Cold bonded pelletization of iron ore fines

Cold bonding processes have been developed with
a view to conserve energy in pellet hardening step.
The incorporation of the reductant and fluxes in
the pellet also ensures a blast furnace burden
that is hanogeneous with resultant smooth operations
of the furnace. The present paper deals with
the studies conducted on tha production of ccmposite
iron are pellets using iron are fines, leco char.
hydrated lime and natural silica flour as
well as rice husk silica. The results indicate
that the composite pellets with rice husk has
superior strength compared to the pellets with
natural crystalline form of silica. Studies on
CaO-HZD-rice husk silica reaction systffil revealed
that a gel like calciun silicate hydrate (CSH-I)
is formed during the steaming operation that is
responsible for the strengthaning of the composite
pellet. The studies on the kinetics of the hydrothermal
reaction revealed that the reaction is diffusion controlled and the product fanned is calcium silicate hydrate. The reducibility studies indicated good reducibility with minimun swelling.