The utilisation of fly ash in CO2 mineral carbonation

Abstract

The fixation of CO 2 in the form of inorganic carbonates, also known as mineral carbonation, is an interesting option for the removal of carbon dioxide from various gas streams. The captured CO 2 is reacted with metal-oxide bearing materials, usually naturally occurring minerals. The alkaline industrial waste, such as fly ash can also be considered as a source of calcium or magnesium. In the present study the solubility of fly ash from conventional pulverised hard coal fired boilers, with and without desulphurisation products, and fly ash from lignite fluidised bed combustion, generated by Polish power stations was analysed. The principal objective was to assess the potential of fly ash used as a reactant in the process of mineral carbonation. Experiments were done in a 1 dm 3 reactor equipped with a heating jacket and a stirrer. The rate of dissolution in water and in acid solutions was measured at various temperatures (20 -80ºC), waste-to-solvent ratios (1:100 -1:4) and stirrer speeds (300 -1100 min -1 ). Results clearly show that fluidised lignite fly ash has the highest potential for carbonation due to its high content of free CaO and fast kinetics of dissolution, and can be employed in mineral carbonation of CO 2 .

Impact of Fly Ashes from Combustion in Fluidized Bed Boilers and Siliceous Fly Ashes on Durability of Mortars Exposed to Seawater and Carbonation Process

“…Therefore, the carbonation rate of cement-ash materials depends on many factors, including the chemical composition of the binder, the quantity and type of fly ashes used, the silicate content and the microstructure of the hardened paste. FBC fly ashes show a partial sequestration, i.e., they capture a carbon dioxide from air, which is confirmed by [17][18][19].…”

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

“…They concluded that a partial CO 2 sequestration by untreated hydrated fly ash could be an effective option for capturing and sequestration CO 2 from FBC plants with sorbent injection. Moreover, the results of Jaschik et al [177] clearly showed that FBCFA originating from lignite combustion has the highest potential for carbonation (compared with PCCFA) because of its high content of free CaO and fast kinetics of dissolution and that it can be employed in mineral carbonation of CO 2 . Moreover, Bae and Lee [176] found FBCFA to be good for capturing CO 2 .…”

Academic free speech or right-wing grievance?

“…532–534 Florida's governor has characterized such legislation as an effort to eliminate “woke gender ideology” from the curriculum. 535,536 A conservative politician with anti-LGBT views was recently selected to lead the University of Florida, 537–539 despite strident opposition from within the university. 539,540 Meanwhile, the person primarily responsible for the U.S. Republican party's anti-CRT and anti-transgender obsession 14,15 has been appointed to the Board of Trustees of a Florida liberal arts college.…”