Transformations In The Solid And Liquid Phase
At Aqueous Carbonization Of Oil Shale Ash
Author(s)
M. Uibu, A. Trikkel & R. Kuusik
Abstract
The oil shale based energy sector of the Republic of Estonia is related to huge
waste flows - about 5 million tons of waste ash is landfilled annually by
circulating in the system tens of millions of cubic meters of transportation water
saturated with different salts. Due to the distinctiveness of oil shale, the waste
ash is characterized by heterogeneous and complicated mineral composition. Ash
contains, depending on combustion technology (currently both pulverized firing
and circulated fluidized bed combustion are used), 10–20% of free lime as the
most active compound. Contacting free lime with water leads to elevated pH
values (pH>13) and makes landfilling of this ash by hydraulic transportation
highly problematic. It has been shown that the negative environmental impact of
high alkalinity of these flows could be equilibrated by using CO2 from flue gases
as a neutralizing agent. At the same time the emission of CO2 is diminished.
Laboratory batch tests showed that by treating ash – water suspension with
CO2-containing flue gases, the most of the free CaO can be reduced to an
acceptable level. Some aspects of processes deceleration during wet
carbonization of ash have been elaborated. Part of the free CaO present is not
accessible due to low porosity and the formation of reaction products on the
surface of ash particles. Also, lowering the pH of carbonized ash suspension
influences the composition of the liquid phase by increasing leaching of some of
the ash components. The behaviour of CaSO4 as one of the dominant
Ca-compounds in ash has been elaborated.
Keywords: CO2 mineralization, waste oil shale ash.
Keywords
CO2 mineralization, waste oil shale ash.
Related Book
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