Dissolution kinetics of South African coal fly ash and the development of a semi-empirical model to predict dissolution
2014
Wet flue gas desulphurization (FGD) is a crucial technology which can be used
to abate the emission of sulphur dioxide in coal power plants. The
dissolution of coal fly ash in adipic acid is investigated by varying acid
concentration (0.05-0.15M), particle size (45- 150μm), pH (5.5-7.0),
temperature (318-363K) and solid to liquid ratio (5-15 wt %.) over a period
of 60 minutes which is a crucial step in wet (FGD). Characterization of the
sorbent was done using X-ray fluorescence (XRF), X-ray diffraction (XRD),
Furrier transform infrared (FTIR), scanning electron microscope (SEM) and
Branauer-Emmett-Teller (BET) surface area. BET surface area results showed an
increase in the specific surface area and SEM observation indicated a porous
structure was formed after dissolution. The experimental data was analyzed
using the shrinking core model and the diffusion through the product layer
was found to be the rate limiting step. The activation energy for the process
was calculated to be 10.64kJ/mol.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
1
References
3
Citations
NaN
KQI