Transformations Of Sulfur Compounds In
Oil Shale Ash Suspension
Author(s)
K. Tamm, R. Kuusik, M. Uibu & J. Kallas
Abstract
Oil shale (sulfur content <2%) is mainly used for the production of electricity
and heat in Estonia. Calcium-rich waste formed in the process of oil shale
combustion can be used as sorbents in the CO2 mineralisation process. CaSO4 is
the main sulfur compound in the ashes of oil shale, but traces of sulfides are also
found. This means that transformations of sulfur compounds in the water
environment must be considered while using hydrotransport and open air
deposition of oil shale ash as well as treating alkaline ash transportation waters.
The transformations of sulfur compounds in model systems (ash – water and CaS
– water) were studied in anaerobic and aerobic conditions as well as in the
process of aqueous carbonization. The separation of poisonous H2S(g) was
continuously monitored. The results revealed that the leachates of oil shale ash
contained mainly sulfates in both aerobic and anaerobic conditions but sulfides
and sulfites were also present. Small amount of H2S(g) was emitted already in
the first minutes of carbonation process at high pH region (~12). The alkalinity
decreased during carbonation of ash – water suspensions, triggering substantial
H2S release at pH<9 (the content of H2S(g) in off-gas reached to 110 ppm).
Taking environmental issues into consideration, the critical pH value of the
aqueous carbonation system of oil shale ash must be optimized in order to
minimize the separation of gaseous H2S emissions.
Keywords: calcium sulfide, oil shale ash, mineral carbonisation, H2S.
1 Introduction
Considering the importance of energetic safety, a local low-calorific fossil fuel
oil shale (sulfur content 1–2%), is used for heat power production in the
Keywords
calcium sulfide, oil shale ash, mineral carbonisation, H2S.
Related Book
Other papers in this volume
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