The fly ash produced in the process of coal combustion is actually a solid adsorbent of trace heavy metals

but many factors

such as structure and components of the fly ash

carbon content in the fly ash

and flue gas temperature etc.

have different influence upon absorption removal of the trace heavy metals. Study results show that the mechanism of absorption removal is a complicated combination of physical absorption

chemical reaction

and chemical absorption. The structure specificity and chemical components of the fly ash proper have the greatest influence upon absorption of trace elements

the flue gas temperature is also a key influencing factor

but the carbon content in fly ash only has very little influence.