Effect of B2O3 on the melting characteristics of model municipal solid waste incineration (MSWI) fly ash. (1st January 2021)

• Record Type: Journal Article
• Authors: Gao, Jing; Dong, Changqing; Zhao, Ying; Xing, Tong; Hu, Xiaoying; Wang, Xiaoqiang
• Is Part Of: Fuel. Volume 283(2021)
• Publication Date: 2021-01-01
• Subjects: B2O3 -- MSWI fly ash -- Thermochemistry -- Boron minerals -- Melting; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.119278
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: The temperature at which particles agglomerate decreased. The reactions of boron in ash melting process were elucidated. The formation of Ca11 B2 Si4 O22, Ca2 B2 O5 and CaB2 O4 decreased melting temperature. The role refractory melilite decreased on the influence of B2 O3 . Abstract: This paper presents the melting characteristics of the multicomponent system of CaO-SiO2 -Al2 O3 -Fe2 O3 -MgO under the influence of B2 O3 . Experiments on modelled ash fusibility were conducted in which mixtures of SiO2, Al2 O3, CaO, Fe2 O3, MgO, and B2 O3 were investigated using a high-temperature stage microscope (HTSM) and ash fusion temperature (AFT) test. Thermodynamic calculations combined with X-ray diffraction (XRD) were used to obtain the reaction mechanisms that contributed to the melting process. The results showed that the temperature at which the particles agglomerated and melted decreased as the B2 O3 content increased. B2 O3 decreased the melting temperatures of the model ash samples, which could be related to the formation of the minerals Ca11 B2 Si4 O22, Ca2 B2 O5, and CaB2 O4 as well as the decrease of refractory minerals such as melilite.