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首页> 外文期刊>Environmental Science & Technology >Selenium Capture Using Sorbent Powders: Mechanism of Sorption by Hydrated lime
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Selenium Capture Using Sorbent Powders: Mechanism of Sorption by Hydrated lime

机译：用吸附剂粉末捕集硒：熟石灰的吸附机理

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This study investigates the potential of mineral sor-bents to capture selenium which is sufficiently volatile to occur in the flue gas in vapor state. The sorption studies are conducted in a high-temperature reactor using SeO_2 as the source of selenium. In both high (800-1000℃) and medium-temperature (400-700℃) range, hydrated lime exhibits superior selenium sorption capability compared to other sorbent powders. The results show that the mechanism of capture by Ca(OH)_2 is not a simple physical adsorption process but seems to involve a chemical reaction between CaO and SeO_2. The medium temperature range of 400-600℃ is favorable for the reaction to occur and leads to high selenium sorption. At higher temperatures, thermodynamic equilibrium aids dissociation of the reaction product, and the amount of metal capture reduces drastically with increasing temperature. XRDstudiesfurtherconfirmthatcalcium selenite is the dominant reaction product.
机译：这项研究调查了矿物吸附剂捕获硒的潜力，该硒具有足够的挥发性，可以在烟气中以蒸气状态发生。吸附研究是在高温反应器中使用SeO_2作为硒源进行的。在高温（800-1000℃）和中等温度（400-700℃）范围内，熟石灰比其他吸附剂粉末均具有优异的硒吸附能力。结果表明，Ca（OH）_2的捕获机理不是简单的物理吸附过程，而是涉及CaO和SeO_2之间的化学反应。 400-600℃的中等温度范围有利于反应的发生，并导致硒的高吸附。在较高的温度下，热力学平衡有助于反应产物的离解，并且随着温度的升高，金属捕获量急剧减少。 XRD研究进一步证实亚硒酸钙是主要的反应产物。

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