Characterization of Ca(OH)2/fly ash sorbents for flue gas desulfurization

Lin, Ren-Bin; Shih, Shin‐Min

doi:10.1016/s0032-5910(03)00003-2

Cited by 31 publications

(27 citation statements)

References 23 publications

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“…Ma and Brown (1997) also found CaCO 3 , mullite, and SiO 2 after hydration of class F fly ash and Ca(OH) 2 and were unable to confirm the presence of calcium hydrate silicates by X-ray diffraction because the main peak was , 1997), no significant changes were found in the X-ray diffraction pattern for 5=3 sorbents at 3 and 48 h of hydration, indicating that the amount of crystalline compounds formed was too small to be detected. The same result was found by Lin et al (2003b) working under the same conditions. The main application of this technique was to follow the evolution of the peaks of the raw material.…”

Section: Resultssupporting

confidence: 87%

Hydrothermal Reaction of Fly Ash/Hydrated Lime: Characterization of the Reaction Products

Fernández

Renedo

2006

Chemical Engineering Communications

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Class F coal fly ash was slurried with hydrated lime at 90 C in 1=3, 5=3, 9=3, and 15=3 weight ratios and for 3, 5, 7, and 9 hours of hydration, in a process to prepare sorbents for SO 2 removal. The amounts of aluminum, silicon, and calcium in the product of the pozzolanic reaction were determined in order to study the evolution of product composition with the initial raw materials ratio and hydration time and to relate this composition to the desulfurization capability of the material. Al, Si, and Ca were present in the solid product for any raw materials ratio and hydration time, showing that calcium silicates, calcium aluminates, and=or calcium aluminum silicates were obtained simultaneously. The products formed show a nearly constant molar ratio of Al 2 O 3 =SiO 2 independent of the experimental conditions tested and similar to the Al 2 O 3 =SiO 2 ratio in the fly ash. The SiO 2 =CaO molar ratio in the products decreased as the initial fly ash=Ca(OH) 2 ratio decreased, being approximately constant for each ratio with respect to hydration time after 5 hours of hydration. The maximum moles of CaO, SiO 2 , and Al 2 O 3 per gram of sorbent in the reaction product were found for any hydration time for the 5=3 sorbents, meaning that at this initial ratio the pozzolanic reaction takes place at the highest rate. The capacity of the sorbent for SO 2 removal depends not only on the amount of products produced by the pozzolanic reaction but also on the specific surface area of the sorbent.

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Section: Resultssupporting

confidence: 87%

Hydrothermal Reaction of Fly Ash/Hydrated Lime: Characterization of the Reaction Products

Fernández

Renedo

2006

Chemical Engineering Communications

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“…Illcrystallized tobermorited include C-S-H(I), C-S-H(II), and tobermorite gel [25]. Under our experimental conditions, C-S-H(I) is the major product, which is similar with the CSHs phase formed in the HL-silica sorbents prepared by other researchers [26,27]. Fig.…”

Section: Characterization Of Sorbentssupporting

confidence: 74%

Preparation of a new sorbent with hydrated lime and blast furnace slag for phosphorus removal from aqueous solution

Gong

Tian

et al. 2009

Journal of Hazardous Materials

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“…Mullite, formed by SiO 2 reacting with Al 2 O 3 at high temperature of 1200-1650 • C in a boiler of the power plant, has very stable crystalline structure. The X-ray diffraction pattern also shows a mild hump ranging from 20 • to 25 • , characterizing the existence of amorphous alumina and silica with higher activity [12,13]. The fly ash contains both quartz and amorphous silica.…”

Section: Xrd Analysesmentioning

confidence: 97%