A METHOD FOR THE REMOVAL OF MERCURY FROM A STREAM OF FLUE GAS OBTAINED FROM THE COMBUSTION OF COAL AND A SORBENT-MIXTURE

摘要

A method for the removal of mercury from a stream of flue gas obtained from the combustion of at least one coal, said method comprising the step of introducing a kaolin- or metakaolin-comprising sorbent into said stream of flue gas for removing mercury from said stream of flue gas and contacting the mercury with the kaolin or metakaolin-comprising sorbent in the presence of active free silica, wherein further to the introduction of the kaolin- or metakaolin-comprising sorbent into said stream of flue gas a source of active free silica is introduced so as to increase the active free silica content of the flue gas resulting from the combustion by the introduction of additional free silica, wherein the flue gas has a temperature of at least 900°C and preferably >1000°C at the point where the kaolin or metakaolin-comprising sorbent is introduced.