Fig. 3 shows the sinter degree of wood–straw pellets produced
with different fractions of straw and mineral additives. Wood–
straw pellets with a straw ratio of more than 50 wt.% are strongly
sintered at 1000 C. The sinter behavior is slightly improved with a
increased wood ratio of more than 70 wt.%. These results demonstrate
that addition of wood to straw has a very poor effect on sinter
behavior. This poor sinter behavior of wood/straw pellets was
expected since straw ash is known to melt at temperatures of
940 C [26] due to the building of alkali silicates with low melting
temperatures