.