Significance of pressure, temperature and reaction rate events in a blast furnace simulation test

The condition of iron ore samples in blast furnace simulation rests accordi ng to the REAS procedure was determined by interrupting the test at differe nt stages close to the maximum in the pressure drop across the sample bed. While the onset of the pressure increase does agree with liquid formation ( melting of fayalite), the increase in the pressure drop appears to be relat ed to sample compaction (softening). Elimination of pores formed by reducti on (rather than lubrication by liquid) appears to be the main factor affect ing compaction. The first strong temperature arrest is not associated with melting of the slag phase, but rather with the onset of (endothermic) direc t reduction.