Due to high content of alkali metals

especially potassium

the biomass will cause serious slagging on the equipment surfaces if were burned.The laterite

containing large amount of Si and Al

which is distributed widely in southern China and can be obtained easily

can be employed to capture the alkali metals during biomass combustion

thus to inhibit the slagging and coagulation of the alkali metals and the high temperature melting ashes.The occurrence and migration behavior of K during biomass combustion and the effects of laterite on this process were experimentally investigated.The results show that

the mechanism of laterite affecting the potassium's transformation was the same as that of kaolin

and the effectness was also similar.Therefore

laterite is a good slagging inhibitor.During the biomass combustion

when a little amount of laterite was added

the water-soluble K tended to change into aluminosilicates

like KAlSiO4

KAlSi2O6

KAlSi3O8

and others.Thus

the release of gaseous potassium decreased.In this change

the potassium's reactions were the same as that in pure biomass burning

and were promoted.