Fate of mercury in flue gas desulfurization gypsum determined by Temperature Programmed Decomposition and Sequential Chemical Extraction

Palygorskite is widely used as industrial adsorbent and also potential for flue gas desulfurization by adsorption of SO2. The effect of thermal treatment on Palygorskite’s structural properties and its performance in SO2adsorption were investigated. The textural and structural properties of the prepared palygorskite adsorbent were characterized by X-ray diffraction, transmission electron microscopy and temperature programmed desorption. The result showed the channel of Palygorskite is partial collapsed and the structure is not changed ultimately when thermally treated below 300 °C. The structure of Palygorskite is Gradually changed when the treating temperature is higher than 300 °C and is damaged entirety till 800 °C. As a result, the adsorption capacity of SO2on Palygorskite decreased drastically. It is suggested that the presences of surface adorbed water and zeolitic water which occupy a large number of adsorption sites are disadvantage for the adsorption of SO2, and dissimilarly the presence of crystal-bonded water is favorable.

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Study of the Mercury Sorption Mechanism on Activated Carbon in Coal Combustion Flue Gas by the Temperature-Programmed Decomposition Desorption Technique

Energy & Fuels ◽

10.1021/ef100288f ◽

2010 ◽

Vol 24 (8) ◽

pp. 4241-4249 ◽

Cited By ~ 22

Author(s):

Atsushi Murakami ◽

Md. Azhar Uddin ◽

Ryota Ochiai ◽

Eiji Sasaoka ◽

Shengji Wu

Keyword(s):

Activated Carbon ◽

Flue Gas ◽

Coal Combustion ◽

Sorption Mechanism ◽

Temperature Programmed ◽

Temperature Programmed Decomposition

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Removal of Hg, As in FGD gypsum by different aqueous ammonia (amines) during CO2 sequestration

Waste Management & Research ◽

10.1177/0734242x17733540 ◽

2017 ◽

Vol 35 (12) ◽

pp. 1296-1301 ◽

Cited By ~ 1

Author(s):

Tan Wenyi ◽

Fan Wenhui ◽

Li Hongyi ◽

Zhang Zixin ◽

Zhu Yunkun

Keyword(s):

Elevated Temperatures ◽

Aqueous Ammonia ◽

Flue Gas Desulfurization ◽

Chemical Extraction ◽

The Novel ◽

Fgd Gypsum ◽

Novel Technology ◽

Sequential Chemical Extraction ◽

Removal Efficiencies ◽

First Time

CO2 sequestration by flue gas desulfurization gypsum (FGDG) has become a promising FGDG disposal technology due to simultaneous CO2 emission reduction and FGDG conversion into calcium carbonate. In this paper, another merit of the novel technology, i.e., the removal of toxic elements (e.g., Hg and As) in FGDG, will be addressed for the first time. In three different aqueous ammonia (or amines) media, removal efficiencies of Hg and As in FGDG samples were evaluated during CO2 sequestration. Higher than 90% and 20% removal efficiencies, respectively, for Hg and As are achieved at 40°C in aqueous ammonia media, but they decrease at elevated temperatures. Ammonia loss takes place at 80°C and pH varies greatly with temperatures in aqueous ammonia. This is disadvantageous for the formation of Hg–ammonia complexes and for the yield of carbonates, which are responsible for Hg or As re-adsorption. The sequential chemical extraction method suggests that the speciation changes of Hg are induced by FGDG carbonation, and that unstable Hg speciation in triethanolamine increases at elevated temperatures.

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URANUS 52N

Alloy Digest ◽

10.31399/asm.ad.ss0566 ◽

1994 ◽

Vol 43 (5) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

High Temperature ◽

Flue Gas ◽

Crevice Corrosion ◽

Heat Treating ◽

Flue Gas Desulfurization ◽

Temperature Performance ◽

Aisi Type ◽

Better Than

Abstract URANUS 52N is a nitrogen-alloyed duplex stainless steel improved in stress-corrosion cracking resistance and with pitting and crevice corrosion resistance better than AISI Type 317L. Applications include handling phosphoric acid contaminated with chlorides and in flue gas desulfurization scrubbers. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-566. Producer or source: Creusot-Marrel.

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AL 4565 ALLOY

Alloy Digest ◽

10.31399/asm.ad.ss0906 ◽

2004 ◽

Vol 53 (8) ◽

Keyword(s):

Fracture Toughness ◽

Corrosion Resistance ◽

High Temperature ◽

High Resistance ◽

Flue Gas ◽

Heat Treating ◽

Flue Gas Desulfurization ◽

High Nitrogen ◽

Temperature Performance ◽

High Level

Abstract AL 4565 alloy has a high level of austenitizers, which provides the microstructure with a high resistance to sigma formation during welding. The high nitrogen also gives the alloy superior strength among the austenitics. Applications include flue gas desulfurization and handling seawater. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as heat treating and joining. Filing Code: SS-906. Producer or source: Allegheny Ludlum Corporation.

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