Abstract
As a dangerous environmental pollutant, mercury is widely existed in coal-fired power plant gases. In this manuscript, a novel and reliable high-capacity adsorbent (MagFeSi-Cu°) was synthesized by powder metallurgy method to remove Hg° from flue gases. The FeSi, the nano-copper and the silica-coated magnetic Fe3O4 nanoparticles were mixed and calcinated at 300 °C by powder metallurgy method. Copper nanoparticles were uniformly dispersed on the FeSi surface by the linkage of Cu3Si, which was formed by the interfacial reaction between surface Cu atoms in the copper nanoparticles and the amorphous Si on the surface of FeSi. Due to the magnetic properties of the Fe3O4 nanoparticles, the adsorbent can be effectively separated from dust waste for further recycling and regeneration. The amorphous silicon in ferrosilicon (FeSi) reacts with copper nanoparticles, producing copper-silicon alloy as a binder to maintain the stability of copper nanoparticles. Besides that, well-dispersed copper nanoparticles prepared by liquid phase reduction have excellent amalgam properties. The characteristics mentioned above make the new composite (MagFeSi-Cu°) a regenerable sorbents for Hg° Removal from flue gas, which was confirmed by mercury removal test conducted in a fix-bed reactor.
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