1992 Volume 78 Issue 7 Pages 1258-1265
Reduction of iron ore in a fluidized bed is limited by the agglomeration tendency of the bed particles, which causes defluidization. This defluidization is called 'Sticking phenomenon'.
In this paper, experimental studies using a batch-fluidized bed reactor are carried out to clarify the mechanism and the prevention method of sticking.
Following results are obtained.
1) Metallic iron wiskers which ore generated on the surface of iron are entangle the other particles and lead to sticking.
2) Sticking can be prevented by the carbon coating which restrains the growth of metallic iron whiskers.
3) If the metallic iron whiskers should grow, sticking can be prevented by controling the ratio of iron ore particles with wiskers below 50%.
