Selenium removal using Ca-based sorbents: reaction kinetics

Article Abstract:

A determination of the initial reaction rate and kinetic parameters of Ca-based sorbents was conducted to assess their importance in the use of the sorbents for selenium removal in combustors and boilers. Activation energy is in the magnitude of 4.03 kcal/gmol with the rate of reaction determined by the initial surface area of the sorbent. An additional finding is that the presence of SO2 decreases the reactivity between the sorbent and selenium oxide.

Blowers and fans, Air Purification Equipment Manufacturing, Dry Scrubbers, Calcium, Pollution, Scrubbers, Calcium (Chemical element)

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Mechanism of arsenic sorption by hydrated lime

Article Abstract:

Calcium hydroxide is much more effective than other mineral sorbents such as silica, kaolinite and alumina in capturing arsenic. The mechanism of the capture was investigated using hydrated lime sorbent, and it was determined that an irreversible chemical reaction occurs between arsenic and calcium hydroxide, resulting in a solid product. The capture does not occur as the result of sorption, which is the mechanism of arsenic capture using fly ash.

Ground or Treated Mineral and Earth Manufacturing, Arsenic & Compounds, Minerals, ground or treated, Fly Ash, Lime, Lime Manufacturing, Absorption, Arsenic, Calcium oxides

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Selenium capture using sorbent powders: mechanism of sorption by hydrated lime

Article Abstract:

The ability of mineral sorbents to capture selenium is investigated. The results indicated that the Ca(OH)2 capture mechanism was not a mere physical adsorption process but involved a chemical interaction between CaO and SeO2. Temperature affected the reaction and the highest degree of selenium sorption was observed between 400-600 degrees. At greater temperatures, dissociation of the reaction product was assisted by thermodynamic equilibrium.

Environmental aspects, Coal-fired power plants, Coal fired power plants, Flue gases

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