Decomposition of calcium sulfate:  a review of the literature.

Swift, W.M.; Panek, A.F.; Smith, G.W.; Vogel, G.J.; Jonke, A.A.

doi:10.2172/7224692

Cited by 32 publications

(23 citation statements)

References 12 publications

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“…CaSO 3 •½H 2 O was the unique desulfurization product clearly identified. CaSO 4 was not identified by TG-MS as MS peaks of SO 3 were not found, probably due to the decomposition of the calcium sulfate at elevated temperatures to form CaO, SO 2 and O 2 according to bibliography [18]. CaCO 3 is the main product of CO 2 capture and CaO•CO 2 , another product.…”

Section: Reaction Process and Products Identificationmentioning

confidence: 99%

Sulfation and Carbonation Competition in the Treatment of Flue Gas from a Coal-Based Power Plant by Calcium Hydroxide

Fernández

Renedo

2015

International Journal of Chemical Reactor Engineering

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In this work, a gas containing CO2 and SO2 at the usual concentrations on the coal combustion flue gas reacted with calcium hydroxide to evaluate and quantify the influence of SO2 on the CO2 capture and vice versa. This influence was quantified with a continuous gas analyzer and by thermogravimetry (TG). Results show that the CO2 retained increases in general as its concentration does and decreases as the SO2 concentration increases. A similar behavior was found for the SO2 retention at different CO2 concentrations being more relevant the influence of the presence of SO2 on the CO2 capture than the opposite one. Results suggest that for a high CO2 capture, SO2 should be eliminated previously. With respect to the reaction process it was found that the desulfurization product clearly identified was CaSO3·½H2O; in the reaction between Ca(OH)2 and CO2, CaCO3 is mainly obtained, the complex CaO·CO2 being another possible product synthesized in low amount. Gas analyzer shows that SO2 and CO2 react simultaneously and that a part of the CaCO3 reacts with the SO2 and releases CO2. Sulfation values calculated by TG and from the gas analyzer are very similar but the amount of CO2 captured is not possible to know clearly by TG due to the synthesis and decomposition of CaCO3 during the process. The study of the evolution of the sorbent porosity in the process reveals that the presence of both acid gases produces a lower blockage of the pores than when only one gas is present probably due to the generation of new pores in the reaction of CaCO3 and SO2.

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Section: Reaction Process and Products Identificationmentioning

confidence: 99%

Sulfation and Carbonation Competition in the Treatment of Flue Gas from a Coal-Based Power Plant by Calcium Hydroxide

Fernández

Renedo

2015

International Journal of Chemical Reactor Engineering

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“…Thermal decomposition of CaSO4 in air occurs only at high temperatures (1200-1250 o C) by reaction R-13 [29]:…”

Section: Calcium Sulphate Thermal Decompositionmentioning

confidence: 99%

Qualitative and quantitative characterization of a coal power plant waste by TG/DSC/MS, XRF and XRD

Fernández

González

Pesquera

et al. 2016

J Therm Anal Calorim

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SO2 removal from coal-fired power plant flue gases can be done by dry, semi-dry or wet desulfurization processes, using limestone or lime containing products as sorbents. In a Brazilian coal power plant there is a dry desulfurization unit to capture SO2 with hydrated lime from the combustion gases. A part of the flying ashes produced is mixed with the bottom coal ashes and the spent sulphated product generated after SO2 capture. This residual solid blend is then buried in a non-productive area, from which coal was already extracted and is studied in this work. According to the authors experience in development and characterization of adsorbents for low temperature dry desulfurization processes and in Thermogravimetric Analysis, this paper shows and discusses a method which was developed to characterize qualitative and quantitatively the chemical and mineral composition of this waste by using Thermogravimetry coupled with mass spectrometry (TG/MS), X-ray fluorescence (XRF) and X-ray diffraction (XRD), to preview new potential industrial applications for this waste.

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“…By following the conditions suggested by Rassiwalla and Wheelock (1977), Wheelock and Morris (Morris, 1984;Wheelock and Morris, 1986;Morris et al, 1987) Laboratory (Swift et al, 1976). These studies can be divided into two different applications.…”

Section: Recent Development Of the Two-zone Systemmentioning

confidence: 99%

“…were required to produce appreciable levels of sulfur dioxide (greater than 7%) by thermal decomposition (Swift et al, 1976). The reaction was also very slow and sensitive to the reaction atmosphere.…”

Section: Information To Usersmentioning

confidence: 99%

The kinetics of the reductive decomposition of calcium sulfate with carbon monoxide

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Decomposition of calcium sulfate: a review of the literature.

Cited by 32 publications

References 12 publications

Sulfation and Carbonation Competition in the Treatment of Flue Gas from a Coal-Based Power Plant by Calcium Hydroxide

Sulfation and Carbonation Competition in the Treatment of Flue Gas from a Coal-Based Power Plant by Calcium Hydroxide

Qualitative and quantitative characterization of a coal power plant waste by TG/DSC/MS, XRF and XRD

The kinetics of the reductive decomposition of calcium sulfate with carbon monoxide

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