The physicochemical properties of different biomass ash

There are no specific standards for biomass ash analysis in China. The standards for coal ash analysis are usually used to determine the property of biomass ash. Three kind of biomass including rice straw, pine sawdust and Wutong leaf were burned at 815°C, 600°C and 500°C, respectively. Corresponding to the temperature required in the standard of GB and ASTM. The ash content and composition were analyzed. Based on the ash composition results, the volatilization of alkali oxides in biomass ash, deposition and sintering problems related to biomass thermochemical conversion were analyzed. Their phase composition and morphology were investigated by XRD and SEM. Ash fusion temperature was measured by 5E-AFIISmart Ash Fusion Analyzer. The results indicated that the ash content, composition, phase composition, morphology and ash fusion temperature are closely related to ashing temperature. So it is suited to use 600°C ashing temperature for an exact determination of ash property.