The effects of calcination temperature

time and additives on the alkali content of coal-cinder from the catalytic gasification of pulverized anthracite were examined by using the static calcination method in a laboratory high temperature furnace in this study.The results indicated that the optimum calcination temperature and time were respectively 870℃and 30 min

and the optimum dealkalization additive is kaolinite.By adding only 5% kaolinite in the calcination process

the dealkalization rate could be increased to 100%.Most importantly

with analyzing the calcined cinder by X-ray powder diffraction (XRD) and scanning electron microscope(SEM)

it was clear that at an appropriate calcination temperature

the activated SiO2 and Al2O3 in alkaline coal-cinder would react with the decomposed fused Na2CO3 to form a new neutral matter nepheline（NaAlSiO4）and other amorphous silicate compounds

causing an obvious reduction of the alkali content in coal-cinder.