translate English to French: Singer (1981) in Chapter 3, presents the following mechanism for the formation of alkali pyrosulphates: during combustion, pyrite and organic sulphur in the fuel are oxidized to Fe2 O3 , SO2 and SO3 . Concurrently, alkalis in the clay and shale oxidize to Na2 O and K2O.
Ces composés réagissent ensuite avec SO3 dans le flux gazeux ou après s’être déposés pour former les sulfates correspondants.