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Removal of mercury in aqueous solution by fluidized bed plant fly ash

机译：用流化床植物粉煤灰去除水溶液中的汞

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摘要

Coal combustion in power plant produces fly ash. Fly ash may be used in water treatment to remove mercury (Hg~(2+)) from water or to immobilize mercury mobile forms in silts and soils. Experiments were carried out on two kinds of fly ashes produced by two circulating fluidized bed plants with different chemical composition: silico-aluminous fly ashes and sulfo-calcic fly ashes. For the two kinds of fly ashes, adsorption equilibrium were reached in 3 days. Furthermore, removal of mercury was increased with increasing pH. Sulfo-calcic fly ashes allow us to remove mercury more efficiently and more steady. The chemical analysis of fly ash surface was carried out by electron spectroscopy. The results show that mercury is bound to ash surface thanks to several chemical reactions between mercury and various oxides (silicon, aluminium and calcium silicate) of the surface of the ashes.
机译：电厂中的煤炭燃烧会产生粉煤灰。粉煤灰可用于水处理，以从水中去除汞（Hg〜（2+））或将可移动的汞固定在淤泥和土壤中。对两种具有不同化学成分的循环流化床工厂生产的两种粉煤灰进行了实验：硅铝粉煤灰和磺化钙粉煤灰。对于这两种粉煤灰，在3天内达到了吸附平衡。此外，汞的去除随着pH值的增加而增加。含钙的飞灰使我们能够更有效，更稳定地去除汞。粉煤灰表面的化学分析通过电子光谱进行。结果表明，由于汞与灰烬表面的各种氧化物（硅，铝和硅酸钙）之间发生了几种化学反应，汞被束缚在灰烬表面。

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