AI Article Synopsis
- The study examines how the properties of limestones affect their reactivity and the release of mercury under wet scrubber conditions.
- Smaller particle size, higher porosity, and lower magnesium content of limestones result in increased reactivity, leading to more effective mercury capture.
- While sulphite ions do not trigger mercury re-emission, iron-rich limestones facilitate mercury release in low oxygen, and low pH levels help capture mercury by preventing Fe(2+) formation.
Article Abstract
This work evaluates the influence of the effect of the properties of limestones on their reactivity and the re-emission of mercury under typical wet scrubber conditions. The influence of the composition, particle size, and porosity of limestones on their reactivity and the effect of sorbent concentration, pH, redox potential, and the sulphite and iron content of the slurry on Hg(0) re-emission was assessed. A small particle size, a high porosity and a low magnesium content increased the high reactivity of the limestones. Moreover, it was found that the higher the reactivity of the sample the greater the amount of mercury captured in the scrubber. Although sulphite ions did not cause the re-emission of mercury from the suspensions of the gypsums, the limestones enriched in iron increased Hg(0) re-emission under low oxygen conditions. It was observed that the low pH values of the gypsum suspensions favored the cocapture of mercury because Fe(2+) formation was avoided. The partitioning of the mercury in the byproducts of the scrubber depended on the impurities of the limestones rather than on their particle size. No leaching of mercury from the gypsum samples occurred suggesting that mercury was either tightly bound to the impurities of the limestone or was transformed into insoluble mercury species.
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| http://dx.doi.org/10.1021/es304090e | DOI Listing |
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