Strength of pellets
Figure3a shows the relationship between the axial compressive strengths and the compaction pressure. The highest compressive strengths obtained were about 8.8 MPa
and were similar for pellets made with particle size
75–150lm and 150–300lm. At the same compaction
pressures, the compressive strength for pellets made with
particle size 300–425lm was evidently the lowest. A
plateau in the strength was observed at compaction pressures of approximately 190 MPa although this was not
evident for the pellets made with the largest particles. This